Relevant bibliographies by topics / Methanolic ligand solution / Journal articles

To see the other types of publications on this topic, follow the link: Methanolic ligand solution.

Journal articles on the topic 'Methanolic ligand solution'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Methanolic ligand solution.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

FARAH MUAIAD IBRAHIM. "Synthesis and Characterization of Fe (II), Co (II), Ni (II), Cu (II), Cd (II) Mono-Complexes with Mannich Base 4- hydroxy- 3-(4'-morpholinyl methyl) quinoline." Journal of the College of Basic Education 18, no. 74 (2023): 83–94. http://dx.doi.org/10.35950/cbej.v18i74.9687.

Full text

Abstract:

Mannich bases have rececived great attention in recent years because of their proven antimalarial, antifungal and anticancer activities, coordination certain metal ions to them have interested use in synthesizing and studying structural aspects of metal complexes with oxygen and nitrogen donor ligands. The chelate ligand 4-hydroxy-3-(4'-morpholinyl methyl) quinoline was prepared by condensation of the formaldehyde with morpholine and 4- hydroxyquinoline in ethanol. A methanolic solution of the prepared ligand was reacted with a methanolic solution containing metal ions Fe (II), Co (II), Ni (II), Cu (II), Cd (II) to give metal complexes. The reaction of Fe (II), Co (II), Ni (II), Cd (II) ions with chelate ligand gave the mono-nuclear tetrahedral complexes, and mono-nuclear square planar complex with Cu (II). Their molecular structures were studied by FTIR, 1H-NMR and UV-Visible spectra, atomic absorption technique, elemental analysis have been performed using CHN, magnetic susceptibility and conductivity measurements.

APA, Harvard, Vancouver, ISO, and other styles

Adiba, Naila Azmi, Danar Purwonugroho, Arie Srihardyastutie, and Yuniar Ponco Prananto. "Crystallization of [Zn(Pyrazinamide)₂(Cl)₂] Complex and In Vitro Antibacterial Activity of the Complex Against E. coli and S. aureus." Jurnal Kimia Sains dan Aplikasi 27, no. 9 (2024): 436–43. http://dx.doi.org/10.14710/jksa.27.9.436-443.

Full text

Abstract:

A complex of [Zn(pza)2(Cl)2], pza = pyrazinamide, was successfully crystallized from methanol or ethanol solvents with different morphology. The complex was synthesized using the solution method in ZnCl2: pza mol ratios of 1:2 and 1:4 in both ethanol and methanol solvents. FTIR and single crystal XRD analyses were done to confirm the complex. The complex was then used for in vitro antibacterial test against E. coli and S. aureus. Experimental data shows that the type of solvent and metal-to-ligand mol ratio yields the same compound, resulting in colorless crystals that melt at 234-236°C. Large block crystals were obtained from the methanolic solution, while a higher yield was obtained from the use of a higher mol ratio of 1:4. Infrared spectra analysis confirms the presence of characteristic carbonyl and amide groups of the pza ligand. Meanwhile, single crystal XRD screening indicates that unit cell parameters of the crystals from both solvents are identical to a known zinc(II)-pza complex. In vitro antibacterial tests against E. coli and S. aureus show that the complex had much better activity than the ZnCl2 and the free pza. In addition, the complex performs better antibacterial activity toward gram-positive S. aureus than the gram-negative E. coli.

APA, Harvard, Vancouver, ISO, and other styles

Saleem, Mohd, and Mohd Riaz. "Synthesis of some Novel Mixed Ligand Complexes of Ni(II) and their Characterization." Oriental Journal Of Chemistry 37, no. 5 (2021): 1152–57. http://dx.doi.org/10.13005/ojc/370520.

Full text

Abstract:

A new series of metal Complexes were prepared by refluxing nickel chloride with hot methanolic solution mixture of 8-Hydroxyquinoline and Schiff bases(L1-L6). Schiff base ligands were synthesised by the condensation of 4-aminopheno, 4-aminosalicylic acid, 2-aminobenzthiazole with salicylaldehyde and vanillin. The metal complexes have been characterised by gravimetric metal analysis, magnetic moment,conductivity measurement, 1HNMR and IR analysis.

APA, Harvard, Vancouver, ISO, and other styles

Sarkar, Asit R., and Shipra Mandal. "Insulin Mimetic Peroxo Complexes of Vanadium Containing Uracil or Cytosine as Ligand." Metal-Based Drugs 7, no. 3 (2000): 157–64. http://dx.doi.org/10.1155/mbd.2000.157.

Full text

Abstract:

Mixed ligand oxo peroxo complexes of vanadium (V), M[VO(O2)L2].nH2O where M = K or NH4, HL = uracil or cytosine and n = 1 or 2, have been isolated from aqueous methanolic medium. The complexes were characterised by elemental analysis, conductance, TGA, UV-Visible, IR and NMR spectral studies. Both the peroxide and the other ligands acts as chelates coordinating through their oxygen at C (2) and nitrogen at N (3) and the presence of monomeric oxoperoxovanadium (V) species, have been established by IR, H1 and V51 NMR studies. The complexes appeared to possess pentagonal bipyramidal geometry. The terminal oxo ligand and the oxygen of the uracil or cytosine at C (2) occupy the axial position while the peroxide and the other donor ligands are in the equatorial position. The UV spectral studies confirm the presence of Vanadium in its +5 oxidation state. The administration of the potassium salts of the complexes reduces the blood glucose level in Swiss Albino mice compared to that of KVO3. The complexes also readily oxidise cysteine to Cystine in aqueous solution. The possible mechanism for the insulin-mimic activity of the complexes is discussed.

APA, Harvard, Vancouver, ISO, and other styles

Herberhold, Max, Guo-Xin Jin, Walter Kremnitz, Arnold L. Rheingold та Brian S. Haggerty. "Halfsandwich cyclo-Pentasulfido and cyclo-Pentaselenido Complexes, (η5-C5Me5)M(NO)(E5) (E = S, Se; M = Cr, Mo, W)". Zeitschrift für Naturforschung B 46, № 4 (1991): 500–506. http://dx.doi.org/10.1515/znb-1991-0413.

Full text

Abstract:

The reactions of the pentamethylcyclopentadienyl halfsandwich nitrosyl complexes Cp*Cr(NO)2I and Cp*M(NO)I2 (M = Mo, W) with either methanolic ammonium polysulfide solutions or hydrogen selenide solutions (generated by hydrolysis of Al2Se3) can be used to prepare cyc/o-pentachalcogenido compounds such as Cp*M(NO)(S5) (M = Cr (la), Mo (2a), W (3a)) and Cp*M(NO)(Se5) (M = Cr (lb), W (3b)). The chromium complex Cp*Cr(NO)(S5) (la) is also formed in high yield by photodecarbonylation of Cp*Cr(CO)2NO in acetonitrile solution in the presence of excess sulfur. An X-ray structure analysis of Cp*W(NO)(S5) (3 a) revealed a cyclo-S5 chelate ligand in the chair conformation and an almost linear nitrosyl group.

APA, Harvard, Vancouver, ISO, and other styles

Khrabit, Taleb M. "Synthesis and spectral studies of some metal complexes derived from 1,3,4-oxadiazole and Evaluated of biological activity." Al-Mustansiriyah Journal of Science 29, no. 4 (2019): 73. http://dx.doi.org/10.23851/mjs.v29i4.415.

Full text

Abstract:

In this study we reports the preparation and characterization of ligand [L1] [2,5-bis(4-butoxy phenyl) -1,3,4- oxadiazole in four steps. First from (4-hydroxy benzoic acid) treated with solution of potassium hydroxide and normal bromo alkane (RBr) R=[(CH3(CH2)3] to prepared precursor [ H1] 4-( butyloxy) benzoic acid. The second step have been prepared the precursor [H2]4-( butyloxy) benzoate from compound [H1] in methanolic acidic solution with drops of H2SO4 . The third step prepared the precursor [H3] 4-(n-butoxy) benzo hydrazide by the reaction [H2] and hydrazine hydrate(90%). The last step reaction between precursor [H1] and [H3] in present of POCls to obtained ligand [L1]. The primary ligand [L1] was characterized by Fourier transform infrared spectraFT-IR,1H-NMR,13C-NMR,Termal Gravimetric analysis (UV-Vis) spectrophotometer, Mass spectroscopy and elemental microanalysis (C-H-N) and melting point .The secondary ligand benzyl (propane-2-yl) carbamodithioate (S-bpth) was prepared according to the litreture (13). The Ag(L1) complex was prepared from 2 mole of L1 and one mole of AgNO3 in CH2Cl2 solvent at inert condition. The complexes Ni(II), Pd(II), Pt(II), Cu(II) and Zn(II) were synthesized from the two mole of primary ligand(L1 ) and one mole secondary ligand (S-bpth) with one m mole of metal chloride in ethanol medium and characterized comprehensively by Fourier transform infrared spectra(FT-IR), (UV-Vis) spectrophotometer, elemental microanalysis (C.H.N) metal analysis, Atomic absorption spectrophotometer

APA, Harvard, Vancouver, ISO, and other styles

Kis, Máté Levente, Bálint Hajdu, Petar Dorkov, Ivayla Pantcheva, and Béla Gyurcsik. "Circular Dichroism Spectroscopic Studies on Solution Chemistry of M(II)-Monensinates in Their Competition Reactions." Inorganics 11, no. 8 (2023): 334. http://dx.doi.org/10.3390/inorganics11080334.

