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Journal articles on the topic 'Structure of Divalent Metal Complexes'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Almehizia, Abdulrahman A., Hamad M. Alkahtani, Mohamed A. Al-Omar, et al. "Synthesis, Spectroscopic Characterization and Thermal Studies of Polymer–Metal Complexes Derived from Modified Poly Styrene-Alt-(Maleic Anhydride) as a Prospects for Biomedical Applications." Crystals 13, no. 5 (2023): 728. http://dx.doi.org/10.3390/cryst13050728.

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Eight polymer-metal complexes were synthesized from complexation of divalent Mn(II), Ni(II), Co(II), and Cu(II) metal ions with modified polystyrene-alt-(maleic anhydride) (PSMAP and PSMAM) ligands. The structures of these new complexes were characterized using a variety of techniques, including magnetic moment susceptibility, conductance measurements, FT-IR spectroscopy, ultraviolet-visible (UV-VIS), thermogravimetric analysis (TGA), as well as scanning electron microscopy (SEM). All metal-polymer complexes have a non-electrolytic nature based on conductance measurements. The polymer molecule

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2

Rehman, S. U., S. Noreen, Miss Rashida, et al. "STRUCTURAL ELUCIDATION OF TRANSITION METAL COMPLEXES OF MODIFIED DIAMINE ALONGWITH BIOASSAY STUDIES." Nucleus 46, no. 4 (2020): 501–6. https://doi.org/10.71330/thenucleus.2009.927.

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A number of complexes of modified diamine (3,7-dimethyl-1,5-dithia-3,7-diazacyclooctane), were prepared with first row divalent transition metals, i.e., Cu(II) and Zn(II). The structures of these complexes were elucidated on the basis of various physical techniques such as mass spectrometry, NMR, IR, UV-Visible spectroscopies, magnetic and conductance measurements. Bioassay of these complexes has also been carried out. The physical measurements confirm distorted tetrahedral structure for these complexes.

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3

HITOSHI, OHTAKI. "Structure of Divalent Metal Complexes with Halide and Thiocyanate Ions in Solution." Journal of Indian Chemical Society Vol. 69, Aug 1992 (1992): 442–57. https://doi.org/10.5281/zenodo.6017789.

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Coordination Chemistry Laboratories, Institute for Molecular Science, Okazaki National Research Institutes, Myodaiji-cho, Okazaki, 444 japan <em>Manuscript received 26 February 1991</em>  Structural changes occurring during stepwise formation of halido and thiocyanato complexes of some bivalent metal ions in aqueous and nonaqueous solutions are discussed on the basis of spectroscopic, calourimetric and solution X ray diffraction data. The structures of the complexes [MX<sub>n</sub>]<strong>,</strong><sup>(2- \(n\))+</sup><strong><sup> </sup></strong>(\(n\)=1-4)<strong>

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4

Nantsis, Evangelos A., and W. Robert Carper. "Molecular structure of divalent metal ion–fulvic acid complexes." Journal of Molecular Structure: THEOCHEM 423, no. 3 (1998): 203–12. http://dx.doi.org/10.1016/s0166-1280(97)00125-5.

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5

Bouicha, Mohamed Achraf, Chama Mabrouk, Bouzid Gassoumi, et al. "New zinc(ii) metalloporphyrin: molecular structure, spectroscopic characterization, electrochemical sensing of dopamine, and catalytic dye degradation." RSC Advances 15, no. 13 (2025): 9810–27. https://doi.org/10.1039/d5ra00762c.

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6

Sawant, Dilip C., A. Venkatchallam, and R. G. Deshmukh. "Synthesis and Characterization of a NewN"-[(1Z,2E)-2- (Hydroxyimino)-1-phenylpropylidene]-N"'-[(1E)-phenylmethylene]thiocarbonohydrazide and its Complexes with Co(II), Ni(II) and Cu(II)." E-Journal of Chemistry 7, no. 2 (2010): 409–18. http://dx.doi.org/10.1155/2010/525197.

