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Journal articles on the topic 'NiII-Schiff base complex'

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Published: 5 June 2025
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1

Xu, Bin, Yan-Yan Zhang, Wen-Long Liu, and Xiao-Ya Hu. "Hexaaquanickel(II) bis{[N-(2-hydroxybenzylidene)alanylglycinato]cuprate(II)} dodecahydrate." Acta Crystallographica Section E Structure Reports Online 62, no. 7 (2006): m1508—m1509. http://dx.doi.org/10.1107/s1600536806021179.

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The crystal structure of the title compound, [Ni(H2O)6][Cu(C12H11N2O4)]2·12H2O, consists of CuII complex anions, NiII complex cations and solvent water molecules. The CuII ion is located on a general position and coordinated by a Schiff base ligand with a square-planar CuN2O2 geometry. The NiII ion is located on an inversion center and coordinated by six water molecules in an octahedral geometry.
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2

Dehghanpour, Saeed, Ali Mahmoudi, Fatemeh Sepaveh та Seik Weng Ng. "[N,N′-Bis(trans-2-nitroprop-2-enylidene)ethylenediamine-κ2 N,N′]dibromonickel(II)". Acta Crystallographica Section E Structure Reports Online 62, № 7 (2006): m1462—m1463. http://dx.doi.org/10.1107/s1600536806019775.

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3

Peng, Sanjun, Congshan Zhou, and Tao Yang. "Bis[2-(4-chlorophenyliminomethyl)phenolato]nickel(II)." Acta Crystallographica Section E Structure Reports Online 62, no. 5 (2006): m1066—m1068. http://dx.doi.org/10.1107/s1600536806013389.

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In the title mononuclear nickel(II) complex, [Ni(C13H9ClNO)2], the NiII atom lies on an inversion center and is coordinated by the N and O atoms of the two Schiff base ligands in a square-planar geometry. The dihedral angle between the two chlorophenyl rings is 39.5 (3)°.
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4

Georgopoulou, Anastasia N., Michael Pissas, Vassilis Psycharis, Yiannis Sanakis, and Catherine P. Raptopoulou. "Trinuclear NiII-LnIII-NiII Complexes with Schiff Base Ligands: Synthesis, Structure, and Magnetic Properties." Molecules 25, no. 10 (2020): 2280. http://dx.doi.org/10.3390/molecules25102280.

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The reaction of the Schiff base ligand o-OH-C6H4-CH=N-C(CH2OH)3, H4L, with Ni(O2CMe)2∙4H2O and lanthanide nitrate salts in a 4 : 2 : 1 ratio lead to the formation of the trinuclear complexes [Ni2Ln(H3L)4(O2CMe)2](NO3) (Ln = Sm (1), Eu (2), Gd (3), Tb (4)). The complex cations contain the strictly linear NiII-LnIII-NiII moiety. The central LnIII ion is bridged to each of the terminal NiII ions through two deprotonated phenolato groups from two different ligands. Each terminal NiII ion is bound to two ligands in distorted octahedral N2O4 environment. The central lanthanide ion is coordinated to four phenolato oxygen atoms from the four ligands, and four carboxylato oxygen atoms from two acetates which are bound in the bidentate chelate mode. The lattice structure of complex 4 consists of two interpenetrating, supramolecular diamond like lattices formed through hydrogen bonds among neighboring trinuclear clusters. The magnetic properties of 1-4 were studied. For 3 the best fit of the magnetic susceptibility and isothermal M(H) data gave JNiGd = +0.42 cm−1, D = +2.95 cm−1 with gNi = gGd = 1.98. The ferromagnetic nature of the intramolecular Ni···Gd interaction revealed ground state of total spin S = 11/2. The magnetocaloric effect (MCE) parameters for 3 show that the change of the magnetic entropy (−ΔSm) reaches a maximum of 14.2 J kg−1 K−1 at 2 K. A brief literature survey of complexes containing the NiII-LnIII-NiII moiety is discussed in terms of their structural properties.
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5

Kargar, Hadi, Reza Kia, and Muhammad Nawaz Tahir. "{4,4′,6,6′-Tetrabromo-2,2′-[2,2-dimethylpropane-1,3-diylbis(nitrilomethanylylidene)]diphenolato}nickel(II)." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (2012): m753. http://dx.doi.org/10.1107/s1600536812020375.

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The asymmetric unit of the title compound, [Ni(C19H16Br4N2O2)], comprises half of a Schiff base complex. The geometry around the NiII atom, located on a twofold rotation axis, is distorted square-planar, which is supported by the N2O2 donor atoms of the coordinated ligand. The dihedral angle between the substituted benzene rings is 23.19 (17)°. In the crystal, a short intermolecular Br...Br [3.6475 (7) Å] interaction is present.
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6

You, Zhong-Lu, Xiao Han, Jia Wang, and Shu-Yun Niu. "Azido{4-bromo-2-[(2-diethylaminoethylimino)methyl]phenolato}nickel(II)." Acta Crystallographica Section E Structure Reports Online 62, no. 4 (2006): m851—m853. http://dx.doi.org/10.1107/s1600536806010051.

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The title mononuclear nickel(II) complex, [Ni(C13H18BrN2O)N3], contains two molecules in the asymmetric unit. Each NiII atom is four-coordinated by one phenolate O atom, one imine N atom and one amine N atom from a Schiff base ligand, and by one terminal N atom of an azide anion, forming a square-planar coordination. In the crystal structure, adjacent molecules are linked through C—H...N interactions, forming chains along the a axis.
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7

Perlepe, Panagiota S., Konstantinos N. Pantelis, Luís Cunha-Silva, Vlasoula Bekiari, Albert Escuer, and Theocharis C. Stamatatos. "Rare Nuclearities in Ni(II) Cluster Chemistry: An Unprecedented {Ni12} Nanosized Cage from the Use of N-Naphthalidene-2-Amino-5-Chlorobenzoic Acid." Inorganics 8, no. 5 (2020): 32. http://dx.doi.org/10.3390/inorganics8050032.

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The self-assembly reaction between NiI2, benzoic acid (PhCO2H) and the Schiff base chelate, N-naphthalidene-2-amino-5-chlorobenzoic acid (nacbH2), in the presence of the organic base triethylamine (NEt3), has resulted in the isolation and the structural, spectroscopic, and physicochemical characterization of the dodecanuclear [Ni12I2(OH)6(O2CPh)5(nacb)5(H2O)4(MeCN)4]I (1) cluster compound in ~30% yield. Complex 1 has a cage-like conformation, comprising twelve distorted, octahedral NiII ions that are bridged by five μ3-OH−, one μ-OH−, an I− in 55% occupancy, five PhCO2− groups (under the η1:η1:μ, η1:η2:μ3 and η2:η2:μ4 modes), and the naphthoxido and carboxylato O-atoms of five doubly deprotonated nacb2− groups. The overall {Ni12} cluster exhibits a nanosized structure with a diameter of ~2.5 nm and its metallic core can be conveniently described as a series of nine edge- or vertex-sharing {Ni3} triangular subunits. Complex 1 is the highest nuclearity coordination compound bearing the nacbH2 chelate, and a rare example of polynuclear NiII complex containing coordinating I− ions. Direct current (DC) magnetic susceptibility studies revealed the presence of predominant antiferromagnetic exchange interactions between the NiII ions, while photophysical studies of 1 in the solid-state showed a cyan-to-green centered emission at 520 nm, upon maximum excitation at 380 nm. The reported results demonstrate the rich coordination chemistry of the deprotonated nacb2− chelate in the presence of NiII metal ions, and the ability of this ligand to adopt a variety of different bridging modes, thus fostering the formation of high-nuclearity molecules with rare, nanosized dimensions and interesting physical (i.e., magnetic and optical) properties.
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8

Mathur, Suvigya, and Sartaj Tabassum. "New homodi-and heterotrinuclear metal complexes of Schiff base compartmental ligand: interaction studies of copper complexes with calf thymus DNA." Open Chemistry 4, no. 3 (2006): 502–22. http://dx.doi.org/10.2478/s11532-006-0020-6.