Full text

Abstract:

The chirality of the polyether ionophore monensic acid A can be successfully used to study its coordination ability in solution. A complementary approach to gain new insights into the complexation chemistry of the antibiotic (studied previously by circular dichroism (CD) spectroscopy in the ultraviolet range (UV-CD)) is presented. (1) Methods: The CD spectroscopy in the visible (VIS-CD) and near-infrared (NIR-CD) range is applied to evaluate the affinity of deprotonated monensic acid A (monensinate A) towards Ni(II) or Co(II) cations in methanolic solution. Competition experiments between a variety of colorless divalent metal ions for binding the ligand anion were also performed. (2) Results: The stability constants of the species observed in binary Ni(II)/Co(II)-monensinate systems and their distribution were reevaluated with the VIS- and NIR-CD techniques. The data confirmed the formation of mono and bis complexes depending on the metal-to-ligand molar ratio. The studies on the systems containing two competing divalent metal cations exclude the formation of ternary complex species but provide an opportunity to also calculate the stability constants of Zn(II), Mg(II), and Ca(II) monensinates. (3) Conclusions: The advantages of CD spectroscopy in the VIS-NIR range (“invisible” ligand and metal salts, “visible” chiral complex species) simplify the experimental dataset evaluation and increase the reliability of computed results.

APA, Harvard, Vancouver, ISO, and other styles

Diop, Aboubacar, Tidiane Diop, Daouda Ndoye, Dame Seye, Paul Tinnemans, and Cheikh Diop. "Synthesis, Spectroscopic Studies, Thermal Stability and Crystal Structure of New Bidentate Schiff Base and Its Cadmium Complex." Science Journal of Chemistry 12, no. 6 (2024): 135–43. https://doi.org/10.11648/j.sjc.20241206.13.

Full text

Abstract:

A new asymmetric bidentate Schiff base ligand was synthesized from a condensation reaction between 2,4-dichlorobenzaldehyde (C7H4Cl2O) and 1,3-pentanediamine (C5H14N2). A cadmium complex was prepared by adding Cd(II) iodide dissolved in methanol to a methanolic solution of the Schiff base ligand, in a ratio of 1:1. The ligand was characterized by elemental, spectroscopic (IR, &lt;sup&gt;1&lt;/sup&gt;H NMR), and thermogravimetric analyses. The ligand structure, thermally very stable, is revealed to be bidentate with two potential N-donor sites. The crystal structure of the Schiff base was elucidated by X-ray diffraction analysis. Compound crystallizes in a monoclinic system with a space group P21/n and a number of units per unit cell Z = 4. The unit cell parameters are: a =7.3885(2), b =16.9332 (4), c = 15.5624(4), and β = 90.4306(10). In the asymmetric unit of the ligand, the benzene rings C08/C10/C09/C11/C21/C17 and C20/C15/C13/C18/C22/C24 are in trans position with the aliphatic group with respect to the bonds (C07-N05) and (C19-N06), respectively. In addition, these two aromatic rings are located in two different planes, forming an angle of 3.60º between them, given that the dihedral angle between the ring C08/C10/C09/C11/C21/C17 and the aliphatic group N05-N06 is 67.49º. The spectroscopic data of the complex reveals a mononuclear complex where the Cd(II) ion is housed in a N2I2 coordination site with a slightly distorted tetrahedral geometry. The conductance data indicate that the complex is a neutral electrolyte.

APA, Harvard, Vancouver, ISO, and other styles

Sarker, Pranta, Avijit Chakraborty, Saswata Rabi, et al. "Noncyclic Diaza Ligands and Their Metal Complexes: Synthesis, Characterization, and Biological Studies." Asian Journal of Chemistry 35, no. 12 (2023): 3027–36. http://dx.doi.org/10.14233/ajchem.2023.30567.

Full text

Abstract:

Condensation reactions involving various ketones and amines formed noncyclic ligands denoted as LI, LII, LIII, and LIV. Ethylenediamine, when reacted with acetophenone, benzoylacetone (in the presence of 70% HClO4), and benzophenone, resulted in the following noncyclic ligands: (E,E)-N,N-bis(1-phenylethylidene)ethylenediamine (LI), bis(1-3-hydroxy-3-phenylbut-2-ene-ylidene) (LII) and (E,E)-N,N-bis(1,1-diphenylmethylidene)ethylenediamine (LIII), respectively. The reaction of benzophenone with 1,3-diaminopropane in a 1:1 ratio in a methanolic solution also led to the synthesis of a noncyclic ligand, (E,E)-N,N-bis(1,1-diphenylmethylidene)propylenediamine (LIV). All the synthesized noncyclic ligands, except LII, undergo decomposition during complexation, reverting to the initial ketones and amines. In contrast, LII exhibits remarkable stability and can form square planar complexes with Ni(II), Cu(II), and Co(II) salts. Additionally, the Co(II) complex can convert into a six-coordinated Co(III) complex, [CoLII(H2O)2](NCS), when it reacts with KNCS. All these ligands and derived metal complexes were characterized, and their antimicrobial properties were evaluated against the selected fungi and bacteria.

APA, Harvard, Vancouver, ISO, and other styles

Barta Holló, Berta, Mirjana M. Radanović, Marko V. Rodić, Sanja Krstić, Željko K. Jaćimović, and Ljiljana S. Vojinović Ješić. "Synthesis, Physicochemical, Thermal and Antioxidative Properties of Zn(II) Coordination Compounds with Pyrazole-Type Ligand." Inorganics 10, no. 2 (2022): 20. http://dx.doi.org/10.3390/inorganics10020020.

Full text

Abstract:

The reactions of pyrazole derivative, i.e., ethyl-5-amino-1-methyl-1H-pyrazole-4-carboxylate (L) with zinc halogenides in methanolic solution and zinc nitrate and zinc acetate in acetonic solution are described. The formulae of synthesized compounds are ZnL2Cl2 (1), [ZnL2Br2] (2), ZnL2I2·0.5MeOH (3), [Zn(L)2(H2O)4](NO3)2 (4), and {ZnL(OAc)2}2 (5). Two complexes are obtained in form of single crystals: [ZnL2Br2] (2) and [Zn(L)2(H2O)4](NO3)2 (4). Their crystal and molecular structure were determined by single-crystal X-ray structure analysis. The FTIR spectra of compounds prove the complex formation with all five zinc salts. The complexes are characterized by conductometric and thermoanalytical measurements, and their antioxidative activity was also tested by the scavenging effect on the DPPH radical. Conductometric results, solvolytic stability, and antioxidative activity of the compounds are in correlation.

APA, Harvard, Vancouver, ISO, and other styles

Radanović, Mirjana, Marijana Kostić, Berta Barta Holló, Ljiljana Vojinović-Ješić, and Vukadin Leovac. "SYNTHESIS AND STRUCTURE OF A Cr(III) COMPLEX WITH 2,6-DIACETYLPYRIDINE-BIS(PHENYLHYDRAZONE)." Journal of Chemists, Technologists and Environmentalists 5, no. 1 (2024): 32–35. https://doi.org/10.59919/jcte05202401006.

Full text

Abstract:

&lt;p&gt;Knowledge of the coordination chemistry of 2,6-diacetylpyridine-bis(phenylhydrazone) (L) is limited, and this compound seems promising in many fields. We explored the reaction of methanolic solutions of chromium(III) nitrate and L in a 1:1 molar ratio and obtained the thin red crystals of the complex. It was characterized by FTIR, elemental analysis, and molar conductivity. Comparing the ligand and the complex spectra confirmed that coordination has occurred through azomethine and pyridine nitrogen atoms. Molar conductivity of DMF solution indicates that the complex is an electrolyte of the type 1:1. The chromium(III) is most likely situated in an octahedral environment of six nitrogen atoms of the two ligand anions, viz. [Cr(L&amp;ndash;H)&lt;sub&gt;2&lt;/sub&gt;]NO&lt;sub&gt;3&lt;/sub&gt;.&amp;nbsp;These findings enable the further investigation of the complex properties. Besides, future research will explore the impact of changing synthetic conditions on the reaction product and their characterization.&amp;nbsp;&lt;/p&gt;

APA, Harvard, Vancouver, ISO, and other styles

Chaudhary, Simran, Renny Maria Losus, and Liliana Dobrzańska. "Polymorphism and the Phenomenon of Whole-Molecule Disorder Revealed in a Novel Dipodal Thiopyridine Ligand." Crystals 15, no. 4 (2025): 289. https://doi.org/10.3390/cryst15040289.

Full text

Abstract:

We report two polymorphs (α and β) of a novel bipodal ligand, 1,4-bis(thiopyridine)benzene, which were isolated from the same methanolic solution. Single-crystal X-ray analyses revealed the phenomenon of positional whole-molecule disorder occurring in form α, which comes down to packing disorder. Computational calculations were carried out to compare the crystal lattice energies of the isolated polymorphs. The energetically more stable form β has a higher packing efficiency and shows an increased number of hydrogen bonds compared with both components of form α, the packing of which is dominated by van der Waals interactions. Supportive bulk studies, such as thermal analysis and powder X-ray diffraction, were also performed.

APA, Harvard, Vancouver, ISO, and other styles

Leovac, Vukadin, Vladimir Divjakovic, Valerija Cesljevic, and Refik Fazlic. "Transition metal complexes with thiosemicarbazide-based ligand: Part 45 - Synthesis, crystal and molecular structure of [2, 6-diacetylpyridine bis(S-methylisothiosemicarbazonato)]diazide-iron(III)." Journal of the Serbian Chemical Society 68, no. 4-5 (2003): 425–33. http://dx.doi.org/10.2298/jsc0305425l.

Full text

Abstract:

The template reaction of a warm methanolic solution of FeCl3.6H2O S-methylisothiosemicarbazidehydroiodide and 2,6-diacetylpyridine in the presence of LiOAc and NaN3 yielded the high-spin complex [Fe(HL)(N3)2], were HL is the monoanion of the ligand 2,6-diacetylpyridine bis(S-methylisothiosemicarbazone). X-Ray analysis of the complex showed its pentagonal-bipyramidal configuration, with pentadenate (N5) HL in the equatorial plane and two monodentate azide groups in the axial positions. Crystal data are: monoclinic, P21/c,a=1.0263(2), b = 1.2525(2), c = 1.6660(3) nm, ?= 98.94?, V = 2.1154 nm3, Z = 4, ?x = 1.499 g cm-3, ?0 = 1.48 g cm-3, F(000) = 984, ?= 9.40 cm-1.