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Synthesis and characterization of a newN"-[(1Z,2E)-2- (Hydroxyimino)-1-phenylpropylidene]-N"'-[(1E)-phenylmethylene]thiocarbonohydrazide and its metal complexes with Co(II), Ni(II) and Cu(II) metal ions. The ligand synthesis and characterization is reported for first time. The complexes of divalent metal ions were synthesized in 1:2 molar proportion using ethanol as solvent. The ligands as well as its metal complexes were characterized using various physicochemical techniques such as elemental analysis, spectral and magnetic measurements and electrical conductivity measurements in case of the

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7

Sbîrnă, Liana Simona, and Clementina Moldovan. "Comparison between the chemical behaviors of different complex compounds formed by divalent transition metal ions with a heterocyclic ligand, leading to different structures." Annals of the University of Craiova Series Chemistry 28, no. 1 (2022): 28–39. http://dx.doi.org/10.52846/aucchem.2022.1.03.

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The main purpose of the present paper is to identify the structures for the complexes formed by six divalent transitional metal ions (namely Ni(II), Pd(II), Pt(II), Zn(II), Cd(II) and Hg(II)) with the same heterocyclic ligand, that is able to change the coordination manner, consequently affecting the structure of the respective complex compound.

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8

Ibrahim, Said A., Sahar A. El-Gyar, Aly A. Abdel-Hafez, and Mostafa K. Rabia. "Divalent Transition Metal Complexes of Potentially Polynucleating 8-Hydroxyquinoline-5-sulfonyl Hydrazone." Collection of Czechoslovak Chemical Communications 59, no. 8 (1994): 1800–1808. http://dx.doi.org/10.1135/cccc19941800.

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The Co(II), Ni(II), Cu(II) and Zn(II) complexes with 8-hydroxyquinoline-5-sulfonylhydrazone are described. It has been found that the ligand can coordinate to metal ion as a monobasic bidentate chelating agent and it can form di- and trinuclear complexes while acting as a dibasic tetradentate one. The structure of the isolated complexes have been suggested on the basis of elemental analysis, IR, 1H NMR spectroscopy and conductivity measurements. The complexes are all formulated as four-coordinate. Some complexes showed enhanced antimicrobial activity relative to the free ligand.

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9

Bettinger, Reuben T., Philip J. Squattrito, Darpandeep Aulakh, and Christopher G. Gianopoulos. "Crystal structures of two new divalent transition-metal salts of carboxybenzenesulfonate anions." Acta Crystallographica Section E Crystallographic Communications 78, no. 9 (2022): 961–65. http://dx.doi.org/10.1107/s2056989022008295.

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Hexaaquanickel(II) bis(3-carboxy-4-hydroxybenzenesulfonate) dihydrate, [Ni(H2O)6][C6H3(CO2H)(OH)SO3]2·2H2O, (I), crystallizes in the triclinic space group P\overline{1} with the nickel(II) aqua complexes on centers of inversion. The carboxylate group is protonated and neither it nor the sulfonate group is involved in direct coordination to the metal ions. The structure consists of alternating layers of inorganic cations and organic anions linked by O—H...O hydrogen bonds that also include non-coordinated water molecules of crystallization. The first-row divalent transition-metal salts of this

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10

Myers, Thomas W., Tobias J. Sherbow, James C. Fettinger, and Louise A. Berben. "Synthesis and characterization of bis(imino)pyridine complexes of divalent Mg and Zn." Dalton Transactions 45, no. 14 (2016): 5989–98. http://dx.doi.org/10.1039/c5dt01541c.

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The synthesis and electronic structure of bis(imino)pyridine (I<sub>2</sub>P) complexes of the divalent metal ions, Zn(ii) and Mg(ii) are reported, and a correlation between the ligand C<sub>im</sub>–C<sub>py</sub> bond lengths with the ligand torsion angle is described. Structural comparison with a new complex of Al(iii) and previously reported Al(iii) complexes is included.