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AbstractThe new homodinuclear complexes 1–4 of the type [LMII 2Cl2], heterotrinuclear complexes 5 and 6 of the type [LMII 2SnIVCl6] where M = CuII, MnII, CoII, NiII and CuII and NiII, respectively have been synthesized and characterized by elemental analysis and various spectroscopic techniques. The homodinuclear complexes possess two different environments (N2 and N2O2donor sets) for holding the metal ions. The metal ion in N2 set exhibits square planar geometry with two chloride ions in the inner sphere but rhombic structure is found in tetradentate N2O2 Schiff base cavity while in heterotrinuclear complexes SnIV atom is in the octahedral environment. The interaction of complexes 1 and 5 with calf thymus DNA was carried out by absorption spectroscopy and cyclic voltammetry. The intrinsic binding constants (K b) of complex 1 and 5 were determined as 3.2 × 103 M−1 and 9.6 × 103 M−1, respectively suggesting that complex 5 binds more strongly to CT-DNA than complex 1. Fluorescence studies along with viscosity measurements have also been checked to authenticate the binding of metal complexes with DNA.
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9

Kara, Duygu Akin, Adem Donmez, Hulya Kara та M. Burak Coban. "Structural and spectroscopic characterization of a new luminescent NiII complex: bis{2,4-dichloro-6-[(2-hydroxypropyl)iminomethyl]phenolato-κ3 O,N,O′}nickel(II)". Acta Crystallographica Section C Structural Chemistry 74, № 8 (2018): 901–6. http://dx.doi.org/10.1107/s2053229618009166.

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The design and preparation of transition-metal complexes with Schiff base ligands are of interest due to their potential applications in the fields of molecular magnetism, nonlinear optics, dye-sensitized solar cells (DSSCs), sensing and photoluminescence. Luminescent metal complexes have been suggested as potential phosphors in electroluminescent devices. A new luminescent nickel(II) complex, [Ni(C10H10Cl2NO2)2], has been synthesized and characterized by single-crystal X-ray diffraction and elemental analysis, UV–Vis, FT–IR, 1H NMR, 13C NMR and photoluminescence spectroscopies, and LC–MS/MS. Molecules of the complex in the crystals lie on special positions, on crystallographic binary rotation axes. The NiII atoms are six-coordinated by two phenolate O, two imine N and two hydroxy O atoms from two tridentate Schiff base 2,4-dichloro-6-[(2-hydroxypropyl)iminomethyl]phenolate ligands, forming an elongated octahedral geometry. Furthermore, the complex exhibits a strong green luminescence emission in the solid state at room temperature, as can be seen from the (CIE) chromaticity diagram, and hence the complex may be a promising green OLED (organic light-emitting diode) in the development of electroluminescent materials for flat-panel-display applications.
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10

Kumari, Meena, and Vikas Sangwan. "Antimicrobial, Pharmacokinetic and Semi-empirical Study of Some Schiff Base Metal Complexes." Oriental Journal Of Chemistry 41, no. 2 (2025): 647–53. https://doi.org/10.13005/ojc/410234.

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The present piece of research work comprises of synthesis and characterisation of Schiff base ligand and its metal complexes with CoII, NiII, CuII and ZnII in their chlorides form. The ligand is derived from phthaldehyde and 2-amino-4-chlorobenzenethiol, a thiol based amine. IR, UV-visible, elemental analysis, magnetic moment, and EPR are used to characterize the compounds. The Agar Well diffusion method was used to screen each complex for antimicrobial qualities. Additionally, ADME studies were conducted to assess their pharmacokinetic behaviour. All metal complexes have been projected to have an octahedral geometry, and the ligand behaves like a tetradentate ligand. The newly synthesized complex has been found to have good antimicrobial properties. Pharmaco-kinetic behaviour reveal about their potential biological application. Semi-empirical studies were performed so obtained the energy minimised geometry of the ligand and the complex.
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11

Sönmez, Mehmet, and Memet Şekerci. "The template synthesis, spectral characterization and thermal behavior of new binuclear Schiff base complexes derived from N-aminopyrimidine with 2,3-butandion." Journal of the Serbian Chemical Society 72, no. 3 (2007): 259–64. http://dx.doi.org/10.2298/jsc0703259s.

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Anew series of two types of acyclic binuclear Schiff base complexes, prepared by the template condensation of N-aminopyrimidine and 2,3-butandion in the presence of Cu(II), Ni(II), Co(II) and Zn(II) in n-BuOH solution, were analyzed and characterized by elemental analyses, IR and electronic spectroscopy, conductivity and magnetic measurements. From the conductivity measurements, it is concluded that the complex of NiII is a 1:1 type of electrolyte. All the complexes have sub-normal magnetic moments in accordance with their binuclear nature. The thermal behaviour of the complexes was studied by thermogravimetry.
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12

M., Sivasankaran Nair, and Arish D. "Synthesis, characterization and antimicrobial studies of CoII, NiII, CuII and ZnII complexes involving a bidentate Schiff base ligand." Journal of Indian Chemical Society Vol. 88, Feb 2011 (2011): 265–70. https://doi.org/10.5281/zenodo.5773479.

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Department of Chemistry, Manonmaniam Sundaranar University, Tirunelveli-627 012, Tamilnadu, India <em>E-mail :</em> msnairchem@rediffmail.com <em>Manuscript received 09 February 2010, revised 25 May 2010, accepted 03 June 2010</em> Co<sup>ll</sup>, Ni<sup>ll</sup>, Cu<sup>ll</sup> and Zn<sup>ll</sup> complexes of the Schiff base derived from vanillin and 3-aminobenzoic acid were synthesized and characterized by elemental analysis, conductivity, infrared, electronic, magnetic measurements and SEM. The analytical data show the composition of the metal complex to be ML<sub>2</sub>, where L is the Schiff base ligand. The conductance data indicate that all the complexes are non-electrolytes. IR results demonstrate the bidentate binding of the Schiff base ligand involving azomethine nitrogen and carboxylato oxygen atoms. The electronic spectral measure ments indicate that Co<sup>ll</sup> and Ni<sup>ll</sup> complexes have tetrahedral geometry, while Cu<sup>ll</sup> complex is square planar. The magnetic measurements show paramagnetic behaviour for Co<sup>ll</sup>, Ni<sup>ll</sup> and Cu<sup>ll</sup> complexes. The SEM studies show that all the complexes are in the nanocrystalline regime. The antimicrobial activity of synthesized ligand and its complexes were screened against the <em>bacterial species, Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris&nbsp;</em>and <em>Pseudomonas aeruginosa</em> and the fungal species Candida albicans, Rhizopus stolonifer, Aspergillus flavus, Aspergillus niger and Rhizoctonia bataicola by disc diffusion method. Antimicrobial studies indicate that the metal complexes are more active than the ligand.
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13

Rusanova, Julia A., Vladimir N. Kokozay та Olena V. Pokas. "Tris(μ2-2-methoxy-6-{[(2-sulfidoethyl)imino]methyl}phenolato)trinickel(II) dimethylformamide monosolvate: crystal structure, spectroscopic characterization and antibacterial activity". Acta Crystallographica Section E Crystallographic Communications 75, № 5 (2019): 616–19. http://dx.doi.org/10.1107/s2056989019004730.

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The title trinuclear nickel(II) complex, [Ni3(C10H11NO2S)3]·C3H7NO, with a Schiff base ligand formed in situ from 2-aminoethanethiol and o-vanillin crystallizes in the orthorhombic space group Pbca. Its asymmetric unit consists of one neutral Ni3 L 3 molecule and one DMF solvent molecule. The solid-state organization of the complex can be described as an insertion of the solvent molecules within the crystallographically independent trinuclear NiII species. Several C—H...π edge-to-face interactions and π–π stacking interactions link the components in the crystal. A first example of a short intermolecular C—H...Ni contact is found. Antibacterial in vitro screening revealed that the title compound has antibacterial activity, the best effect being against Acinetobacter baumannii.
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14

Howard-Smith, Kyle J., Alexander R. Craze, Mohan Badbhade, et al. "Syntheses and Structure Investigations of 3d Transition Metal Complexes with a Flexible N4O2-Donor Hexadentate Schiff-Base Ligand." Australian Journal of Chemistry 70, no. 5 (2017): 581. http://dx.doi.org/10.1071/ch16678.