APA, Harvard, Vancouver, ISO, and other styles

Finisia, Yenni, Siti Mutrofin, and Yuniar Ponco Prananto. "Anion Effect and Ligand Preference in the Precipitation of Ni(II) Complex from Methanolic Solution: Case of Tartrate vs Pyrazine." Journal of Pure and Applied Chemistry Research 11, no. 2 (2022): 128–35. http://dx.doi.org/10.21776/ub.jpacr.2022.011.02.670.

Full text

Abstract:

This research aims to incorporate pyrazine in the synthesis of Ni(II)-tartrate-pyrazine metal organic frameworks or Ni(II)-T-P MOF as candidate of porous material. Synthesis of the targeted MOF was conducted at room temperature in a methanolic solution by mixing Ni(II) solution, L-tartaric acid (T), and pyrazine (P) solutions sequentially in various molar ratios (Ni(II):T:P = 1:1:0; 1:0:2; 1:2:2; and 1:2:4) using two different Ni(II) salts (chloride and nitrate). Solid products were characterized by infrared spectroscopy, qualitative anion identification test, melting point test, and scanning electron microscopy. The result shows that type of nickel salt affects the precipitation of Ni(II) complex, in which pale blue solids were precipitated out only from the chloride reactions (1:0:2, 1:2:2, and 1:2:4). IR and SEM analyses from the 1:2:2 and 1:2:4 reactions show identical result as also shown by the 1:0:2 reaction, whereas qualitative anion identification test result suggests that the chloride is uncoordinated to the Ni(II). The targeted Ni(II)-T-P is unsuccessfully obtained, instead the product is proposed to be [Ni(pyrazine)x(H2O)(6-x)]Cl2. although the tartaric acid was doubled and firstly reacted with the Ni(II), the pyrazine still has higher preference to coordinate to the Ni(II) center than the tartrate ligand.

APA, Harvard, Vancouver, ISO, and other styles

Kumar, Dinesh, and Amit Kumar. "Syntheses, Characterization, and Biological Activities of Metal Complexes of N-(2-Carbamoylthienyl)-C-(3′-carboxy-2′-hydroxyphenyl) Azetidin-2-one with Some Di-, Tetra-, and Hexavalent Metal Ions." Journal of Chemistry 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/124790.

Full text

Abstract:

The cyclization of the Schiff base, N-(2-carbamoylthienyl)-3′-carboxy-2′-hydroxybenzylideneimine with ClCH2COCl in dioxane, in the presence of triethylamine (Et3N) forms N-(2-carbamoylthienyl)-C-(3′-carboxy-2′-hydroxyphenyl) azetidin-2-one, LH3(I). A methanolic solution ofIreacts with Co(II), Cu(II), Zn(II), Zr(OH)2(IV), and MoO2(VI) ions and forms the coordination compounds, [Co(LH)(MeOH)]2(II), [Cu(LH)]2(III), [Zn(LH)(MeOH)2] (IV), [Zr(OH)2(LH)(MeOH)] (V), and [MoO2(LH)(MeOH)2] (VI). The compounds have been characterized on the basis of elemental analyses, molar conductance, molecular weight, spectral (IR, NMR, reflectance, and ESR) studies, and magnetic susceptibility measurements. All the coordination compounds are nonelectrolytes (ΛM=3.1-9.2 mho cm2mol−1) in DMF.Ibehaves as a dibasic tridentate OON donor ligand inV; a dibasic tetradentate OONO donor ligand inII,III, andVI; and a dibasic tetradentate OONS donor ligand inIV.IIandIIIare dimers, while others are monomers in diphenyl.IIIexhibits subnormal magnetic moment (1.55 B.M.) and is involved in antiferromagnetic exchange, while the other complexes are magnetically dilute. A square-pyramidal structure forIIIand an octahedral structure forII,IV, andVare suggested.VIexhibits an eight-coordinate structure. The ligand (I) and its compounds show antibacterial activities towardsE. coli(gram negative) andS. aureus(gram positive).

APA, Harvard, Vancouver, ISO, and other styles

Abram, Ulrich, Sonja Abram, Wolfgang Hiller, et al. "Synthesis, Characterization and Crystal Structure of {N-(2-Mercaptoacetyl)-N′-[4-(pentene-3-one-2)]ethane-1,2-diaminato } oxotechnetium(V)." Zeitschrift für Naturforschung B 46, no. 4 (1991): 453–58. http://dx.doi.org/10.1515/znb-1991-0406.

Full text

Abstract:

{ N-(2-Mercaptoacetyl)-N′-[4-(pentene-3-one-2)]ethane-1,2-diaminato} oxotechnetium(V) has been prepared by the reaction of (Bu4N)TcOX4 complexes (X = Cl, Br) with N-(mercaptoacetyl)-N′-[4-(pentene-3-one-2)]ethane-1,2-diamine in methanolic solution. The compound forms dark red crystals which were characterized by elemental analysis, IR and 1H NMR spectroscopy, mass spectrometry, as well as an X-ray structure determination. The compound crystallizes triclinic in the centrosymmetric space group PĪ with a = 776.50(3), b = 819.69(6), c = 1040.43(7) pm, α = 92.944(6)°, β = 110.805(5)° and γ = 109.957(5)°. The final R value is 0.023. In the monomeric complex the five coordinate technetium atom exhibits a square pyramidal environment with the donors of the tetradentate ligand in the basal plane and the oxo ligand in the apical position. The bond length Tc–O = 165.7(2) is within the normal range of Tc=O double bonds.

APA, Harvard, Vancouver, ISO, and other styles

Khalil, Mutasim Ibrahim, Aisha Mohamed Al-Zahem, and Maha Hamad Al-Qunaibit. "Synthesis, Characterization, Mössbauer Parameters, and Antitumor Activity of Fe(III) Curcumin Complex." Bioinorganic Chemistry and Applications 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/982423.

Full text

Abstract:

Curcumin-Fe(III) complex was prepared from Fe(NO3)3·9H2O precursor and curcumin by refluxing a slightly basic methanolic solution of their mixture with the objective of investigating its cytotoxicity. The enol form of curcumin ligand was established by FTIR, UV/Vis,1H NMR, and13C NMR spectroscopy. The as-prepared product was characterized by elemental analysis, FTIR, UV, and Mössbauer spectroscopic techniques. An octahedral high-spin Fe(III) complex was obtained,δ, 0.37 mms−1; Q.S., 0.79 mms−1; no magnetic relaxation was observed at liquid N2temperature, neither reduction of Fe(III). The tested cytotoxicity of the as-prepared complex on four cancer cell lines indicated inhibition of the curcumin activity upon complexing with iron.

APA, Harvard, Vancouver, ISO, and other styles

Bütje, K., and W. Preetz. "Darstellung und Redoxverhalten aller bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV), [Os(NCS)n(SCN)6-n]3-/2-, n = 0—6, einschließlich der Stereoisomeren / Preparation and Electrochemical Behaviour of All Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV), [Os(NCS)n(SCN)6-n]3-/2-, n = 0—6, Including Stereoisomers." Zeitschrift für Naturforschung B 43, no. 4 (1988): 382–88. http://dx.doi.org/10.1515/znb-1988-0402.

Full text

Abstract:

AbstractThe first two complete series of all 10 possible linkage and geometric isomers of the general formula [Os(NCS)n(SCN)6-n]3-/2- have been obtained. The Os(III) complexes, some of which have been previously known, are prepared from the reactions of K2[OsX6], X = Cl. Br. I, and K2[OsO2(OH)4] with excess aqueous or methanolic KSCN solution and subsequent chromatographic separation on DEAE cellulose. Oxidation with Ce(IV) in acetone or methanol yields the corresponding Os(IV) compounds without changes in the ligand sphere except for n = 0, but pure salts of [Os(SCN)6]2“ are isolated by repeated recrystallization. S-bonding is less favoured in Os(IV) than in Os(III), proving that Os(IV) is the harder Lewis acid. Cyclic voltammograms of all isomers show two waves, a mainly irreversible Os(II)/Os(III) couple and a reversible Os(III)/Os(IV) couple. Characteristic shifts of the half-wave potentials of both electron transfer reactions within the series give strong evidence of π-back donation to -NCS.

APA, Harvard, Vancouver, ISO, and other styles

Sundaresan, Sriram, Irina Kühne, Conor Kelly, et al. "Anion Influence on Spin State in Two Novel Fe(III) Compounds: [Fe(5F-sal2333)]X." Crystals 9, no. 1 (2018): 19. http://dx.doi.org/10.3390/cryst9010019.

Full text

Abstract:

Structural and magnetic data on two iron (III) complexes with a hexadentate Schiff base chelating ligand and Cl− or BPh4− counterions are reported. In the solid state, the Cl− complex [Fe(5F-sal2333)]Cl, 1, is high spin between 5–300 K while the BPh4− analogue [Fe(5F-sal2333)]BPh4, 2, is low spin between 5–250 K, with onset of a gradual and incomplete spin crossover on warming to room temperature. Structural investigation reveals different orientations of the hydrogen atoms on the secondary amine donors in the two salts of the [Fe(5F-sal2333)]+ cation: high spin complex [Fe(5F-sal2333)]Cl, 1, crystallizes with non-meso orientations while the spin crossover complex [Fe(5F-sal2333)]BPh4, 2, crystallizes with a combination of meso and non-meso orientations disordered over one crystallographic site. Variable temperature electronic absorption spectroscopy of methanolic solutions of 1 and 2 suggests that both are capable of spin state switching in the solution.

APA, Harvard, Vancouver, ISO, and other styles

Leovac, Vukadin, Vladimir Divjakovic, Valerija Cesljevic, and Milena Rakocevic. "Transition metal complexes with thiosemicarbazide-based ligands. Part 51. Square-planer nickel(II)complex with acetylacetone bis(S-n-propylisothiosemicarbazone)(L).Crystal and molecular structure of [." Journal of the Serbian Chemical Society 71, no. 6 (2006): 593–604. http://dx.doi.org/10.2298/jsc0606593l.