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11

Shalinee and Sanjay Kumar. "Heterocyclic Schiff Base Complexes of Bivalent Transition Metals: Microwave-Assisted Green Synthesis, Structure Elucidation and Antimicrobial Studies." Chemical Science International Journal 33, no. 5 (2024): 41–51. http://dx.doi.org/10.9734/csji/2024/v33i5915.

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A heterocyclic Schiff base ligand [LH] namely {5‐[(E)‐[(1H‐pyrrol‐2‐yl)methylidene]amino]‐ 1,3,4‐thiadiazole‐2‐thiol}(NNN donor) and its divalent transition metals (Co2+, Ni2+, Cu2+ and Zn2+) mononuclear complexes were synthesised efficiently in relatively very short times (from one-two hours to 6-15 minutes) with higher yields [from 59% (conventional method) to 90% (green method)] by microwave-assisted greener process is presented here. The ligand and its complexes were characterised by elemental analysis, molar conductance, and magnetic susceptibility measurements and spectroscopic (IR, elec

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12

Venkatchallam, A., R. G. Deshmukh, and Dilip C. Sawant. "Synthesis and Characterization of 2-(Hydroxyimino)-1-(phenylpropylidene)thiocarbonohydrazide and its Metal Complexes with Co(II), Ni(II) and Cu(II) Ions." E-Journal of Chemistry 6, no. 4 (2009): 993–1002. http://dx.doi.org/10.1155/2009/591353.

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Synthesis and characterization of 2-(hydroxyimino)-1-(phenyl propylidene) thiocarbonohydrazide (called ‘HPTCHOPD’) was studied. The synthesized compound having the molecular formula C10H13N5OS, where in isonitrosopropiophenone is reacted with thiocarbonohydrazide in presence of sodium acetate in ethanol-water mixture. The yield which is comprises effecting the reaction in the presence of sodium acetate. Also the present work report a process for producing metal complexes having the formula ML2and (ML)2Cl, wherein M is the divalent metal cation, like cobalt (Co+2), nickel (Ni+2) and copper (Cu+

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13

Rathee, Nitu, and Krishan Verma. "Studies on nickel (II) and palladium (II) complexes with some tetraazamacrocycles containing tellurium." Journal of the Serbian Chemical Society 77, no. 3 (2012): 325–33. http://dx.doi.org/10.2298/jsc101211200r.

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The synthesis of 10-membered and 12-membered tellurium containing tetraazamacrocyclic complexes of divalent nickel and palladium by template condensation of diaryltellurium dichlorides, (aryl = p-hydroxyphenyl, 3-methyl-4-hydroxyphenyl, p-methoxyphenyl) with 1,2-diaminoethane and 1,3-diaminopropane in the presence of metal dichloride is reported. The resulting complexes have been subjected to elemental analyses, magnetic measurements, electronic absorption, infra-red, and proton magnetic resonance spectral studies. The formation of proposed macrocyclic skeletons and their donor sites have been

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14

Sidorov, Alexey A., Mikhail A. Kiskin, Alexander E. Baranchikov, Vladimir K. Ivanov, and Igor L. Eremenko. "Methods for Synthesis of Molecular Materials with Unique Physical Properties." Vestnik RFFI, no. 2 (June 25, 2019): 82–100. http://dx.doi.org/10.22204/2410-4639-2019-102-02-82-100.

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The authors discovered and investigated new types of stable heterometallic carboxylate complexes in which divalent transition metal atoms of the 4th period of the Periodic Table of Chemical Elements (V, Co, Ni, Cu, Zn) combine with atoms of lithium, magnesium, calcium or rare earth elements. These polynuclear heterometallic compounds retain their structure under conditions when the homometallic compounds of these transition metals decompose to mononuclear complexes. The different metals combination in one molecule allows us to use the obtained heterometallic compounds for producing disperse an

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15

A., C. HIREMATH, V. HUGGI N., and B. HALLI M. "Studies on some Divalent Metal Complexes of 2,3-Substituted-benzofuran Derivatives." Journal of Indian Chemical Society Vol. 64, Jul 1987 (1987): 385–88. https://doi.org/10.5281/zenodo.6159449.