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The syntheses and structure investigations of four new 3d transition metal complexes (1–4) with a flexible N4O2-donor hexadentate Schiff-base ligand are described; three complexes (1, 2, and 4) of FeIII, CoIII, and CuII metal ions have been investigated by UV-vis, FT-IR, high-resolution mass spectrometry (HR-MS), and scanning electron microscopy–electron dispersive spectroscopy, as well as single crystal X-ray diffraction. The X-ray structure of NiII complex 3 is also reported. The molecular structures of the complexes (1–3) demonstrate distorted octahedral coordination geometry, each exhibiting 1 : 1 (M : L) ratios and the CuII complex 4 shows a trinuclear structure with a CuII : L ratio of 3 : 2 in the solid state, which has been proven by X-ray diffraction. On the other hand, a mononuclear species of the CuII complex is formed in solution, which has been identified by electrospray ionization HR-MS.
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15

Terenzi, Alessio, Daniela Lötsch, Sushilla van Schoonhoven, et al. "Another step toward DNA selective targeting: NiII and CuII complexes of a Schiff base ligand able to bind gene promoter G-quadruplexes." Dalton Transactions 45, no. 18 (2016): 7758–67. http://dx.doi.org/10.1039/c6dt00648e.

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16

Ghosh, Tanmoy Kumar, Prithwish Mahapatra, Subrata Jana, and Ashutosh Ghosh. "Variation of nuclearity in NiII complexes of a Schiff base ligand: crystal structures and magnetic studies." CrystEngComm 21, no. 31 (2019): 4620–31. http://dx.doi.org/10.1039/c9ce00574a.

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Four Ni<sup>II</sup> complexes have been synthesized by changing the reaction conditions and stoichiometry of the reactants. The magnetic coupling in the NiII4 complex is ferromagnetic whereas that in the NiII6 complex is antiferromagnetic.
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17

Yousif, Enaam, and Eman Ali Atiyah. "New Semicarbazone-Schiff Base Coordination; Synthesis, Characterization and Biological Evaluation." Wasit Journal for Pure sciences 3, no. 2 (2024): 333–44. http://dx.doi.org/10.31185/wjps.367.

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The synthesis and characterisation of a new azo Schiff base ligand generated from a semicarbazone moiety are reported in this study, in addition to its metal complexes. The title ligand, (E)-2-((2-hydroxy-3-((E)-(2-nitrophenyl) diazenyl) naphthalen-1-yl) methylene) hydrazine-1-carboxamide (HL), was synthesised by reacting ((E)-2-hydroxy-3-((2-nitrophenyl) diazenyl)-1-naphthaldehyde) with semicarbazidein a 1:1 molar ratio. Afterward, the interplay between HL and other metal ions (CrШ, MnII, CoII, NiII and CuII) produced monomeric coordination complexes in a 1:1 ligand-to-metal ratio. A range of spectroscopic and analytical techniques, such as magnetic susceptibility, conductance tests, 1H and 13C-NMR, FT-IR, electronic and mass spectroscopy, and elemental microanalysis, were used to extensively characterize these complexes. The synthesis of coordination compounds with six-coordinate geometries was verified by the characterization data. The study also assessed the antimicrobial efficacy of the synthesised compounds against various bacterial and fungal species, revealing that After the complex formed, the ligand's antimicrobial activity was greatly increased.
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18

Bañares, M. A., A. Angoso, J. L. Manzano, E. Rodríguez, and G. Sanz. "Synthesis of New Alkanediamine Schiff Bases Containing an Ester Function. Preparation and Characterization of NiII Complex with 1,3-Trimethylenediamine Schiff Base." Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 19, no. 4 (1989): 357–67. http://dx.doi.org/10.1080/00945718908048075.

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19

Hasan, Hasan A. "Fluorescence, Biological Activity and Spectroscopic Studies of Azo-linked Schiff Base Ligand Type (ONO) and Its Complexes with CrIII, CoII NiII and CdII Ions." Ibn AL- Haitham Journal For Pure and Applied Science 30, no. 3 (2017): 114. http://dx.doi.org/10.30526/30.3.1607.

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The precursor [W] [2-(2-(naphthalen-5-yl) diazenyl)-4-amino-3-hydroxynaphthalene-1sulfonic acid] was synthesized from reaction of diazonium salt with 1-amino-2-naphtol-4sulfonic acid. Then the tridentate Schiff base ligand type ONO was synthesized from the reaction of the precursor with salicyaldehyde in 1:1 mole ratio to produce the ligand H2L [2-(2-(naphthalen5-yl) diazenyl)-4-(2-hydroxynaphthalen-3-yl)methyleneamino)-3-hydroxy salicyalene-1-sulfonic acid],the reaction achieved in methanol as a solvent under reflux. Spectroscopic methods IR, U.V, 1H,13C-NMR was used to characterize the ligand. Complexes of [CrIII, CoII, NiII and CdII] ions were also prepared through reaction of ligand with metal salts in 2:1 mole ratio at reflux, using KOH as a base, ethanol as a solvent. Chloride content, molar conductivity and melting point measurements along with I.R and U.V-Vis, atomic absorption (A.A) spectroscopy were used to characterize the complexes.1H-NMR spectroscopy was used to characterize Cd complex. Thermal analysis was used to insure the presence of crystallized H2O molecule in the complexes structure. The following formula was proposed for Cr complex: K[Cr(L)2]. H2O, while CoII, NiII and CdII complexes have the K2[M(L)2].H2O formula. The biological activity of the prepared compounds was studied. Fluorescence properties of the prepared compounds were studied (at room temperature) which indicate that the ligand may behave as strong fluorescent emitter. The complexes also showed fluorescence characteristic with the ligand. The ligand revealed high relative intensity and its fluorescence peak were also shifted to the lower or higher wavelength when compared with the complexes.
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20

S., Vigneswari, M. Avinash Raj K., and Jeyarajendran A. "Synthesis, spectral characterization and biological evaluation of MnII, NiII and CuII complexes with new N2 S2 Schiff base ligand." Journal of Indian Chemical Society Vol. 96, Jan 2019 (2019): 150–52. https://doi.org/10.5281/zenodo.5653436.

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Advanced Materials Research Laboratory, Department of Chemistry, Loyola College, Chennai-600 034, India <em>E-mail</em>: jeyarajend@gmail.com <em>Manuscript received online 29 August 2018, accepted 10 October 2018</em> Schiff base ligand of isophthalidene-bis-(methylhydrazinylcarbothiamide) abbreviated as (IMHC) was synthesized by the condensation reaction of isophthaldehyde and <em>N</em>-methylhydrazinylcarbothiamide. Metal complexes were synthesized by using metal ions, Mn<sup>II</sup>, NiII, Cu<sup>II</sup> and the ligand, IMHC which were characterized by UV-Visible, IR, and <sup>1</sup>H NMR spectroscopy and further confirmed by mass analysis. The IMHC and the metal complexes were screened for <em>in vitro</em> antimicrobial activity against <em>Salmonella</em> t<em>yphimurium</em>, <em>Shigella flexneri</em> and <em>Micrococcus leuteus</em> by disc diffusion method and found that Mn<sup>II</sup> and Cu<sup>II</sup> complexes showed higher inhibitory activity compared to Ni<sup>II</sup> complex.
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Jiang, Yin Zhi, Yang Zou, and Lian Qun Zhang. "Synthesis and Crystal Structure of a New Ni2+ Complex1." Advanced Materials Research 441 (January 2012): 387–91. http://dx.doi.org/10.4028/www.scientific.net/amr.441.387.

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(S,S)-N,N’- bi-(benzal)-1,2-cyclohexanediamine Schiff base (1) was synthesized and characterized by 1 H NMR spectra, MS spectra and IR spectra. And the coordination reaction of 1 with chlorate of Ni(II) was studied. The reaction of 1 with NiII salt [NiCl2] generates a new compound (2). 2 was characterized using IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. Crystal data for 2: space group Coca, with a = 24.580(4)Å, b = 9.5829(13)Å, c = 7.6836(11)Å, α=90.00º, β=90.00º, γ=90.00º, Z=4, V= 1809.8(5)Å3, Dc=1.446 mg.m-3, µ=1.376 mm-1, F(000)=840. There are 6 coordination sites around Ni2+ of 2, which are respectively occupied by two oxygen atoms (all from two H2O molecules) and four nitrogen atoms [all from two 1,2-cyclohexanediamine molecule]. The Ni atom and four chelating nitrogen atoms are coplanar. There exist intra-molecular H-bond and intermolecular H-bond. The mechanism of metal-assisted decomposition of 1 was also discussed briefly.
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22

Koley Seth, Banabithi, Aurkie Ray, Sampa Biswas, and Samita Basu. "NiII–Schiff base complex as an enzyme inhibitor of hen egg white lysozyme: a crystallographic and spectroscopic study." Metallomics 6, no. 9 (2014): 1737. http://dx.doi.org/10.1039/c4mt00098f.