Full text

Abstract:

The template reaction of a warm methanolic solution of Ni(OAc)2?4H2O S-n-propylisothiosemicarbazide hydroiodide and acetylacetone yielded the needle- like, brown, diamagnetic complex [Ni(L-H)]I?MeOH, and in the presence of an excess of NH 4NCS, brown, prismatic crystals of the complex [Ni(L-H)]NCS (1), both compounds involving the monoanionic form of the ligand, acetylacetone bis(S-n-propylisothiosemicarbazone), L. Slow recrystallization fromMeOH, EtOH, iPrOH and Me2CO gave the corresponding monosolvent complexes [Ni(L-H)]I?solvent, of which only those involving EtOH and iPrOH were suitable for structural analysis. The crystallographic parameters of [Ni(L-H)]I?EtOH (2) and [Ni(L-H)]I?iPrOH (3) are very similar to each other, showing their structures are isomorphic. The crystal structures of the title compounds consist of the independent ions: NCS-, or I-, and the chemically identical cation [Ni(L-H)]+, where L-H is the monoanion resulting from deprotonation of the acetylacetone moiety, a tetradentate N4 ligand forming a square-planar coordination around a Ni(II) ion. It was found that the isothiosemicarbazide fragment of the ligand has an imido form. The complex cations of the compounds [Ni(L-H)]NCS and [Ni(L-H)]I?EtOH exhibit significant difference only in the conformation of their propyl groups.

APA, Harvard, Vancouver, ISO, and other styles

Naeem, Muhammad, Saqib Ali, Saira Shahzadi, et al. "Synthesis, Characterization and DNA Binding Studies of Zn(II)/Cu(II) Complexes with 2,2`-Diphenyl Acetic Acid/2-(4-Hydroxyphenyl)Acetic Acid Ligand Precursors and Nitrogen Bases." Academic Journal of Chemistry, no. 51 (January 25, 2019): 1–9. http://dx.doi.org/10.32861/ajc.51.1.9.

Full text

Abstract:

The hydrated complexes 1, 3, 7 and 8 with the general formula (RCOO)2M.xH2O (where M = Zn & x = 6; M = Cu & x = 5,6) were synthesized by the reaction of sodium salt of 2,2`-diphenyl acetic acid or 2-(4-hydroxyphenyl)acetic acid (RCOONa) with Zn(NO3)2.6H2O or CuSO4.5H2O in an aqueous medium. The addition of methanolic solution of either bipyridine (bpy) or 1,10-phenanthroline (phen) to an aqueous suspension of 1, 3, 7 and 8 (produced in situ) result in the formation of mixed ligand products with the general formulae (RCOO)2M(bpy).xH2O (2, 4, 9 and 10) and (RCOO)2M(phen).xH2O (5 and 6). The complexes were characterized by microanalysis, FTIR and NMR (1H and 13C) spectroscopic techniques. The FTIR data suggested a bidentate coordination mode of the carboxylate ligand and complexes exhibited four/six-coordinated geometry in the solid state. The spectroscopic data also revealed the presence of coordinated water molecules in all complexes. 1H and 13C NMR data demonstrated the coordination between ligand and the metal in complex 1. The complexes were tested for their binding with salmon sperm DNA (SS-DNA). The DNA binding potential of the complexes owed to the presence of zinc metal and the nature of the incorporated ligand. The complexes showed a significant hypochromic effect and an intercalating mode of binding with SS-DNA. The complexes were screened against various bacterial and fungal strains to check their biological activity. All the complexes showed significant antibacterial activity but none of complex exhibit antifungal activity.

APA, Harvard, Vancouver, ISO, and other styles

Comba, Peter, Lena Daumann, Julie Lefebvre, et al. "Mono- and Dinuclear Copper(II) and Iron(II) Complexes of a Tetradentate Bispidine-diacetate Ligand." Australian Journal of Chemistry 62, no. 10 (2009): 1238. http://dx.doi.org/10.1071/ch09321.

Full text

Abstract:

The synthesis of a new tetradentate bispidine ligand (LH2 = 2,2′-(1,5-dimethyl-3,7-diazabicyclo[3.3.1]nonan-3,7-diyl)diacetic acid), containing two tertiary amine and two carboxylic groups, is reported along with the preparation and characterization of the corresponding Cu(ii) and Fe(iii) complexes. The mononuclear [LCu(OH2)]·4H2O (1) complex contains a five-coordinate Cu(ii) centre, which adopt a square pyramidal geometry with the four donor atoms of the ligand (N2O2) occupying the equatorial plane and a water molecule occupying the axial position. An axial electron paramagnetic resonance (EPR) signature is observed for 1 (gx = 2.054, gy = 2.050, gz = 2.234; Ax = 18 × 10–4 cm–1, Ay = 20 × 10–4 cm–1, Az = 188 × 10–4 cm–1) in frozen methanolic solution (0.1 mM). Dimerization of 1 in concentrated solution (10 mM) was observed by EPR spectroscopy (g∥ = 2.24, g⊥ = 2.07, A∥ = 195 × 10–4 cm–1, and A⊥ = 12 × 10–4 cm–1 for each Cu centre). The structure of the dimeric species [LCu(OH2)]2 (1b) was determined by a combination of molecular mechanics with the simulation of the EPR spectrum (MM-EPR). The dimer has each Cu(ii) centre coordinated by the two amines and one carboxylate of one ligand (L), while the other carboxylate bridges to the second Cu(ii) centre; each coordination sphere is completed by an axial water ligand, with the Cu···Cu distance 5.5 Å (relative orientation from EPR simulation: α = 60°, β = 0°, γ = 25°). The aqueous reaction between the tetradentate ligand (L) and Fe(ii) leads to the formation of an oxo-bridged diiron(iii) complex, [LFe-(μ-O)-FeL] (2), with a Fe–O–Fe angle of 180° (dFe···Fe = 3.516 Å), as revealed by X-ray crystallography. The Mössbauer spectrum of 2 consists of one quadrupole doublet with an isomer shift (δ) of 0.37 mm s–1 and a quadrupole splitting (ΔEQ) of 0.73 mm s–1, which is consistent with S = 5/2 Fe(iii) centres. Variable-temperature magnetic susceptibility measurements show the presence of intramolecular antiferromagnetic interactions between the two Fe(iii) centres, with an exchange coupling constant J of –91(3) cm–1 (H = –2JS1·S2).

APA, Harvard, Vancouver, ISO, and other styles

Abdellah, Mohamed A., Sotiris K. Hadjikakou, Nick Hadjiliadis, et al. "Synthesis, Characterization, and Biological Studies of Organotin(IV) Derivatives with o- or p-hydroxybenzoic Acids." Bioinorganic Chemistry and Applications 2009 (2009): 1–12. http://dx.doi.org/10.1155/2009/542979.

Full text

Abstract:

Organotin(IV) complexes with o- or p-hydroxybenzoic acids (o-H2BZAor p-H2BZA) of formulae[R2Sn(HL)2](whereH2L= o-H2BZAand R = Me- (1),n-Bu- (2));[R3Sn(HL)](whereH2L= o-H2BZAand R =n-Bu- (3), Ph- (4) orH2L= p-H2BZAand R =n-Bu- (5), Ph- (6)) were synthesized by reacting a methanolic solution of di- and triorganotin(IV) compounds with an aqueous solution of the ligand (o-H2BZAor p-H2BZA) containing equimolar amounts of potassium hydroxide. The complexes were characterized by elemental analysis, FT-IR, Far-IR, TGA-DTA, FT-Raman, Mössbauer spectroscopy,H1,S119n-NMR, UV/Vis spectroscopy, and Mass spectroscopy. The X-ray crystal structures of complexes1and2have also been determined. Finally, the influence of these complexes1–6upon the catalytic peroxidation of linoleic acid to hydroperoxylinoleic acid by the enzyme lipoxygenase (LOX) was kinetically studied and the results showed that triorganotin(IV) complex6has the lowestIC50value. Also complexes1–6were studied for their in vitro cytotoxicity against sarcoma cancer cells (mesenchymal tissue) from the Wistar rat, and the results showed that the complexes have high activity against these cell lines with triphenyltin((IV) complex4to be the most active one.

APA, Harvard, Vancouver, ISO, and other styles

Mithun, Das, and Chattopadhyay Shouvik. "Facile synthesis of a novel tetrazole Schiff base complex of CoIII via [3+2] cycloaddition of metal coordinated azide with cyanopyridine." Journal of Indian Chemical Society Vol. 92, Aug 2015 (2015): 1191–97. https://doi.org/10.5281/zenodo.5598701.

Full text

Abstract:

Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata-700 032, India E-mail : shouvik.chem@gmail.com Manuscript received online 26 September 2014, accepted 29 November 2014 The 1 : 2 condensation of ethylenediamine and salicylaldehyde yields a tetradentate N2O2 ligand N,N´-bissalicylidene-1,2-ethylenediimine (H2L = H2 Salen). When cobalt(II) acetate is added to the methanolic solution of H2L, followed by addition of sodium azide, a cobalt(III) azido Schiff base compound, Co2L2 (N3 )2 is formed. When this compound was made to react with 2-cyanopyridine under stirring condition, a novel cobalt(III) compound containing azide, tetrazole and Salen, [Co(H2CN4 )L(N3 )] (1), was produced. The compound was characterized by C, H, N analysis, UV-Vis, IR and X-ray crystal diffraction study.

APA, Harvard, Vancouver, ISO, and other styles

Mahesh, K. Singh, Bhaumik Samhita, and A. Lal Ram. "Synthesis and characterization of tris[N-(2-oxo-1-naphthylidene)glycinato]manganese( III) and its reaction products with oxygen, nitrogen and/or sulphur donors." Journal of Indian Chemical Society Vol. 84, May 2007 (2007): 418–26. https://doi.org/10.5281/zenodo.5819486.