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Department of Chemistry, Gulbarga University, Gull:large-585 106 <em>Manuscript recesved 5 October 1989, revssed 1 April 1987, accepted 5 June 1987</em> The complexes of Co<sup>II</sup>, NI<sup>II</sup>, Cu<sup>ll</sup>, Zn<sup>II</sup>, Cd<sup>II</sup> and Hg<sup>II</sup> with 3-amino-2-benzofurancarbonitrile (L) and 3-amino-2-benzofuranthiocarboxamide (L') have been prepared and characterised on the basis of elemental analyses, molar conductance, magnetic moment, electronic and infrared spectral data. The various ligand field parameters like <em>Dq, B', </em>LFSE <em>etc. <

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16

Yuan, Qinqin, Xiang-Tao Kong, Gao-Lei Hou, Ling Jiang, and Xue-Bin Wang. "Electrospray ionization photoelectron spectroscopy of cryogenic [EDTA·M(ii)]2− complexes (M = Ca, V–Zn): electronic structures and intrinsic redox properties." Faraday Discussions 217 (2019): 383–95. http://dx.doi.org/10.1039/c8fd00175h.

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17

Jurca, Titel, Sarah Ouanounou, Wei-Chih Shih, et al. "Structural and electronic trends for five coordinate 1st row transition metal complexes: Mn(ii) to Zn(ii) captured in a bis(iminopyridine) framework." Dalton Transactions 45, no. 36 (2016): 14327–34. http://dx.doi.org/10.1039/c6dt02598f.

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A series of divalent bis(iminopyridine) complexes {2,6-[PhCN(tBu<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)]<sub>2</sub>C<sub>5</sub>H<sub>3</sub>N}MBr<sub>2</sub> provided a unique system for investigating the correlation of experimental structure and electronic structure analysis.

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18

Aslam, Muhammad. "SYNTHESIS, SINGLE CRYSTAL X-RAY AND BIOLOGICAL STUDY OF TRANSITION METAL COMPLEXES OF N, N-DONOR SCHIFF BASE LIGAND: N1 , N2 -BIS[(4-METHOXYPHENYL) METHYLIDENE]-1,2-ETHANEDIAMINE." Biomedical and Clinical Research 2, no. 4 (2023): 01–06. https://doi.org/10.31579/2834-8486/011.

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A Schiff base ligand, N 1 , N2 -bis[(4-methoxyphenyl) methylidene]-1,2-ethanediamine (SBL), was derived by the condensation of 4-methoxybenzaldehyde with ethylene diamine followed by complexation with divalent transition metals. The synthesized Schiff base ligand (SBL) and its complexes 1-5 were characterized on the basis of IR, 1H-NMR, 13C-NMR, MS spectral, molar conductance and elemental analyses data. The structure of Schiff base ligand (SBL) was also confirmed by single crystal x-ray crystallographic study. The conductivity data suggests non-electrolytic nature of these complexes. The comp

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19

Guo, Ge, Xiaolu Wu, Xiangqian Yan та ін. "Unprecedentedly High Activity and/or High Regio-/Stereoselectivity of Fluorenyl-Based CGC Allyl-Type η3:η1-tert-Butyl(dimethylfluorenylsilyl)amido Ligated Rare Earth Metal Monoalkyl Complexes in Olefin Polymerization". Polymers 11, № 5 (2019): 836. http://dx.doi.org/10.3390/polym11050836.