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23

Vassilyeva, Olga Yu, Elena A. Buvaylo, Vladimir N. Kokozay, Sergey L. Studzinsky, Brian W. Skelton, and Georgii S. Vasyliev. "NiII molecular complex with a tetradentate aminoguanidine-derived Schiff base ligand: structural, spectroscopic and electrochemical studies and photoelectric response." Acta Crystallographica Section E Crystallographic Communications 78, no. 2 (2022): 173–78. http://dx.doi.org/10.1107/s2056989022000317.

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The new molecular nickel(II) complex, namely, {4-bromo-2-[({N′-[(2-oxidobenzylidene)amino]carbamimidoyl}imino)methyl]phenolato}nickel(II) N,N-dimethylformamide solvate monohydrate, [Ni(C15H11BrN4O2)]·C3H7NO·H2O, (I), crystallizes in the triclinic space group P\overline{1} with one molecule per asymmetric unit. The guanidine ligand is a product of Schiff base condensation between aminoguanidine, salicylaldehyde and 5-bromosalicylaldehyde templated by Ni2+ ions. The chelating ligand molecule is deprotonated at the phenol O atoms and coordinates the metal centre through the two azomethine N and two phenolate O atoms in a cis-NiN2O2 square-planar configuration [average(Ni—N/O) = 1.8489 Å, cis angles in the range 83.08 (5)–95.35 (5)°, trans angles of 177.80 (5) and 178.29 (5)°]. The complex molecule adopts an almost planar conformation. In the crystal, a complicated hydrogen-bonded network is formed through N—H...N/O and O—H...O intermolecular interactions. Complex (I) was also characterized by FT–IR and 1H NMR spectroscopy. It undergoes an NiII ↔ NiIII redox reaction at E 1/2 = +0.295 V (vs Ag/AgCl) in methanol solution. In a thin film with a free surface, complex (I) shows a fast photoelectric response upon exposure to visible light with a maximum photovoltage of ∼178 mV.
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Dermitzaki, Despina, Angeliki Panagiotopoulou, Michael Pissas, Yiannis Sanakis, Vassilis Psycharis, and Catherine P. Raptopoulou. "Synthesis, Crystal Structures and Magnetic Properties of Trinuclear {Ni2Ln} (LnIII = Dy, Ho) and {Ni2Y} Complexes with Schiff Base Ligands." Crystals 12, no. 1 (2022): 95. http://dx.doi.org/10.3390/cryst12010095.

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The reaction of the Schiff base ligand o-OH-C6H4-CH=N-C(CH2OH)3, H4L, with Ni(O2CMe)2∙4H2O and lanthanide nitrate salts in a 4:2:1 ratio lead to the formation of the trinuclear complexes [Ni2Ln(H3L)4(O2CMe)2](NO3) (Ln = Dy (1), Ho (2), and Y (3)) which crystallize in the non-centrosymmetric space group Pna21. The complex cation consists of the three metal ions in an almost linear arrangement. The {Ni2Ln} moieties are bridged through two deprotonated Ophenolato groups from two different ligands. Each terminal NiII ion is bound to two ligands through their Ophenolato, the Nimino atoms and one of the protonated Oalkoxo groups in a distorted octahedral. The central lanthanide ion is coordinated to four Ophenolato oxygen from the four ligands, and four Ocarboxylato atoms from two acetates which are bound in the bidentate chelate mode, and the coordination polyhedron is biaugmented trigonal prism, which probably results in a non-centrosymmetric arrangement of the complexes in the lattice. The magnetic properties of 1–3 were studied and showed that 1 exhibits field induced slow magnetic relaxation.
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Raman, Natarajan, Chinnathangavel Thangaraja, and Samuelraj Johnsonraja. "Synthesis, spectral characterization, redox and antimicrobial activity of Schiff base transition metal(II) complexes derived from 4-aminoantipyrine and 3-salicylideneacetylacetone." Open Chemistry 3, no. 3 (2005): 537–55. http://dx.doi.org/10.2478/bf02479281.

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AbstractA novel tetradentate N2O2 type Schiff base, synthesized from 1-phenyl-2,3-dimethyl-4-aminopyrazol-5-one(4-aminoantipyrine) and 3-salicylidene-acetylacetone, forms stable complexes with transition metal ions such as CuII, NiII, CoII and ZnII in ethanol. Microanalytical data, magnetic susceptibility, IR, UV-Vis.,1H-NMR, ESR and Mass spectral techniques were used to confirm the structures. Electronic absorption spectra of the complexes suggest a square-planar geometry around the central metal ion. These complexes show higher conductance values, supporting their electrolytic nature. The monomeric nature of the complexes was confirmed from their magnetic susceptibility values. Cyclic voltammogram of the copper(II) and nickel(II) complexes in DMSO solution at 300 K were recorded and the results are discussed. The X-band ESR spectra of the copper complex were recorded and the molecular orbital coefficient values were calculated from the spectra. The in vitro antimicrobial activities of the investigated compounds were tested against bacteria such as Klebsiella pneumoniae, Staphylococcus aureus, Bacillus subtilis and Escherichia coli and fungi like Aspergillus niger and Rhizoctonia bataicola. Most of the metal chelates show higher antimicrobial activity for the above microorganisms than that of the free ligand.
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Chaudhary, Narendra Kumar, and Biswash Guragain. "Coordination Chemistry, Antibacterial Screening, and In Silico ADME Study of Mononuclear NiII and CuII Complexes of Asymmetric Schiff Base of Streptomycin and Aniline." Journal of Chemistry 2022 (August 13, 2022): 1–14. http://dx.doi.org/10.1155/2022/3881217.

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Two novel metal complexes, that is, Ni (StmAn)2(4) and Cu (StmAn)2(5), were synthesized from unsymmetrical Schiff base ligand StmAn (3). The ligand was prepared by refluxing streptomycin (2) and aniline (1). They were characterized by elemental microanalysis, conductivity measurements, and spectroscopic techniques such as 1H NMR, FT-IR, ESI-mass, and electronic absorption spectral study. Interestingly, the study revealed metal coordination through azomethine nitrogen and N-atom of NH-CH3 of N-methyl-L-glucosamine unit of streptomycin. The electronic absorption spectral study supported an octahedral geometry for complex 4 and a tetrahedral geometry for complex 5. Particle size calculation by Scherrer’s formula indicated their nanocrystalline nature. The geometry optimization of the complexes was achieved by running an MM2 job in Gaussian supported Cs-ChemOffice ultra-12.0.1 and ArgusLab 4.0.1 version software. Based on SwissADME predictions, a theoretical drug profile was generated by analyzing absorption, distribution, metabolism, excretion, and toxicity (ADMET) scores of the compounds. They were screened for in vitro antibacterial activity study against four clinical pathogens such as E. coli, S. pneumoniae, P. vulgaris, and S. aureus. Minimum inhibitory concentration (MIC) study demonstrated greater inhibitory potency of complex (4) (0.024 g/L) for S. aureus relative to ligand (3) and complex (5). Studies show that metal complexes are more toxic to bacteria.
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Parshati, Majumdar, Santra Dhiman, and Sarkar Mitali. "Analytical strategy for sample preparation in trace metal analysis." Journal of Indian Chemical Society 93, Jul 2016 (2016): 883–88. https://doi.org/10.5281/zenodo.5638344.

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Department of Chemistry, University of Kalyani, Kalyani-741 235, West Bengal, India <em>E-mail</em> : msarkar@klyuniv.ac.in, mitali_ku@yahoo.com<em> Fax</em> : 91-33-25828282 A two phase extraction of Ni<sup>II</sup> from aqueous to non ionic surfactant is carried out as a sample preparation step prior to determination of Ni<sup>II</sup> in different matrices. The Ni<sup>II</sup>-Schiff base complex formed in the aqueous phase was subsequently transferred to the Triton X-100 phase. The process was optimized for operational variables viz. pH, concentration of the surfactant as well as the ligand, incubation time and temperature. The cloud point temperature was evaluated in presence of different electrolytes with varying concentrations. Both the salting-in and salting-out agents were tested to optimize the cloud point temperature and maximize the extraction efficiency. Extraction efficiency was more than 95%. The negative free energy change indicates that the process is favorable and spontaneous one. The process is applied for extraction and preconcentration of Ni<sup>II </sup>from alloy, water and soil sample.
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D., Prakash, Kumar Chandan, and R. R. P. Singh K. "Binuclear complexes of CuII and NiII Schiff base of 2-hydroxy-1-naphthaldehyde and o-phenylenediamine with alkali metal salts of oxygen and nitrogen containing organic acids." Journal of Indian Chemical Society Vol. 85, Apr 2008 (2008): 371–75. https://doi.org/10.5281/zenodo.5814736.