Full text

Abstract:

Oepartment of Chemistry, Tripura University, Suryamaninagar-799 130, Tripura, India Department of Chemistry, North-Eastern Hill University, Shillong-793 022, Meghalaya, India Manuscript received 2 January 2007, revised 6 March 2007, accepted 19 March 2007 Manganese(ll) acetate tetrahydrate reacts with N-(2-hydroxy-1-naphthylidcne)glycine (ohgIH2) in methanolic solution in (1 : 3.5) molar ratio yielding the complex, tris[N-(2-oxo 1naphthylidene)glycinato]manganese(lll), [MnIII(ohgIH)3] and its reaction with other oxygen, nitrogen and/or sulphur donors results in the MnIII complexes having compositions [MnIII(ohgI)(L)(X)] [L = salicylate (sal), X = H2O, pyridine (py); 4-nicotinate (nic), X = H2O] and [MnIII (ohgl)(ohdtb)(Y)2].H2O [ohdtb = o- ydroxydithiobenzoate, Y = H2O, py, 3-picoline (3-pic)]. The complexes have been characterized by elemental analysis, molar conductance, magnetic moment, cyclic voltammetry, NMR, electronic and infrared spectral studies. On the basis of UV, IR and NMR spectral evidences, the ligand, N-(2- ydroxy-1- naphthylidene)glycine, exists predominantely in the quinoneamine form and acts as monobasic bidentate and dibasic tridentate ligand in the complexes.

APA, Harvard, Vancouver, ISO, and other styles

Bruce, MI, PA Humphrey, JM Patrick, BW Skelton, AH White, and ML Williams. "Pentakis(methoxycarbonyl)cyclopentadiene Chemistry. IX. Some Derivatives Containing Copper(I): X-Ray Structures of [Cu{C5(CO2Me)5}(Eph3)2] (E=P and As) and [{Cu(AsPh3)3}2(µ-O2CMe)][C5(CO2Me)5]." Australian Journal of Chemistry 38, no. 10 (1985): 1441. http://dx.doi.org/10.1071/ch9851441.

Full text

Abstract:

Reactions between Cu{C5(CO2Me)5}2 and excess PPh3, or between PPh3 and a methanolic solution of Cu2O in HC5(CO2Me)5('Cu{C5(CO2Me)5}'), have given Cu{C5(CO2Me)5}(PPh3)2; the P(C6H4Me-p)3 complex was also obtained, while addition of Ph2P(CH2)2PPh2 (dppe) to 'Cu{C5(CO2Me)5}' gave the salt [Cu(dppe)2] [C5(CO2Me)5]. Cu{C5(CO2Me)5}(AsPh3)2 was obtained similarly from AsPh3 and 'Cu{C5(CO2Me)5}' or from [CuI(CNMe)(AsPh3)]2 and Tl{C5(CO2Me)5}. The X-ray structures of Cu{C5(CO2Me)5}(EPh3)2 (E = P, As) show the complexes to have copper approximately tetrahedrally coordinated by the two EPh3 ligands and two carbonyl oxygens from adjacent CO2Me groups on the C5 ligand. The X-ray structure of [{Cu(AsPh3)3}2(μ-O2CR)] [C5(CO2Me)5] is also reported: an acetate or formate ligand bridges two Cu(AsPh3)3 units in the cation; the anion is a disordered C5(CO2Me)5- anion. Cu{C5(CO2Me)5}(PPh3)2 is monoclinic, space group P21/c, with a 9.151(5), b 19.28(1), c 27.78(2) Ǻ, β 95.21(5)°, Z 4; 2710 independent observed data were refined to R 0.072, R′0.084. Cu{C5(CO2Me)5}(AsPh3)2 is isomorphous, with a 9.105(4), b 19.198(11), c 27.85(2) Ǻ, β 92.86(4)°, Z 4; 4684 independent observed data were refined to R 0.045, R′ 0.035. [{Cu(AsPh3)3}2(μ-O2CMe)] [C5(CO2Me)5] is monoclinic, space group P2/n, with a 23.214(9), b 13.141(4), c 18.326(6) Ǻ, β 94.95(3)°, Z 2; 1896 independent observed data were refined to R 0.072, R′ 0.081.

APA, Harvard, Vancouver, ISO, and other styles

Norman, Richard E., Randolph A. Leising, Shiping Yan та Lawrence Que. "Unexpected assembly of a (μ-oxo)(μ-formato)diiron(III) complex from an aerobic methanolic solution of Fe(III) and the TPA ligand". Inorganica Chimica Acta 273, № 1-2 (1998): 393–96. http://dx.doi.org/10.1016/s0020-1693(97)06058-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Raj, Kumar Dubey, Kumar Mishra Sharad, Mariya Ayesha, and Kumar Mishra Anil. "Preparation, properties, spectral (IR, electronic, FAB-MS and PXRD) and magnetic characterization of some lanthanide complexes containing tridentate thiosemicarbazone ligand." Journal of Indian Chemical Society Vol. 90, Jan 2013 (2013): 41–48. https://doi.org/10.5281/zenodo.5764019.

Full text

Abstract:

Synthetic Inorganic & Metallo-Organic Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : rajalkoxy@yahoo.com Manuscript received online 24 January 2012, revised 22 February 2012, accepted 11 April 2012 Schiff bases, containing 'S' donor atom, such as benzophenonethiosemicarbazone (btscH), salicylidenethiosemicarbazone (stscH) and bis-salicylidenethiosemicarbazone (bstscH) have been reacted with methanolic solution of LnCJ3.7H2O (Ln = LaIII and CeIII) followed by addition of the saturated solution of KOH (in EtOH) in different molar ratio(s), afforded a variety of lanthanum(lll) chloride Schiff base complexes of the type, [Cl2Ln(L).4H2O] and [CILn(L)2.3H2O] (where L = btscH, stscH, bstscH and Ln = LaIII and CeIII). These complexes have been characterized by elemental analysis, molar conductance, spectral (IR, UV-Visible and FAB-mass) as well as magnetic studies. X-Ray powder diffraction on two of the complex was recorded on Rigaku Model D/Max-2200 PC using Cu-Kα, radiation (λ = 1.5406 Å). The crystallite size of the complexes [CILa(bstsc)2.3H2O] (6) and [CICe(bstsc)2 .3H2O] (12) were found to be 280 and 191Å respectively. On the basis of these physico-chemical data a tentative structure for these complexes have been proposed. These complexes were found to be soild and were soluble in Lewis bases such as in DMF and DMSO or pyridine.

APA, Harvard, Vancouver, ISO, and other styles

Stolz, Peter, Wolfgang Saak, Henry Strasdeit та Siegfried Pohl. "Mangan(II)-Komplexe mit dem vierzähnigen Stickstoffliganden C12H22N6(L): Synthese von [MnX2L] (X = Cl, Br, I, NCS), Kristallstrukturen von [MnCl2L] und [MnBr2L] / Manganese(II) Complexes with the Tetradentate Nitrogen Ligand C12H22N6(L): Synthesis of [MnX2L] (Χ = Cl, Br, I, NCS), Crystal Structures of [MnCl2L] and [MnBr2L]". Zeitschrift für Naturforschung B 44, № 6 (1989): 632–36. http://dx.doi.org/10.1515/znb-1989-0603.

Full text

Abstract:

[MnCl2(C12H22N6)] (1) and [MnBr2(C12H22N6)] (2) are obtained from the reaction of MnX2 (X = Cl, Br) with C12H22N6 in methanolic solution.In chloroform MnI2, OPPh3, and C12H22N6 react to give [MnI2(C12H22N6)] (3). With small variations of the reaction conditions [MnI2(C12H22N6)] · xCHCl3 (4) may be crystallized. The reaction of [Mn(NCS)2(OPPh3)4] with C12H22N6 in CHCl3 solution gives [Mn(NCS)2(C12H22N6)] · xCHCl3 (5). The structures of 1 and 2 were determined from single crystal X-ray diffraction data. The isotypic compounds crystallize in the orthorhombic space group Pbcn with Z = 4; 1: a = 1592.4(1), b = 785.0(1), c = 1270.7(1) pm; 2: a = 1590.0(1), b = 802.6(1), c = 1316.6(1) pm. C12H22N6 acts as a tetradentate ligand. The isolated complexes exhibit a twofold symmetry.Manganese(II) is in a six-coordinate environment, which can be described better as a distorted tetrahedron with two additional Mn-N bonds rather than as a distorted octahedron.The Mn-N bond lengths are 229.9(1) and 248.7(1) pm for 1 and 228.2(3) and 248.4(3) pm for 2. The Mn-Hal bond lengths are 239.2(1) (1) and 254.2(1) pm (2)

APA, Harvard, Vancouver, ISO, and other styles

M., K. Singh, Bhaumik S., and A. Lal R. "Synthesis and characterization of manganese(IV) complexes with tris(hydroxymethyl)-N-(2-oxo-l-naphthylideneamino )methane Schiff base." Journal of Indian Chemical Society Vol. 83, Nov 2006 (2006): 1080–86. https://doi.org/10.5281/zenodo.5832272.

Full text

Abstract:

Department of Chemistry, Tripura University, Suryamaninagar-799 130, Tripura, India Department of Chemistry, North-Eastern Hill University, Shillong-793 003, Meghalaya, India Manuscript received 1 June 2006, accepted 17 August 2006 Manganese(II) acetate tetrahydrate reacts with tris(hydroxymethyl)-N-(2-oxo-1-naphthylideneamino)methane (ohthH4) in methanolic solution in (1 : 2.5) molar ratio yielding the complex, bis[tris(hydroxymethyl)-N-(2-oxo-1- naphthylideneamino)methane]manganese(IV), (MnIV (ohthH2)2] and its reaction with other oxygen and nitrogen donors results the complexes of manganese(Iv) of the compositions [MnIV(ohthH)(sal)] (2) and [MnIV(ohthH)(sal) (A)]  [A = pyridine(3), 3-picoline (4)].The complexes have been characterized by elemental analysis,molar conductance, magnetic moment, cyclic voltammetry, electronic, ESR and infrared spectral studies. On the basis of UV, IR and NMR spectral evidences,the ligand, tris(hydroxymethyi)-N-(2-hydroxy-1-naphthylideneamino)methane, have been show & to exist predominantely in the qulnoneamine form and acting as dibasic tridentate, tribasic tetradentate and tribasic tridentate in these complexes.