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A series of fluorenyl-based constrained-geometry-configuration (CGC) allyl-type rare earth metal monoalkyl complexes bearing the divalent anionic η3:η1-tert-butyl(dimethylfluorenylsilyl)amido (η3:η1-FluSiMe2NtBu) ligand (η3:η1-FluSiMe2NtBu)Ln(CH2SiMe3)(THF)2 (1–3) have been synthesized via the alkane elimination reaction between the FluHSiMe2NHtBu ligand and rare earth metal tri(trimethylsilylmethyl) complexes Ln(CH2SiMe3)3(THF)n. Their structures are characterized by means of NMR spectrum, elemental analyses, and X-ray diffraction. These complexes 1–3 are isostructural and isomorphous, and ea

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20

Makarova, Anastasiya O., Svetlana R. Derkach, Tahar Khair, Mariia A. Kazantseva, Yuriy F. Zuev, and Olga S. Zueva. "Ion-Induced Polysaccharide Gelation: Peculiarities of Alginate Egg-Box Association with Different Divalent Cations." Polymers 15, no. 5 (2023): 1243. http://dx.doi.org/10.3390/polym15051243.

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Structural aspects of polysaccharide hydrogels based on sodium alginate and divalent cations Ba2+, Ca2+, Sr2+, Cu2+, Zn2+, Ni2+ and Mn2+ was studied using data on hydrogel elemental composition and combinatorial analysis of the primary structure of alginate chains. It was shown that the elemental composition of hydrogels in the form of freezing dried microspheres gives information on the structure of junction zones in the polysaccharide hydrogel network, the degree of filling of egg-box cells by cations, the type and magnitude of the interaction of cations with alginate chains, the most prefer

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21

Zhang, Dapeng, and Naoki Kishimoto. "Theoretical Analysis of Coordination Geometries in Transition Metal–Histidine Complexes Using Quantum Chemical Calculations." Molecules 29, no. 13 (2024): 3003. http://dx.doi.org/10.3390/molecules29133003.

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A theoretical investigation utilizing density functional theory (DFT) calculations was conducted to explore the coordination complexes formed between histidine (His) ligands and various divalent transition metal ions (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+). Conformational exploration of the His ligand was initially performed to assess its stability upon coordination. Both 1:1 and 1:2 of metal-to-ligand complexes were scrutinized to elucidate their structural features and the relative stability of the complexes. This study examined the ability of His to act as a bidentate or tridentate coordin

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22

Zhang, Naixin, Qunyan Wu, Jianhui Lan, Weiqun Shi, and Congzhi Wang. "Theoretical Prediction of Divalent Actinide Borozene Complexes." Molecules 29, no. 23 (2024): 5815. https://doi.org/10.3390/molecules29235815.

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The aromatic boron cluster B82– (D7h) has similar π bonding to C6H6, which is named “borozene”. The B82– ligand has been observed to stabilize monovalent Ln(+I) in C7v-LnB8− (Ln = La, Pr, Tb, Tm, and Yb) borozene complexes. Low-valency actinide complexes have been reported more rarely, and B82– may be one of the potential ligands. Here, we report a theoretical study on a series of actinide metal-doping octa-boron clusters AnB8 (An = Pa, U, Np, and Pu). It was found that each species has both half-sandwich and chair-like structures. Except for PaB8, the half-sandwich structures of UB8, NpB8, an

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23

Sharma, J., D. Kumar, A. Garg, I. Sharma, and N. Sharma. "SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL SCREENING OF Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) IONS WITH SCHIFF BASE POSSESSING THIOSEMICARBAZONE MOIETY." Rasayan Journal of Chemistry, Special (2021): 200–205. http://dx.doi.org/10.31788/rjc.2021.1456662.