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Department of Chemistry, Patna University, Patna-800 005, Bihar, India <em>Manuscript received 1 October 2007, accepted 12 December 2007</em> A number of stable heterobinuclear alkali metal complexes of general formula M<sub>a</sub>PhN.MbL, where M8 Cu<sup>ll</sup> or Ni<sup>ll</sup>; Mb = Li, Na or K; PhN = <em>N,N&#39;</em>-1,2-phenylene-bis(2-hydroxy-1-naphthaldimine); L = deprotonated onitrophenol (ONP), 2,4-dinitrophenol (DNP), 2,4,6-trinitrophenol (TNP) or 1-nitroso-2-naphthol (1N2N) have been synthesized using Cu<sup>II</sup> or Ni<sup>II</sup> metal chelates of Schiff base and alkali metal salts of ONP, DNP, TNP and 1N2N. The IR spectra suggest bonding between the Ni<sup>II</sup> or Cu<sup>II</sup> metal chelate and alkali metal which appear by dative bond via oxygen atoms of C-O (phenolic). Low value of molar conductance would suggest them to be non-electrolyte. These complexes are biologically active against bacteria viz. <em>E. coli</em> and <em>S. aureus</em> and fungus viz. <em>C. albicans</em> and so these may be treated as good antibacterial agents and fungicides. It was therefore, though interesting to synthesize the title compounds and examine their antimicrobial activity.
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Jameson, D., M. N. Potenza, J. A. Potenza, and H. J. Schugar. "Structure of bis(N-isopropylidene-1H-imidazole-4-ethylamine)nickel(II) diperchlorate, a NiII–Schiff-base complex derived from histamine and acetone." Acta Crystallographica Section C Crystal Structure Communications 41, no. 12 (1985): 1736–38. http://dx.doi.org/10.1107/s010827018500926x.

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30

Shipra, Sagar, and Naskar Subhendu. "Coordination complexes of Schiff base ligand : 5-Diethylamino 2-thiazole 2-yliminomethyl phenol with MnII, CoII, NiII and CuII ions; phenoxazinone synthase like activity of CuII complex." Journal of Indian Chemical Society Vol. 94, Jan 2017 (2017): 29–36. https://doi.org/10.5281/zenodo.5603310.

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Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi-835 215, Jharkhand, India <em>E-mail</em> : subnaskar@yahoo.co.in Fax : 91-651-2275401 <em>Manuscript received 31 June 2016, revised 17 October 2016, accepted 24 October 2016</em> A new Schiff base ligand, 5-diethylamino 2-thiazole 2-yliminomethyl phenol (HL) has been synthesized by condensation of 2-aminothaizole with 4-diethylaminosalicylaldehyde. A series of complexes of first row transition metal ions (Cu<sup>2</sup>+, Mn<sup>2</sup>+, Co<sup>2</sup>+ and Ni<sup>2</sup>+) with the ligand are reported here. The ligand and the metal complexes have been characterized through spectroscopic techniques e.g. NMR, ESIMS, FTIR, UV-Vis spectroscopy; elemental analysis, cyclic voltammetry and differential pulse voltammetry. The reported Cu<sup>II</sup> complex were examined in <em>vitro</em> for the catalytic oxidation of 2-aminophenol to 2-aminophenoxazine-3-one. The catalytic activity of complex was investigated with UV-Vis spectrophotometry in MeOH medium. Kinetic parameters for the catalytic activity of the complexes are as follows : <sup>V</sup>max = 1.2&times;10&ndash;<sup>8</sup> M s&ndash;<sup>1</sup> , K<sub>cat</sub> = 4.3 h&ndash;1 , KM = 3.304&times;10&ndash;<sup>4</sup> M.
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31

D., Prakash, Kumar Chandan, K. Gupta A., Prakash S., and R. R. P. Singh K. "Binuclear complexes of CuII and NiII Schiff base of salicylaldehyde and 1,2-propylenediamine with alkali metal salts of oxygen and nitrogen containing organic acids." Journal of Indian Chemical Society Vol. 85, Mar 2008 (2008): 252–56. https://doi.org/10.5281/zenodo.5809038.

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Department of Chemistry, Patna University, Patna-800 005, Bihar, India <em>Manuscript received 7 June 2007, revised 5 November 2007, accepted 7 December 2007</em> A number of new heterobinuclear alkali metal complex of general formula M<sub>a</sub>PS.M<sub>b</sub>L have been synthesized and characterized, where M, = Cu<sup>II</sup> or Ni<sup>II</sup>, PS = <em>N,N&#39;</em>-1,2-propylene-bis(salicylaldimine), M<sub>h</sub> = Li, Na or K and L = deprotonated <em>o</em>-nitrophenol, 2,4-dinitrophenol, 2,4,6-trinitrophcnol and 1-nitroso-2-naphthol. These complexes have been characterized by elemental analysis, electronic and IR spectral analysis, magnetic moment and molar conductance measurements. The IR spectra suggest bonding between the Ni<sup>II</sup> or Cu<sup>II</sup> metal chelate and alkali metal which appear by dative bond via oxygen atoms of C-O (phenolic). Low value of molar conductance would suggest them to be non-electrolyte. These complexes are biologically active against <em>E. coli, S. aureus, C</em>. <em>albicans</em> and so these may be treated as good antibacterial agents and fungicides. It was therefore, thought interesting to synthesize the title compounds and examine their antimicrobial activity.
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32

Mičúch, Peter, Lubor Fišera, Jozef Kožíšek, Alexander Popkov, and Ingrid Svoboda. "The synthesis of chiral NiII complex of Schiff base of (S)-2-N-(N-benzylprolyl)aminobenzophenone and 5-amino-4,5-dihydro-3-(2,4,6-trimethylphenyl)isoxazol-5-carboxylic acid." Arkivoc 2006, no. 5 (2006): 92–99. http://dx.doi.org/10.3998/ark.5550190.0007.509.

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33

Krasikova, Raisa N., Olga F. Kuznetsova, Olga S. Fedorova, Victor I. Maleev, Tatyana F. Saveleva, and Yuri N. Belokon. "No carrier added synthesis of O-(2′-[18F]fluoroethyl)-l-tyrosine via a novel type of chiral enantiomerically pure precursor, NiII complex of a (S)-tyrosine Schiff base." Bioorganic & Medicinal Chemistry 16, no. 9 (2008): 4994–5003. http://dx.doi.org/10.1016/j.bmc.2008.03.040.

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34

Belokon', Yu N., V. I. Maleev, T. F. Savel'eva та ін. "Diastereoselective addition of an NiII complex of a Schiff base of glycine with (S)-2-[N-(N-benzylprolyl)amino]benzophenone to the C=C bond of ethyl α-bromoacrylate". Russian Chemical Bulletin 54, № 4 (2005): 981–87. http://dx.doi.org/10.1007/s11172-005-0344-y.

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35

Saghiyan, A. S., A. V. Geolchanyan, S. M. Djamgaryan, et al. "ChemInform Abstract: Asymmetric Synthesis of S-Alkyl-Substituted (R)-Cysteines via a Chiral NiII Complex of the Schiff′s Base of Dehydroalanine with (S)-2-N-(N-Benzylprolyl)aminobenzophenone." ChemInform 32, no. 5 (2001): no. http://dx.doi.org/10.1002/chin.200105169.

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36

Belokon’, Yuri N., Snieguole M. Motsishkite, Viktor I. Maleev та ін. "Asymmetric Synthesis of (2S,3R)- and (2S,3S)-2-Aminomethyl-3-hydroxy-3-phenylpropanoic Acids via a Chiral NiII Complex of a Schiff Base Prepared from β-Alanine and (S)-2-[-N-(N‘-benzyl)prolylamino]benzophenone". Mendeleev Communications 2, № 3 (1992): 89–91. http://dx.doi.org/10.1070/mc1992v002n03abeh000147.

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37

Yusof, Nasri, Ravoof, and Tiekink. "A Ternary Nickel(II) Schiff Base Complex Containing Di-anionic and Neutral Forms of a Dithiocarbazate Schiff Base." Molbank 2019, no. 2 (2019): M1057. http://dx.doi.org/10.3390/m1057.