APA, Harvard, Vancouver, ISO, and other styles

A., K. De, Deb D., R. Nath Bhowmik K., and N. Dutta Purkayastha R. "Synthesis, spectral characterization and reactivity study of new Schiff base complexes of divalent manganese, copper and zinc." Journal of Indian Chemical Society Vol. 86, Jan 2009 (2009): 76–82. https://doi.org/10.5281/zenodo.5807190.

Full text

Abstract:

Department of Chemistry, Tripura University, Suryamaninagar-799 130, West Tripura, India E-mail : rndp@rediffmail.com Manuscript received 14 May 2008. revised 8 September 2008. accepted 17 September 2008 New Schiff base complexes of MnII , CuII and ZnII of the type [M(HL)CH3COO(H2O)]2H2O (M = Mn), [M(HL)CH3COO(H2O)] (M = Cu or Zn), H2L = N-(4-carboxyphenyl)salicylaldimine, have been synthesized from the reaction of the Schiff base ligand with the respective metal acetate in a methanolic solution maintaining the metal to ligand ratio as 1 : J. Complexes have been characterized on the basis of elemental analyses, FT-IR, NMR, ESR, electronic spectroscopy, room temperature magnetic moment measurements and by TGA/DTA studies. The results of above studies suggest that the newly synthesized complexes are tetra coordinated and Schiff base is acting as bidentate ligand, ligated to the metal center through its phenolic oxygen and azomethine nitrogen atoms respectively. Copper(II) complex appears to be square planar:- while MnII and ZnII complexes are essentially tetrahedral. Thermal study indicate that CuII and ZnII complexes are thermally stable up to a temperature of ca. 150°C, whereas manganese(ll) complex undergo loss of two molecules of lattice water between 120-125°C, followed by the loss of coordinated water molecule between 190- 200°C. MnII complex has demonstrated its catalytic potential in oxidizing the selective organic substrate viz. benzyl alcohol by H2O2 as the oxidant.

APA, Harvard, Vancouver, ISO, and other styles

Sisin, Noor Nabilah Talik, Merfat Algethami, Awatef S. Assran, and Wan Nordiana Rahman. "Analysis of Novel Schiff Base-Fe Complexes Against Breast Cancer Cells’ Viability." Key Engineering Materials 965 (November 28, 2023): 59–68. http://dx.doi.org/10.4028/p-cnfqt2.

Full text

Abstract:

Two potential novels Schiff base iron (Fe) complexes Fe-L2 and Fe-L3 (where L2= N, N'-bis (o-hydroxyacetophenone) ethylenediamine and L3= N, N'-bis (o-hydroxybenzaldehyde) phenylenediamine) were synthesized from interaction a hot methanolic solution of each ligand L2 or L3 (0.01mole) with the appropriate amount of Fe (NO3)3.9H2O metal salt (0.01mole). This study investigated the cytotoxicity induced by both complexes (0.1 to 100 µg/ml) in MCF-7 and MDA-MB 231 cell lines. After 24 hours of treatment, the cell viabilities of both MCF-7 and MDA-MB-231 cells were linearly proportional to the Fe-L2 concentrations. A higher concentration of Fe-L2 would cause higher cell killings. On the other hand, most of the Fe-L3 concentrations caused total cell deaths for both cell lines, except for the lowest concentration (0.1 µg/ml). Fe-L2 and Fe-L3 also caused lower cell viability of MDA-MB-231 cells compared to MCF-7 cells. Overall, the obtained Fe-L3 is more toxic than Fe-L2 in breast cancer cells. It is suggested that the Fe-L3 is an excellent agent against breast cancer cells; meanwhile, the Fe-L2 is biocompatible and a good support in medical applications, especially as a radiosensitizer in radiotherapy.

APA, Harvard, Vancouver, ISO, and other styles

A., P. MISHRA. "Synthesis and Characterization of some Metal Ion Complexes with 8-Acetyl-7-hydroxy-4-methylcoumarin-4-chloro/nitroaniline." Journal of Indian Chemical Society Vol. 75, Apr 1998 (1998): 251–52. https://doi.org/10.5281/zenodo.5917158.

Full text

Abstract:

Inorganic Research Laboratories, Department of Chemistry, Dr. H. S. Gour University, Sagar-470 003 Manuscript received 9 June 1997, revised 20 August 1997, accepted 29 August 1997 The Schiff base compounds of 8-acetyl-7-hydroxy-4-methylcoumarin with substituted aromatic amines, viz. 4-chloroaniline and 4- nitroaniline have been synthesized and their metal complexes with CuII, NiII and CoII have been prepared. The Schiff bases function as bidentate anionic ligands chelating through deprotonated phenolic oxygen and azomethine nitrogen. The ligand field parameters of the complexes have been evaluated.

APA, Harvard, Vancouver, ISO, and other styles

Adams, Paul A., and Alfred E. A. Thumser. "Haem-peptide-protein interactions: Part 5. The haem undecapeptide microperoxidase-11 (Fe3+MP-11)/human serum albumin (HSA) reaction in aqueous methanolic solution. A simple system demonstrating the effect of hydrophobicity on ligand release from a ligand-protein complex." Journal of Inorganic Biochemistry 50, no. 1 (1993): 1–7. http://dx.doi.org/10.1016/0162-0134(93)80009-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Stritt, Anika, E. Alper Ünal, Elisabeth Irran, and Andreas Grohmann. "“Coordination caps” of graded electron-donor capacity." Zeitschrift für Naturforschung B 79, no. 12 (2024): 705–22. https://doi.org/10.1515/znb-2024-0093.

Full text

Abstract:

Abstract An efficient synthesis of the novel {6-[1,1-di(pyridin-2-yl)ethyl]pyridine-2-yl}2-methyl-1,3-propanediamine (2) is reported, as well as a reliable large-scale synthesis (of the order of 100 g) of previously known 2,2’-[1-(6-chloropyridin-2-yl)ethane-1,1-diyl]dipyridine (4); the latter is the starting material for the preparation of the former, as well as a multitude of other polypodal polyamine/polyimine ligands. Both materials, as well as the intermediates in their multi-step syntheses, have been fully characterised. Ligand 2, in conjunction with ligands 2,2’-(pyridine-2,6-diyl)bis(2-methylpropane-1,3-diamine) (1) and 2,6-bis(1,1-di(pyridin-2-yl)ethyl)pyridine (3), establishes a series of tetrapodal pentadentate N5 ligands L of like scaffold, and thus coordination geometry, but graded primary amine/imine donor atom ratios. The iron(II) complexes [Fe(L)NCCH3](OTf)2 (L = 1: A; L = 2: B; L = 3: C; OTf = triflate) have been prepared and fully characterised, including X-ray single-crystal structure analyses. The metal-centred one-electron oxidation/reduction potential (FeII/FeIII) depends sensitively on the electron donor capacity of the capping ligand used, as demonstrated by cyclic voltammetry. Whereas the acetonitrile ligand in A and C is readily exchanged for a methanol ligand in methanol solution, the resulting complexes showing variable-temperature spin crossover (SCO) in solution, B has been found to be inert to this type of ligand exchange.

APA, Harvard, Vancouver, ISO, and other styles

SUBHASH, B. SHARMA, P. SINGH VDAY, and K. SINGH MAHENDRA. "Synthesis and Structural Studies of a New Series of Bimetallic Complexes with Nitrogen or Oxygen Donor Ligands." Journal of Indian Chemical Society Vol. 63, Sep 1986 (1986): 794–96. https://doi.org/10.5281/zenodo.6298715.

Full text

Abstract:

Department of Chemistry, M L K. (P. G ) College, Balrampur-271 201 Manuscript received 6 November 1985, revised 19 May 1986, accepted 18 June 1986 The metal cyanates, M(NCO)2 where M of CoII or NiII react with TI2(SCN)2 to form addition compounds of the type M(NCO)2Tl2(SCN)2 These compounds behaves as Lewis acid and form complexes with certain ligands (L), viz tetrahydrofuran (thf), dimethylsulphoxide (dmso) methanol (MeOH), nicotinamide (nia), pyridine (py) 2,2-bipyridyl (bipy) and 1,10-phenanthroline (phen). These complexes are characterised by elemental analysis, molar conductance, magnetic moment electronic and infrared spectra! studies The nature of bonding has been related to the quantitative softness parameters of metals and ligands, and the proosed structures are also supported by Pearson's HSAB principles

APA, Harvard, Vancouver, ISO, and other styles

Kaase, Dominic, та Julia Klingele. "trans-Bis[2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole-κ2N2,N3]bis(methanol-κO)iron(II) bis(perchlorate)". Acta Crystallographica Section E Structure Reports Online 70, № 7 (2014): m252—m253. http://dx.doi.org/10.1107/s160053681401277x.

Full text

Abstract:

The title compound, [Fe(C12H8N4S)2(CH3OH)2](ClO4)2, crystallized in the solvent-free form from a methanol solution. The FeIIion is located on a centre of inversion. The distorted N4O2octahedral coordination geometry is formed by twoN,N′-chelating equatorial 2,5-bis(pyridin-2-yl)-1,3,4-thiadiazole ligands and axially coordinating methanol coligands, resulting in the mononucleartrans-(N2,N3,O)2coordination mode. The methanol co-ligand is involved in a hydrogen bond to the perchlorate counter-ion.

APA, Harvard, Vancouver, ISO, and other styles

Male, Yusthinus T., Helna Tehubijuluw, and Paulina M. Pelata. "Synthesis of Binuclear Complex Compound of {[Fe(L)(NCS)Â¬2]2oks} (L = 1,10-phenantrolin and 2,2â€™-bypiridine)." Indonesian Journal of Chemical Research 1, no. 1 (2013): 15–22. http://dx.doi.org/10.30598/ijcr.2013.1-yus.