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Para-chlorobenzaldehyde and thiosemicarbazide react in 1:1 molar ratio in MeOH and form the Schiff base, LH (1). The Schiff base reacts with divalent Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) ions in 1:2 molar ratio in MeOH and forms the corresponding non-electrolytic, monomeric metal complexes, [MnL2(MeOH)2](2), [ML2] (3, M = Ni, Zn) and [ML2] (4, M = Co, Cu) respectively. The stereochemistry of Coordination compounds has been reported on the basis of elemental analyses, magnetic susceptibility and molar conductance, IR, electronic and 1H NMR spectral studies. The synthesized Schiff base and

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24

David, G. Calatayud, López-Torres Elena, Antonia Mendiola M., J. Pastor César, and R. Procopio Jesús. "Structural Trends in Divalent Benzil Bis(thiosemicarbazone) Complexes." European Journal of Inorganic Chemistry 2005 (September 19, 2005): 4401–9. https://doi.org/10.1002/ejic.200500363.

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Redox-related changes in the biological properties of copper bis(thiosemicarbazones) are induced by the backbone of the ligand. To get information about how these changes depend on the structural parameters, three X-ray structures of complexes with different behaviour of the benzil bis(thiosemicarbazone) ligand have been determined. These include two almost planar copper(II) complexes with different grades of deprotonation in the ligand and a Zn<sup>II</sup> complex in which the ligand acts as a monoanion and a nitrate group is bonded to the metal ion in a square-based pyramid. The changes in

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25

Arablo, Naser, S. Ali Asghar Torabi, Ali Morsali, Brian W. Skelton, and Allan H. White. "Cation Structures in Bis(2-Guanidino-benzimidazole)metal(II) Complexes: Crystal and Molecular Structure of the Copper(II) Perchlorate Adduct." Australian Journal of Chemistry 56, no. 9 (2003): 945. http://dx.doi.org/10.1071/ch03017.

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Following previous studies of [M(gbH)2](NO3)2 (M = Ni(II), Zn(II), gbH = 2-guanidinobenzimidazole) a low temperature single-crystal X-ray study of [Cu(gbH)2](ClO4)2·H2O enables a comparison of the impact of the different electron configurations of these divalent metals on the overall cation geometries.

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26

Singh, Sarita, Jyoti Singh, Sunita Gulia, and Rita Kakkar. "Metal Ion Selectivity of Kojate Complexes: A Theoretical Study." Journal of Theoretical Chemistry 2013 (July 7, 2013): 1–9. http://dx.doi.org/10.1155/2013/342783.

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Density functional calculations have been performed on four-coordinate kojate complexes of selected divalent metal ions in order to determine the affinity of the metal ions for the kojate ion. The complexation reactions are characterized by high energies, showing that they are highly exothermic. It is found that Ni(II) exhibits the highest affinity for the kojate ion, and this is attributed to the largest amount of charge transfer from the ligand to the metal ion. The Ni(II) complex has distorted square planar structure. The HOMOs and LUMOs of the complexes are also discussed. All complexes di

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27

Reiss, Aurora, Mariana Carmen Chifiriuc, Emilia Amzoiu, and Cezar Ionuţ Spînu. "Transition Metal(II) Complexes with Cefotaxime-Derived Schiff Base: Synthesis, Characterization, and Antimicrobial Studies." Bioinorganic Chemistry and Applications 2014 (2014): 1–17. http://dx.doi.org/10.1155/2014/926287.

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New [ML2(H2O)2] complexes, where M = Co(II), Ni(II), Cu(II), and Zn(II) while L corresponds to the Schiff base ligand, were synthesized by condensation of cefotaxime with salicylaldehydein situin the presence of divalent metal salts in ethanolic medium. The complexes were characterized by elemental analyses, conductance, and magnetic measurements, as well as by IR and UV-Vis spectroscopy. The low values of the molar conductance indicate nonelectrolyte type of complexes. Based on spectral data and magnetic moments, an octahedral geometry may be proposed for Co(II), Ni(II), and Zn(II) complexes

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28

Chojnacka, Maja W., Jeanette A. Adjei, Alan J. Lough, Guerino G. Sacripante та Robert A. Gossage. "Transition metal complexes of monodentate 2-oxazolines containing long chain alkyl groups. The crystal structure of trans-PdCl2(κ1-N-rac-2-heptadecyl-4,5-dihydro-5-methyl-2-oxazole)2". Zeitschrift für Naturforschung B 75, № 4 (2020): 371–77. http://dx.doi.org/10.1515/znb-2019-0212.