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The title NiII complex, Ni(L)(LH2) (1), where LH2 is S-2-methybenzyl-β-N-(2-hydroxy-3-methoxybenzylmethylene) dithiocarbazate, was isolated from the reaction of Ni(acetate)2·4H2O and two molar equivalents of LH2. The complex was characterized by elemental analysis, spectroscopy (IR and UV) as well as by a single-crystal X-ray structure determination. The nickel(II) center is coordinated within a cis-NOS2 donor set that defines a square planar geometry. Three donor atoms, i.e., N, O, and S, are provided by a doubly deprotonated S-2-methybenzyl-β-N-(2-hydroxy-3-methoxybenzylmethylene) dithiocarbazate ligand while the fourth donor, i.e., a thione-S, comes from the neutral form of the dithiocarbazate ligand. In the LH2 ligand, an intramolecular hydroxy-O-H…N(imine) hydrogen bond is found. There is also an intra-ligand, charge assisted amine-N-H…O(phenoxide) hydrogen bond. A notable feature of the molecular packing is the formation of supramolecular chains sustained by π…π stacking interactions whereby the interacting rings are the five- and six-membered chelate and methoxybenzene rings. The chains are connected into a three-dimensional architecture by methyl-C-H…O(methoxy), methoxy-C-H…S(ester), and tolyl-C-H…π(tolyl) interactions.
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38

P., Viswanathamurthi, Kavitha R., and Muthukumar M. "Synthesis and characteristics of NiII and CoII complexes of Schiff base ligands containing triphenylphosphine." Journal of Indian Chemical Society Vol. 85, July 2008 (2008): 735–38. https://doi.org/10.5281/zenodo.5817131.

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Department of Chemistry, Periyar University, Salem-636 011, Tamilnadu, India <em>E-mail :</em> viswanathamurthi@yahoo.com <em>Manuscript received 22 November 2007, revised 16 April 2008, accepted 28 April 2008</em> The reactions of nickel(ll) and cobalt(ll) complexes, [MCI<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub>]&nbsp;(M = Ni or Co) with bidentate Schiff base ligands derived from acetylacetone or benzoylacetone with aniline, <em>o-</em>, <em>m</em>-nitroaniline have been carried out. The complexes were characterized by elemental analysis, spectral (IR, electronic) and cyclic voltammetric studies and are formulated as [MCI(PPh<sub>3</sub>)(L)]&nbsp;(M = Ni or Co; L = bidentate Schiff base ligand). A square planar structure has been tentatively proposed for all the new complexes.
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39

D., Prakash, Kumar C., Prakash S., K. Gupta A., and R. R. P. Singh K. "Synthesis, spectral characterization and antimicrobial studies of some new binuclear complexes of CuII and NiII Schiff base." Journal of Indian Chemical Society Vol. 86, Dec 2009 (2009): 1257–61. https://doi.org/10.5281/zenodo.5823781.

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Department of Chemistry, Patna University, Patna-800 005, Bihar, India <em>Manuscript received 5 May 2008, revised 2 June 2009, accepted 7 July 2009</em> Heterobinuclear alkali metal complexes of Cu<sup>II</sup>&nbsp;or Ni<sup>II</sup>&nbsp;with Schiff base derived from condensation of 1,2- propylenediamine with <em>o</em>-hydroxyacetophenone in 1 : 2 molar ratio have been synthesiled. They were characterized by&nbsp;elemental analysis, IR spectra, UV-visible spectral analysis, magnetic and molar conductance measurements. The synthesized binuclear Cu<sup>II</sup>&nbsp;and Ni<sup>II</sup>&nbsp;complexes of Schiff base are found to have square planar geometry. No change in the stereochemistry of Cu<sup>II</sup>&nbsp;and Ni<sup>II</sup>&nbsp;complexes was observed after formation of adduct with the alkali metal salts of the organic acids. The antimicrobial activity of some of the heterobinuclear complexes are assayed which demonstrated inhibitory effect against some bacteria and fungi.
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40

S., P. Rawat, N. Patel R., and Choudhary M. "Synthesis, electrochemical, antimicrobial and superoxide dismutase activity studies on nickel(II) complexes possessing tris(2-aminoethylamine) and N, O donor benzohydrazide ligands." Journal of Indian Chemical Society Vol. 91, Jun 2014 (2014): 1079–87. https://doi.org/10.5281/zenodo.5722991.

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Department of Chemistry, Awadhesh Pratap Singh University, Rewa-486 003, Madhya Pradesh, India Department of Chemistry, National Institute of Technology Patna, Ashok Rajpath, Patna-800 005, Bihar, India <em>E-mail </em>: mukesh@nitp.ac.in <em>Manuscript received online 16 November 2013, revised 06 January 2014, accepted 06 January 2014</em> Five new nickel(II) complexes viz. [Ni(tren)(L<sup>1</sup>)](ClO<sub>4</sub>)<sub>2</sub> 1; [Ni(tren)(L<sup>2</sup> )](ClO<sub>4</sub> )<sub>2</sub> 2; [Ni(tren)(L<sup>3</sup> )](ClO<sub>4</sub> )<sub>2</sub> 3; [Ni(tren)(L<sup>4</sup> )](ClO<sub>4</sub> )<sub>2 </sub>4; [Ni(tren)(L<sup>5</sup> )](ClO<sub>4</sub>)<sub>2</sub> 5; tren = tris(2-aminoethylamine); L<sup>1</sup> = benzoylhydrazide; L<sup>2</sup> = N-[(1)- 1-(2-methylphenyl)ethylidene]benzohydrazide; L<sup>3</sup> = <em>N</em>-[(1)-1-(4-methylphenyl)ethylidene]benzohydrazide; L<sup>4</sup> = <em>N</em>-[(1)-1- (2-methoxyphenyl)ethylidene]benzohydrazide; L<sup>5</sup> = <em>N</em>-[(1)-1-(4-methoxyphenyl)ethylidene]benzohydrazide; have been synthesized and characterized by partial elemental analysis, FAB (fast atom bombardment), magnetic susc eptibility measurement, electronic absorptions, conductivity measurements and cyclic voltammetry (CV) measurements. All the Schiff base ligands (L<sup>1</sup> -L<sup>5 </sup>) possessing N and O donor sites. Infrared spectra, ligand field spectra and magnetic susceptibility measurements of the complexes 1-5 suggested a distorted octahedral geometry around Ni<sup>II</sup> ion. The redox behavior of the nickel complexes has been studies by cyclic voltammetry and display quasireversible redox wave due to Ni<sup>II</sup>/Ni<sup>I</sup> reduction process. The superoxide dismutase activity reveals that these complexes catalyze the fast disproportionation of superoxide in DMSO solution and<strong> </strong>IC<sub>50</sub> values were evaluated by NBT assay method. <em>In vitro</em> antimicrobial study of these complexes has been assayed against two bacterial strains (<em>Aspergillus</em> and <em>Penicillium</em> sp.) and two fungal strains (<em>Aspergillus and Penicillium</em> sp.) The antimicrobial results indicated that the nickel complexes displayed better antimicrobial activity as compared to the Schiff bases.
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41

Hao, Yu-Mei. "Syntheses, Crystal Structures and Antimicrobial Activity of NiII, ZnII and MnIII Complexes Derived from N,N’-Bis(4-bromosalicylidene)propane-1,2-diamine." Acta Chimica Slovenica 72, no. 1 (2025): 119–26. https://doi.org/10.17344/acsi.2024.9122.

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Four new nickel(II), zinc(II) and manganese(III) complexes, [NiL] (1), [Zn3L2(OAc)2] (2), [ZnL(CH3OH)] (3) and [Mn-ClL(DMF)] (4), derived from the bis-Schiff base N,N’-bis(4-bromosalicylidene)propane-1,2-diamine (H2L) have been prepared and characterized by spectroscopy methods, as well as single crystal X-ray determination. The Ni atom in the mononuclear nickel complex 1 is in square planar coordination. The outer and inner Zn atoms in the trinuclear zinc complex 2 are in square planar and octahedral coordination, respectively. The Zn atom in the mononuclear zinc complex 3 is in square pyramidal coordination. The Mn atom in the mononuclear manganese complex 4 is in octahedral coordination. Antibacterial activity of the complexes has been assayed on the bacteria Staphylococcus aureus and Escherichia coli, and the yeast Candida parapsilosis.
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42

B., H. Mehta, A. Pawanoji A., and A. Shaikh J. "Spectral and magnetic studies of cobalt(II), nickel(II) and palladium(II) metal with bidentate Schiff base ligands." Journal of Indian Chemical Society Vol. 87, Jul 2010 (2010): 779–84. https://doi.org/10.5281/zenodo.5792516.