Full text

Abstract:

The paramagnetic complex {[Fe(fen)(NCS)2]2oks} have been synthesized in methanol solution using 1-10 phenantrolin, 2,2 '-bipyridine, NCS- ligands and oxalate as bridging ligand. Synthesis of Fe (II) with ligands phenantrolin produced three complexes is paramagnetic compounds each with a value of magnetic moment (Î¼) of 5.98 BM, 7.34 BM and 6.00 BM, respectively. For complexes with bipyridine ligand complexes obtained two diamagnetic compounds with the magnetic moment (Î¼) was 3.57 BM and 3.50 BM, respectively. It could concluded that the field strength of bipyridine ligand cannot be reduced by NCS- ligand. Analysis results showing that the synthesized compound is a binuclear complex with {[Fe(fen)(NCS)2]2oks} molecular formula. This conclusion was supported by the measurement of conductivity, magnetic moment, IR spectroscopy and XRD analysis.

APA, Harvard, Vancouver, ISO, and other styles

Inoue, Aoi, Soichiro Yoshimoto, and Masaaki Abe. "Coordination and Structural Control of Trinuclear Ruthenium Clusters Using Organic Ligands at HOPG Surface." ECS Meeting Abstracts MA2024-02, no. 67 (2024): 4643. https://doi.org/10.1149/ma2024-02674643mtgabs.

Full text

Abstract:

Controlling the self-assembly and nanoarchitectures of metal complexes at the molecular scale is essential for the development of new functional materials and devices. Since two-dimensional (2D) sheets consisting of metal complexes can be designed and controlled with various bonding modes, geometric structures, and chemical functions, they have been studied using various approaches by selecting metal ions and organic ligands. Trinuclear metal clusters contain three metal ions in one complex and are expected to be building blocks for the formation of 2D sheets of metal complexes by selecting their shape and axial ligands. In this study, a trinuclear cluster of ruthenium ions, Ru3O(EtCOO)6(CO)(THF)2:1, was used as the core to form nanostructures on highly oriented pyrolytic graphite (HOPG) substrates via axial ligand exchange with 1,4-Di (4-pyridyl) benzene:2 and 4,4’-di(4-pyridyl) biphenyl: 3. The adlayer structures and electrochemical properties of the nanoarchitectures were investigated by atomic force microscopy (AFM) and cyclic voltammetry (CV). In the experimental procedure, powders of 1, 2, and 3 were dissolved in methanol (MeOH) and tetrahydrofuran (THF), respectively, and a 0.78 µM solution was prepared. A predetermined amount of this was cast on HOPG, dried to form a thin film, and the thin film was observed in air using AFM. Next, equal amounts of 1 and 2 and 1 and 3 solutions were mixed in each solvent, and after heating a water bath at 60°C for 1 h, thin films were prepared in the same manner and observed by AFM. Ultraviolet–visible (UV-vis) absorption spectra and electrochemical measurements by CV were performed before and after heating the mixed solutions. First, in the AFM image of the thin film prepared by casting the MeOH mixture of 1 and 2, two stripe-like domains with different heights were observed, which matched the heights of the structures obtained in the AFM images of the single-domain formation of 1 and 2. In addition, no new absorption peaks were observed in the UV-vis absorption spectrum after mixing the solution; it was inferred that 1and 2 did not exchange ligands. However, when the mixed solution was heated in a water bath for 1 h, a few striped domains were observed, and a new ring-like structure was formed. The CV results also supported the change in the AFM images and absorption spectra after heating the solution. Before heating the mixed solution, a small redox peak was observed around 0.8 V, whereas after the warm bath, a large redox peak was observed around 0.6 V. A dramatic change in the magnitude of the current density was observed, indicating a significant improvement in conductivity. These results suggest that heating the mixed solution replaced THF ligand 1 with 2, forming a cyclic structure consisting of 1 and 2. When the same experiment was carried out in THF solution, a different structure was observed from that of the methanol solution, and a one-dimensional (1D) molecular wire structure was formed after heating the water bath. The absorption spectra and CV results also supported that ligand exchange occurred in the 1D wire structure, revealing the solvent dependence of the nanoarchitecture. When 3 was used as the axial ligand, larger structures were formed compared to 2, and one-dimensional wire structures of several micrometers were observed in the THF solution after the warm bath. Larger current densities and peak separations are also observed in the voltammograms. Thus, the length dependence of the organic ligand for the nanoarchitecture formation on the HOPG surface was demonstrated. Figure 1

APA, Harvard, Vancouver, ISO, and other styles

Hamada, Yahia Z., Wesley R. Harris, and Nigam P. Rath. "Crystal Structure of Pyridoxal Amino Methyl Phosphonic Acid (PYRAMPA) and Its Stability Constants with Al3+." International Journal of Green Nanotechnology 1 (January 1, 2013): 194308921350703. http://dx.doi.org/10.1177/1943089213507032.

Full text

Abstract:

The crystal structure of the newly synthesized ligand pyridoxal amino methyl phosphonic acid (PYRAMPA) from green materials in deionized water and methanol is presented. It took only two steps to prepare this new ligand. The ligands’ stability constants with Al3+ are also reported in aqueous solutions at 25 °C ± 0.1 °C. The ligand was introduced as part of our concerted efforts to identify and synthesize an orally effective aluminum sequestering agent due to the known toxic effect of aluminum in living organisms particularly humans. PYRAMPA is a multidentate ligand suitable to sequester aluminum with very high stability.

APA, Harvard, Vancouver, ISO, and other styles

Šima, Jozef, Mário Izakovič, and Marián Žitňanský. "Mechanism of deactivation processes of excited iron(III) thiocyanato complexes with benacen-type ligands." International Journal of Photoenergy 2006 (2006): 1–5. http://dx.doi.org/10.1155/ijp/2006/78234.

Full text

Abstract:

The complexes [Fe(4-R-benacen)(CH3OH)(NCS)], where 4-R-benacen2−are tetradentate open-chainN,N′-ethylenebis(4-R-benzoylacetoneiminato)N2O2-ligands (R=H, Cl, Br,OCH3), are redox stable in the dark in methanolic solutions. Irradiation of the complexes into intraligand and/or ligand-to-metal charge-transfer bands induces a series of photophysical and photochemical deactivation processes leading to Fe(II) andCH2Oas final products in a2:1molar ratio. Formation of polystyrene containing bonded NCS group when irradiating the complexes in the presence of styrene monomer used as a radical scavenger indicates that the primary photoreduction of Fe(III) to Fe(II) is accompanied by the oxidation of NCS−ligand to•NCS radical. 4-R-benacen-ligands behave as an innocent moiety virtually not participating in the photoinduced redox processes. The quantum yield of Fe(II) formationΦFe(II)decreases significantly with increased wavelength of the incident radiation, and is slightly influenced by the peripheral groups R of the 4-R-benacen-ligands.

APA, Harvard, Vancouver, ISO, and other styles

Bock, Hans, and Erik Heigel. "Die Kristallstrukturen von Phenylen-1,4-bis(4-nitrophenylsulfonamid) und seines Dinatrium(tetramethanol-dihydrat)-Salzes / Interaction in Molecular Crystals, 161 [1, 2]. The Crystal Structures of Phenylene-1,4- bis(4-nitrophenylsulfonamide) and of its Disodium(tetramethanol-dihydrate) Salt." Zeitschrift für Naturforschung B 55, no. 11 (2000): 1045–52. http://dx.doi.org/10.1515/znb-2000-1110.

Full text

Abstract:

Lipophilically wrapped polyion-aggregates of alkali salts are fascinating examples of selforganisation, which stimulate the design of novel ligands. Phenylene-1,4-bis(4-nitrophenylsulfonamide),. selected and structurally characterized, can be deprotonated by [NaH]∞ in THF to its dianion. Recrystallisation from methanol solution however, does not yield the polyion aggregate expected, but a disodium(tetramethanol-dihydrate) salt, for which a structure determination proves an intriguing three-dimensional network of Na⊕ ···O contacts to sulfonamide as well as nitro substituents and the small solvent molecules methanol as well as water. Ligand comparison between polyioncluster-forming tetraphenylimidodiphosphate and the title phenylene- 1,4-bis(4-nitrophenylsulfonamide) allows to specify the ligand properties necessary for the self-aggregation of alkali salts.

APA, Harvard, Vancouver, ISO, and other styles

Carac, Andreea, Rica Boscencu, Geta Carac, and Simona Gabriela Bungau. "Spectral Study of Some Lanthanides Complexes with Quaternary Pyridinium Ligands." Revista de Chimie 68, no. 10 (2017): 2265–69. http://dx.doi.org/10.37358/rc.17.10.5868.

Full text

Abstract:

Some lanthanides complexes with two N-heterocyclic ligands derived from 4,4`-bipyridinium and 1,2-bis-(4-pyridinium) ethane (noted BP and BPE) were studied in presence of triethylamine and methanol in view of their application as cytotoxic agents. Absorption spectra have been recorded by UV-Vis spectroscopy during the complexation process in solution. The ligands demonstrate preferential arrangements in lanthanide�s electronic structure which is identified much clearly in ultraviolet range. La(III)-BP solution indicates absorption at lmax= 206 nm while La(III)-BPE at lmax of 208 nm. The solution from the Nd(III)-BPE complex synthesis shows the highest absorbance at lmax= 220 nm, compared with Nd(III)-BP at lmax= 212 nm. The bathochromic shifts of the spectral bands can be assigned to the physical interaction of Ln(III) ions with ligands. No major changes were observed in the absorption, hypsochromic and hyperchromic effects when varying the ligand. The complexes spectral properties were performed by dissolving them in methanol in three phases until a complete dissolution of the precipitates was achieved.

APA, Harvard, Vancouver, ISO, and other styles

Strasdeit, Henry, and Siegfried Pohl. "Achtfachkoordination von Cadmium(II) und sekundäre Metall—Ligand-Bindungen in [Cd(NO3)2(C12H22N6)] und [Cd(C12H22N6)2(BF4)2 / Eight-Coordination of Cadmium(II) and Secondary Metal —Ligand Bonds in [Cd(NO3) 2(C12H22N6)] and [Cd(C12H22N6) 2(BF4)2." Zeitschrift für Naturforschung B 43, no. 12 (1988): 1579–88. http://dx.doi.org/10.1515/znb-1988-1210.