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AbstractThe synthesis, characterisation and properties of several divalent metal complexes (Co, Ni, Pd) containing 2-oxazoline ligands L1–L3, appended with long chain alkyl and/or ester groups, is reported. The X-ray crystal structure aspects of one such complex, trans-PdCl2(rac-2-heptadecyl-4,5-dihydro-5-methyl-2-oxazole)2 (i.e. PdCl2(L1)2: 3), is described. This latter material contains one of the longest alkyl chains to be crystallographically characterised appended to an oxazoline ligand. The complexes reported herein represent the first transition metal derivatives of these high molecular

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29

Abdou, Safaa N., Abeer A. Faheim, and Abdel-Nasser M. A. Alaghaz. "Synthesis, spectral characterization, cyclic voltammety, molecular modeling and catalytic activity of sulfa-drug divalent metal complexes." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 2 (2014): 2234–45. http://dx.doi.org/10.24297/jac.v10i2.5489.

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Complexes of cobalt(II), nickel(II), copper(II), zinc(II) and Hafnium(II) of general composition [M(L)2(Cl)2] have been synthesized [L = 4-(phenylphosphinylideneamino-N-thiazolylbenzenesulfonamide]. The elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, IR, UV, NMR, SEM, EDX, thermal and EPR spectral studies of the compounds led to the conclusion that the ligand acts as a bidentate manner. The molar conductance of the complexes in fresh solution of DMSO lies in the range of 7.46–9.13 Ω-1 cm2mol‒1 indicating their non-electrolytic behavior. On the ba

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30

Rashad, Alaa A., Farah Muaiad, Ahmed Ahmed, EkhlasA Salman, and Evon Akram. "Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base." Baghdad Journal of Biochemistry and Applied Biological Sciences 1, no. 01 (2020): 5–16. http://dx.doi.org/10.47419/bjbabs.v1i01.24.

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Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between 4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and 2-hydroxy-1-

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31

Rashad, Alaa A., Farah Muaiad, Ahmed Ahmed, Ekhlas A. Salman, and Evon Akram. "Synthesis and Photophysical Study of Divalent Complexes of Chelating Schiff Base." Baghdad Journal of Biochemistry and Applied Biological Sciences 1, no. 01 (2020): 5–16. http://dx.doi.org/10.47419/bjbabs.v1i01.27.

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Background: Schiff base compounds derivative from1,2,4-triazole, and their transition metal complexes play an essential role in coordination and bioinorganic chemistry due to biological and industrial applications. Objective: The work aims to prepare and characterize of 1, 2, 4-triazole Schiff base and its complexes with a theoretical study using PM3 calculation and HyperChem program, photophysical properties, and surface morphology for these complexes. Methods: 1, 2, 4-triazole Schiff base prepared by condensation reaction between 4-Amino-3-mercapto-5-phenyl-4H-1,2,4-triazole and

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32

Brajesh, Kumar, K. Sangal S., and Kumar Arun. "Synthesis, magnetic and spectral studies of copper(II) complexes of 2-substituted benzaldehyde semicarbazones and thiosemicarbazones." Journal of Indian Chemical Society Vol. 86, Oct 2009 (2009): 1038–41. https://doi.org/10.5281/zenodo.5820322.