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Department of Chemistry, University of Mumbai, Vidyanagari, Kalina, Santacruz (E), Mumbai-400 098, India <em>E-mail </em>: bipin_281050@yahoo.com <em>Manuscript received 26 June 2009, revised 7 October 2009, accepted 2 February 2010</em> The divalent metal complexes of cobalt, nickel and palladium have been prepared with bidentate Schiff bases derived by condensing 3-hydroxybenzaldehyde and 5-chlorosalicyladehyde with 4-hydroxybenzhydrazide. The complexes obtained were characterized on the basis of their elemental analysis, magnetic moment, conductance, IR, electronic, <sup>1</sup>H NMR as well as thermal analysis. The cobalt and nickel complexes are paramagnetic exhibiting tetrahedral geometry whereas palladium complexes are diamagnetic showing square planar geometry. Their&nbsp;spectral data revealed that both the Schiff bases behave as bidentate ligands and are coordinated to Co<sup>II</sup>, Ni<sup>II</sup> and Pd<sup>II</sup> via azomethine nitrogen and phenolic oxygen. X-Ray powder diffraction studies suggest orthorhombic crystal system for all the metal complexes.
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43

D., Prakash, Kant Kushwaha, Kumar Birendra, and Prakash S. "Synthesis and antimicrobial studies of binuclear complexes of CuII and NiII metal chelates of Schiff base N,N -ethylenebis(2-hydroxyaretophenonimine) with some organic derivatives of alkaline earth metals." Journal of Indian Chemical Society Vol. 87, Oct 2010 (2010): 1175–78. https://doi.org/10.5281/zenodo.5804877.

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Department of Chemistry, Patna University, Patna-800 005, Bihar, India <em>Manuscript received 5 May 2009, revised 8 February 2010, accepted 29 March 2010</em> A series or new Cu<sup>II</sup> and Ni<sup>II</sup><strong> </strong>binuclear complexes of Schiff base <em>N,N&#39;</em>-ethylencbis(2-hydroxyacetophenonimine) (EA) with some organic derivatives or alkaline earth metals or general formula M<sub>a</sub>EA.M<sub>b</sub>L<sub>2</sub>, where M<sub>a</sub> = Cu or Ni; M<sub>b</sub> = Mg, Ca, Sr or Ba;<strong> </strong>L=&nbsp;deprotonated <em>o</em>-nitrophenol (ONP), 2,4-dinitrophenol (DNP), 2,4,6-trinilrophenol (TNP), 1-nitroso-2-naphthol (1N2N) have been synthesized. The nature of bonding and stereochemistry or the complexes have been deduced by elemental analysis, infrared spectra, electronic spectra, magnetic susceptibility and conductivity measurements. The compounds are tested against Gram +ve bacteria (<em>S. aureus</em>), Gram -ve bacteria (<em>E. coli</em>) and fungi (<em>C. albicans</em>).
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44

Chandan, Kumar. "Synthesis, characterization and biological evaluations of heterobinuclear complexes of CuII and NiII Schiff base of ethylenediamine and o-hydroxyacetophenone with alkali metal salts of o-nitrophenol." Journal of Indian Chemical Society Vol. 94, Aug 2017 (2017): 857–61. https://doi.org/10.5281/zenodo.5595126.

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Department of Chemistry, S. P. College, S. K. M. University, Dumka-814 101, Jharkhand, India <em>E-mail</em> : chandankumar78@yahoo.com <em>Manuscript received 12 November 2016, revised 29 April 2017, accepted 15 May 2017</em> Novel heterobinuclear alkali metal complexes have been synthesized by the interaction of stable Cu<sup>II</sup> and Ni<sup>II</sup> metal chelate of ethylenediamine and <em>o</em>-hydroxyacetophenone with alkali metal salts. The structures of these complexes have been discussed on the basis of elemental analysis, IR and UV-Vis spectral data and magnetic measurement. The Cu<sup>II</sup> and Ni<sup>II</sup> metal chelates act as ligand and coordination towards alkali metal salts takes place through phenolic oxygen atom. The complexes have square planar geometry and there is no change in the stereochemistry of the Ni<sup>2+</sup> and Cu<sup>2+</sup> in the adducts and their metal chelate. The biological analyses of some of heterobinuclear complexes are assayed and demonstrated a general inhibitory effect.
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45

Hopa, Cigdem, and Ismail Cokay. "Designing a heterotrinuclear CuII—NiII—CuIIcomplex from a mononuclear CuIISchiff base precursor with dicyanamide as a coligand: synthesis, crystal structure, thermal and photoluminescence properties." Acta Crystallographica Section C Structural Chemistry 72, no. 8 (2016): 601–6. http://dx.doi.org/10.1107/s205322961600944x.

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Schiff bases are considered `versatile ligands' in coordination chemistry. The design of polynuclear complexes has become of interest due to their facile preparations and varied synthetic, structural and magnetic properties. The reaction of the `ligand complex' [CuL] {H2Lis 2,2′-[propane-1,3-diylbis(nitrilomethanylylidene)]diphenol} with Ni(OAc)2·4H2O (OAc is acetate) in the presence of dicyanamide (dca) leads to the formation of bis(dicyanamido-1κN1)bis(dimethyl sulfoxide)-2κO,3κO-bis{μ-2,2′-[propane-1,3-diylbis(nitrilomethanylylidene)]diphenolato}-1:2κ6O,O′:O,N,N′,O′;1:3κ6O,O′:O,N,N′,O′-dicopper(II)nickel(II), [Cu2Ni(C17H16N2O2)2(C2N3)2(C2H6OS)2]. The complex shows strong absorption bands in the frequency region 2155–2269 cm−1, which clearly proves the presence of terminal bonding dca groups. A single-crystal X-ray study revealed that two [CuL] units coordinate to an NiIIatom through the phenolate O atoms, with double phenolate bridges between CuIIand NiIIatoms. Two terminal dca groups complete the distorted octahedral geometry around the central NiIIatom. According to differential thermal analysis–thermogravimetric analysis (DTA–TGA), the title complex is stable up to 423 K and thermal decomposition starts with the release of two coordinated dimethyl sulfoxide molecules. Free H2Lexhibits photoluminescence properties originating from intraligand (π–π*) transitions and fluorescence quenching is observed on complexation of H2Lwith CuII.
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46

Zahra, Asadi, Asadi Mozaffar, and Khoshkharam Soror. "Thermodynamic studies of adduct formation reactions between organotin(IV)dichlorides and NiII macrocycles." Journal of Indian Chemical Society Vol. 91, May 2014 (2014): 813–22. https://doi.org/10.5281/zenodo.5719986.

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Chemistry Department, College of Sciences, Shiraz University, Shiraz, I.R. Iran <em>E-mail</em> : zasadi@susc.ac.ir, zasadi@shirazu.ac.ir Fax : 98-711-2286008 <em>Manuscript received online 15 October 2013, revised 17 October 2013, accepted 24 October 2013</em> This article presents &sigma;-acceptor strength for the diorganotin(IV)dichlorides : dimethyltindichloride, diphenyltindichloride and dibutyltindichloride as Lewis acids toward some macrocyclic nickel(II) complexes. Thermodynamic of the adducts formation of the tin(IV)dichlorides with Ni(II)tetraaza Schiff base complexes such as : [Ni(Me<sub>4</sub> -Bzo2 [14]- tetraeneN<sub>4</sub><strong> </strong>)], [Ni(Me<sub>4</sub> -4-CH<sub>3</sub>Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub><strong> </strong>)], [Ni(Me<sub>4</sub> -4-ClBzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] and [Ni(Me<sub>2</sub>Ph<sub>2</sub> -Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )], [Ni(Me<sub>2</sub>Ph<sub>2</sub> -4-CH<sub>3</sub>Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )], [Ni(Me<sub>2</sub>Ph<sub>2</sub> -4-ClBzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] that Me<sub>4</sub> -Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub><strong> </strong>denotes : (5,7,12,14-tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclo-tetradecine), was studied in acetonitrile by means of UV-Vis spectrophotometric analysis. The thermodynamic parameters and the formation constant values show the acidity trend for diorganotin(IV)dichlorides as follow : Ph<sub>2</sub> SnCl<sub>2</sub> &gt; Me<sub>2</sub> SnCl<sub>2</sub> &gt; Bu<sub>2</sub> SnCl<sub>2</sub> . Adducts have been synthesized and fully characterized by <sup>1</sup>H NMR, <sup>119</sup>Sn NMR, IR, UV-Vis spectra and elemental microanalysis (C.H.N) methods. The trend of the adduct formation of the nickel complexes with a given tin acceptor decrease as follow : [Ni(Me<sub>4</sub> -4- CH<sub>3</sub>Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] &gt; [Ni(Me<sub>4</sub> -Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] &gt; [Ni(Me<sub>4</sub> -4-ClBzo<sub>2</sub> [14]tetraeneN<sub>4</sub><strong> </strong>)] &gt; [Ni(Me<sub>2</sub>Ph<sub>2</sub> -4- CH<sub>3</sub>Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] &gt; [Ni(Me<sub>2</sub>Ph<sub>2</sub> -Bzo<sub>2</sub> [14]tetraeneN<sub>4</sub> )] &gt; [Ni(Me<sub>2</sub>Ph<sub>2</sub> -4-ClBzo<sub>2 </sub>[14]tetraeneN<sub>4</sub> )].
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47