Full text

Abstract:

Abstract [Cd(NO3)2(C12H22N6)] (1), [Cd(C12H22N6)2](BF4)2 (2), and [Cd(C12H22N6)2](ClO4)2 (3) are obtained from methanolic solutions by reaction of 2,5,8,10,13,16-Hexaazapentacyclo[ 8.6.1.125.0918.0l3,7]octadecane (C12H22N6) with Cd(NO3)2-4H2O, Cd(BF4)2, and Cd(ClO4)2 · 6H2O, respectively. 1 crystallizes in the monoclinic space group C2/c with a = 10.346(1), b =18.162(1), c - 10.462(1) Å, β = 112.95(1)°, and Z = 4. 2 is monoclinic, space group P21/n, a = 16.958(1), b = 10.653(1), c = 18.747(1) Å, β= 112,66(1)°, and Z = 4. The X-ray structures of 1 and 2 were refined to R(Rw) = 0.028 (0.029) and 0.060 (0.057), respectively. The compounds contain discrete [Cd(NO3)2(C12H22N6)] and [Cd(C12H22N6)2]2+ complexes, respectively. The Cd atoms are eight-coordinated with four primary and four longer, secondary metal -ligand bonds. In both complexes the hexaamine has an axially symmetrical configuration and acts as a tetradentate ligand. The N03 ligands are aniso-bidentate. Mean bond lengths are (Cd -N)prim 2.308(3), (Cd-N)sec 2.676(3), (Cd-0)prim 2.331(2), (Cd-0)sec 2.593(3) Å for 1, and (Cd-N)prim 2.374 (ligand 1), 2.438 (ligand 2), (Cd-N)sec 2.746 (ligand 1), 2.702 Å (ligand 2) for2. In water the neutral complex 1 dissociates and behaves as an 1:2 electrolyte. 13C and 113Cd NMR data and the conductivity of solutions of 2 or 3 in dimethyl sulfoxide indicate a fast but incomplete exchange of the ligands in [Cd(C12H22N6)2]2+ by solvent molecules

APA, Harvard, Vancouver, ISO, and other styles

James, M. "The Structure and Magnetic Properties of the Two-Dimensional Di-Pyrazine Bridged Polymers M(pz)2Br2 (M = FeII, CoII, NiII)." Australian Journal of Chemistry 55, no. 3 (2002): 219. http://dx.doi.org/10.1071/ch01094.

Full text

Abstract:

The polymeric compounds M(pyrazine)2Br2 [M = Fe (1), Co (2), and Ni (3)] have been synthesized by the addition of a solution of pyrazine in methanol to a methanolic solution of the anhydrous metal bromide. The crystal structures of (1)-(3) were determined using powder synchrotron and neutron diffraction data and were found to be isostructural. The structures consist of pseudo-octahedral units, doubly linked by pyrazine ligands to form two-dimensional sheets. Magnetic susceptibility data were recorded for each complex down to 5 K and reveal paramagnetic behaviour at high temperatures and antiferromagnetic interactions at low temperatures. Comparison of the structures and magnetism of these and other M(pz)2X2 compounds highlight the relative importance of the canting of the pyrazine ligands on the strength of the magnetic exchange.

APA, Harvard, Vancouver, ISO, and other styles

Devi, Jai, Som Sharma, and Sanjeev Kumar. "Synthesis, spectral studies and antimicrobial evaluation of transition metal complexes of bidentate Schiff base ligands derived from 4-amino quinoline." Research Journal of Chemistry and Environment 26, no. 5 (2022): 56–70. http://dx.doi.org/10.25303/2605rjce5670.

Full text

Abstract:

Coordination compounds of Co(II) , Ni(II), Cu(II) and Zn(II) of the type [M(L1-2)2(H2O)2] were obtained from Schiff base ligands [HL1-2] by the condensation reaction of 5-bromosalicyldehyde/5-chlorosalicyldehyde with 4-amino quinoline using methanol as a solvent in (1:1) molar ratio. The metal complexes were synthesized by reacting the aqueous methanolic solution of metal acetates M(CH3COO)2xH2O with the hot methanolic solution of their respective Schiff base ligands in (1:2) molar ratio. Various physicochemical techniques i.e. elemental analysis, molar conductance measurements, magnetic moment studies and different spectral studies (1H NMR, 13C NMR, UV–Vis, FT-IR, ESR) and mass spectrometry were used for characterization of compounds. The spectral data confirmed the bidentate nature (NO) of Schiff base ligands coordinating through nitrogen atom of azomethine group and oxygen atom of hydroxyl group resulting in the formation of octahedral geometry of all metal complexes. The Schiff base ligands and their transition metal complexes were screened against two gram-positive bacterial species i.e. (S. aureus, B. subtilis), two-gram negative bacterial species i.e. (E. coli, P. aeruginosa) and two fungal species (A. niger and C. albicans) using serial dilution method with ciprofloxacin and fluconazole as reference drug. The results obtained from antimicrobial studies showed that metal complexes are more active than their respective Schiff base ligands. Complex 5 and 6 are potent antimicrobial agent.

APA, Harvard, Vancouver, ISO, and other styles

Melo, Guilherme Henrique Franca, Tiffany Yau, Yuxin Liu, and Uttandaraman Sundararaj. "Preparation of ZIF-67@PAN Nanofibers for CO2 Capture: Effects of Solvent and Time on Particle Morphology." Fibers 13, no. 5 (2025): 50. https://doi.org/10.3390/fib13050050.

Full text

Abstract:

Advanced materials including metal–organic frameworks (MOFs) are a critical piece of the puzzle in the search for solutions to various scientific and technological challenges, such as climate change due to the ever-increasing emissions of greenhouse gas. There is intense interest in MOFs due to their potential use for a variety of environmental applications, including catalysis and gas storage. In this work, we specifically focus on the in situ growth of zeolitic imidazolate framework-67 (ZIF-67) on poly(acrylonitrile) (PAN) fibers and its potential application in CO2 adsorption. Nanofibers were spun from a solution containing PAN and cobalt (II) nitrate hexahydrate using electrospinning. Then, the fibers were immersed in solution with 2-methylimidazole for different time durations. Via the diffusion of the cobalt ions through the fibers and interaction with the ligands in the solution, ZIF-67 was formed. From analysis via SEM, FTIR, PXRD, and CO2 adsorption, it is evident that varying different parameters—the type of solvent, immersion time, and ligand concentration—affected the morphology of the formed ZIF-67. It was found that immersion for 4 h in 6.0 mg/mL of ligands in methanol created the ZIF-67@PAN best suited for CO2 adsorption, showing a CO2 uptake of 0.4 mmol/g at 1.2 bar and 273 K.

APA, Harvard, Vancouver, ISO, and other styles

Ali Saleh, Rezan, Hikmat Ali Mohammad, and Salim Najm Aldin Saber. "New Mixed Ligand Cobalt(II), Nickel(II) and Copper(II) Complexes of 2,2'-Bipyridine-3,3'-Dicarboxylic acid (bpdc) with 2-Mercapto-5-Phenyl-1,3,4-Oxadiazole (phozSH) and Their Antioxidant activity." Oriental Journal Of Chemistry 36, no. 05 (2020): 834–42. http://dx.doi.org/10.13005/ojc/360506.

Full text

Abstract:

The mixing of one mole of 2,2'-bipyridine-3,3'-dicarboxylic acid (bpdc) with two mole of potassium hydroxide (KOH) in methanol were refluxed for (half hour), followed by addition of one mole methanol solution of MCl2.nH2O (where M=Co, Ni or Cu). The mixture was refluxed for (2 hours) to give colored complexes of the metal ions of [M(bpdc)(H2O)4]. The [M(bpdc)(H2O)4] were reacted with one mole of 2-Mercapto-5-phenyl-1,3,4-oxadiazole (phozSH) producing the colored mixed ligand complexes with general formula [M(bpdc)(phozSH)(H2O)3] in which the metal ions coordinated to the ligand through O-atoms of carboxyl group in (bpdc) and N-atom of (phozSH) ligand. The ligands and complexes are well identified by using Furrier transform infrared spectroscopy, 1H-NMR, 13C-NMR, Electronic spectroscopy, CHNS analysis, Melting point, conductivity measurement. The Antioxidant activity were screened for all the complexes by the use of 2, 2-diphenyl-1-picrylhydrazyl (DPPH) method.

APA, Harvard, Vancouver, ISO, and other styles

Rouco, Lara, Rosa Pedrido, M. Isabel Fernández-García, Ana M. González-Noya, and Marcelino Maneiro. "Methanolysis of 2-Cyanopyridine in the Coordination Sphere of Manganese(II). The Structure of Mn4L6Cl2 cluster (L = Methyl Picolinimidate)." Proceedings 9, no. 1 (2018): 60. http://dx.doi.org/10.3390/ecsoc-22-05659.

Full text

Abstract:

The reaction of 2-cyanopyridine and Mn(II) in methanol solution led to the formation of a Mn4L6Cl2 cluster 1 containing O-methyl picolimidate as a ligand (L). The coordination of 2-cyanopyridine to the Mn(II) ion as a chelating bidentate ligand activated the CN triple bond which subsequently suffered a nucleophilic attack by CH3OH. Complex 1 was characterized by standard techniques including microanalysis, IR spectroscopy, ESI spectrometry, and magnetic susceptibility measurements. The crystal structure of 1 was determined by X-ray diffraction techniques, and the crystallographic studies revealed a planar-diamond array for 1 where the six monoanionic picolinimidates act as chelating ligands through the two nitrogen atoms.

APA, Harvard, Vancouver, ISO, and other styles

Šima, Jozef, Dáša Lauková, and Vlasta Brezová. "Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands." Collection of Czechoslovak Chemical Communications 66, no. 1 (2001): 109–18. http://dx.doi.org/10.1135/cccc20010109.

Full text

Abstract:

Photoredox reactions occurring in irradiated methanolic solutions of trans-[FeIII(R,R'-salen)(CH3OH)I], where R,R'-salen2- are N,N'-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N2O2-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH3), 3-OCH3, 5-OCH3, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, •CH2OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH2O is close to 2 : 1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!