Sulakshana, Bharti, Choudhary M., P. Rawat Sampat, et al. "Synthetic approach, characterization, superoxide dismutase and antimicrobial activities of imidazolate-bridged CuII-CuII, CuII-NiII and CuII-ZnII binuclear complexes with amino acid derived Schiff bases." Journal of Indian Chemical Society 93, Aug 2016 (2016): 953–64. https://doi.org/10.5281/zenodo.5594776.

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Department of Chemistry, National Institute of Technology, Patna-800 005, Bihar, India <em>E-mail </em>: mukesh@nitp.ac.in Department of Chemistry, Govt. V. P.G. College, Maihar-485 771, Madhya Pradesh, India Department of Chemistry, Govt. S. G. S. P.G. College, Sidhi-486 661, Madhya Pradesh, India Department of Zoology, Govt. U.G. College, Amarpatan-485 775, Madhya Pradesh, India Department of Chemistry, MRSC, University of Coimbra, Coimbra Portugal <em>Manuscript received online 18 March 2016, accepted 28 March 2016</em> Synthetic and characterization of several imidazolato-bridged binuclear transition metal complexes viz. [(L)Cu&shy;Im-Cu(L)]Na 1; [(L)Cu-Im-Ni(L)]Na 2; [(L)Cu-Im-Zn(L)]Na 3; [(L<sup>1</sup>)Cu-Im-Zn(L<sup>1</sup>)]Na 4; [(L<sup>2</sup>)Cu-Im-Zn(L<sup>2</sup>)]Na 5; where H<sub>2</sub>L = (<em>E</em>)-2-(5-bromo-2-hydroxybenzylideneamino) acetic acid ; H<sub>2</sub>L<sup>1</sup> = (<em>S,E</em>)-2-(5-bromo-2-hydroxybenzylideneamino) propanoic acid; H<sub>2</sub>L<sup>2</sup> = (<em>R</em>)-2-(5-bromo-2-hydroxybenzylideneamino)-3-methylbutanoic acid, Im = imidazolate ion, have been described. The value of magnetic moment at room temperature showed that the imidazole group can mediate antiferromagnetic interactions for 1&ndash;5. Amino acids derived Schiff base ligands (H<sub>2</sub>L-H<sub>2</sub>L<sup>2</sup>) were synthesized by the condensation of equimolar (1 : 1) ratio of 5-bromosalicylaldehyde with glycine, alanine and valine, respectively, dissolved in ethanol. Superoxide dismutase activity of all these metal complexes has been revealed to catalyze the dismutation of superoxide (O<sub>2</sub><sup>&ndash;</sup>) and IC<sub>50</sub> values were evaluated. The <em>in vitro </em>antimicrobial activities of metal complexes 1-5 of H<sub>2</sub>L&shy;H<sub>2</sub>L<sup>2</sup> have been investigated and compared with reported complexes.
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48

B., Ramachandra, and Narayana B. "Complexes of Agl, TII, ZnII, PbII, CdII, Hgll, ColI, NiII, RuII, Pdll, Rhlll, RullI and IrIII with 4-salicylideneamino-3-mercapto-1,2,4-triazin( 4H)-5-one." Journal of Indian Chemical Society Vol. 76, May 1999 (1999): 239–42. https://doi.org/10.5281/zenodo.5848668.

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Department of Studies in Chemistry, Mangalore University, Mangalagangothri-574 199, India <em>Manuscript received 11 November 1998, accepted 4 February 1999</em> The complexes of Ag<sup>I</sup>, TI<sup>I</sup>, Zn<sup>II</sup>, Pb<sup>II</sup>, Cd<sup>II</sup>, Hg<sup>II</sup>, Co<sup>II</sup>, Ni<sup>II</sup>, Ru<sup>II</sup>, Pd<sup>II</sup>, Rh<sup>III</sup>, Ru<sup>III</sup> and Ir<sup>III</sup> with 4-salicylidenearnino-3-rnercapto-1,2,4-triazin(4<em>H</em>)-5-one (<strong>SAMT</strong>) have been synthesised. Octahedral structures have been proposed for the CoII, Ni<sup>II</sup>, Ru<sup>II</sup>, Ru<sup>III</sup>, Rh<sup>III</sup> and lr<sup>III</sup> complexes, square-planar for the Pd<sup>II</sup> complex, tetrahedral for the Zn<sup>II</sup>, Cd<sup>II</sup> and Pb<sup>II</sup> complexes and linear polymeric structures for the TI<sup>I</sup> and Ag<sup>I</sup>&nbsp;complexes. The ligand coordinates to the metal ions through thiol sulfur after deprotonation and with azornethine nitrogen. Phenolic oxygen of the ligand is also involved in bonding after deprotonation in few of the complexes.
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49

da Silva, Ana Beatriz, Alex Castro, and Marcelo de Oliveira. "Development of Carbon Paste Electrode Chemically Modified with Schiff Base Complexes for Forensic Analysis of Cocaine." Brazilian Journal of Analytical Chemistry, September 3, 2021. http://dx.doi.org/10.30744/brjac.2179-3425.ar-17-2021.

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In this article we have studied the electrochemical behavior of cocaine hydrochloride on the surface of a carbon paste electrode chemically modified with a Schiff base complex, namely [FeIII(salen)], [ZrOII(salen)], or [NiII(salen)], during voltametric analyses. Among the tested complexes, [NiII(salen)] provided amperometric and thermal stability and it was only degraded at temperatures above 400 ºC. To prepare the cocaine hydrochloride was used hydrochloric acid (HCl 1 mol L-1) after we tested the electrode, the HCl did not cause electrode passivation. In this study we can see that the voltammetric analyses revealed a satisfactory result, that the peak current obtained between 0.1 and 0.2 V (vs. Ag/AgCl) varied linearly with cocaine hydrochloride concentration and the average amperometric sensitivity, the LOD, and the LOQ were 5.5 μmol L-1, 0.945 μmol L-1, and 3.16 μmol L-1, respectively.
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50

Thiam, Mariama, Thierno Moussa Seck, Gorgui Awa Seck, et al. "Syntheses, Characterization and X-ray Crystal Structure of Trinuclear NiII—NaI—NiII Assembled with Salen-type Schiff Base." Earthline Journal of Chemical Sciences, June 3, 2023, 153–66. http://dx.doi.org/10.34198/ejcs.10123.153166.

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The present investigation describes the synthesis and structural study of a metal-zinc ligand [NiL].H2O, which was used to generate a trinuclear complex formulated as {Ni(m-L)Na(m-L)Ni}.(SCN)0.6.(Cl)0.4. The title compound crystallizes in the tetragonal space group I41/acd with the following unit cell parameters: a = 185403(5) Å, c = 51.925(2) Å, V = 17849.0(3) Å3, Z = 16, R1 = 0.074 and wR2 = 0.209. Each organic molecule acts as a hexadentate ligand and bridges Ni(II) and Na(I). For both Ni(II) cations the coordination environment around the metal center can be described as distorted square planar. The Na(I) cation is eight coordinated and the polyhedron around the sodium ions is best described as a distorted square anti-prism. The means planes of the two phenyl rings with a methoxy substituent form a dihedral angle of 3.870(4)°, while the dihedral angle values of these mean planes with the means plane of the central phenyl ring are, respectively, 11.233(4)° and 14.138(3)°. The Zn–Na distance is 3.4285(7) Å. Weak hydrogen bonds involving C—H as donor and Cl, S or O as acceptor are observed.
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