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Department of Chemistry, Meerut College, Meerut-250 001, Uttar Pradesh, India <em>Manuscript received 18 January 2006, revised 12 January 2009, accepted 8 June 2009</em> Some complexes of divalent copper have been synthesized by refluxing the metal salts with the ligands 2- chlorobenzaldehyde semicarbazone/thiosemicarbazone (cbsc, cbtsc) and 2-ethoxybenzaldehyde semicarbazone/ thiosemicarbazone (ebsc, ebtsc). All these complexes are characterized on the basis of elemental analysis, magnetic susceptibility measurements, IR and electronic spectral studies. IR spectral data of the complexes revea

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Smith, Graham, Eric J. O'Reilly, and Colin H. L. Kennard. "Structures of the divalent metal complexes with benzene-1,2-dioxydiacetic acid." Polyhedron 6, no. 5 (1987): 871–79. http://dx.doi.org/10.1016/s0277-5387(00)80928-6.

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Konarev, D. V., S. S. Khasanov, D. V. Lopatin, V. V. Rodaev, and R. N. Lyubovskaya. "Fullerene complexes with divalent metal dithiocarbamates: structures, magnetic properties, and photoconductivity." Russian Chemical Bulletin 56, no. 11 (2007): 2145–61. http://dx.doi.org/10.1007/s11172-007-0339-y.

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35

Frandsen, Paul B., Madeline G. Bursell, Adam M. Taylor, Seth B. Wilson, Amy Steeneck, and Russell J. Stewart. "Exploring the underwater silken architectures of caddisworms: comparative silkomics across two caddisfly suborders." Philosophical Transactions of the Royal Society B: Biological Sciences 374, no. 1784 (2019): 20190206. http://dx.doi.org/10.1098/rstb.2019.0206.

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Caddisfly (Trichoptera) larvae assemble a variety of underwater structures using bioadhesive silk. The order is divided into two primary sub-orders distinguished by how the larvae deploy their silk. Foraging Integripalpia larvae construct portable tube cases. Annulipalpia larvae construct stationary retreats, some with suspended nets to capture food. To identify silk molecular adaptations that may have contributed to caddisfly diversification, we report initial characterization of silk from a net-spinner genus, Parapsyche, for comparison with the silk of a tube case-maker genus, Hesperophylax

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Divya, Bartaria, Sinha S., and Krishna V. "Formation and stability of heterobinuclear complexes containing HgII and divalent metal ions with EDT A and CDTA." Journal of Indian Chemical Society Vol. 83, Feb 2006 (2006): 198–200. https://doi.org/10.5281/zenodo.5816853.

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Depanment of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : vkrishna_alld@rediffmail.com <em>Manuscript received 27 May 2004, revised 5 October 2005. accepted 27 October 2005</em> The stability constants for the heterobinuclear complexes or the type HgLM (L = EDT A or CDT A (trans 1,2-diaminocyclohexaue tetracetic acid) and M = Be, Mg, Ca, Pb, Cd, Mn, Co, Ni, Cu) have been determined by computer analysis or the pH titration data. The results are discussed to obtain the solution structures of the above mixedmetal complexes.  

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El-Megharbel, Samy M., Najah M. Al-Baqami, Eman H. Al-Thubaiti, Safa H. Qahl, Bander Albogami, and Reham Z. Hamza. "Antidiabetic Drug Sitagliptin with Divalent Transition Metals Manganese and Cobalt: Synthesis, Structure, Characterization Antibacterial and Antioxidative Effects in Liver Tissues." Current Issues in Molecular Biology 44, no. 5 (2022): 1810–27. http://dx.doi.org/10.3390/cimb44050124.

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Metals and their complexes have an increasing number of medical applications. Sitagliptin (STG) acts as an antidiabetic drug. Mn(II) and Co(II) complexes were studied and characterized based on physical characterization, FT-IR, DG/TG, XRD, ESM, and TEM. Data revealed that STG acts as a bidentate ligand through the oxygen atom of a carbonyl group and the nitrogen atom of an amino group. Magnetic measurement data revealed that the Mn/STG metal complex has a square planner geometry. The experiment was performed on 40 male albino rats who were divided into four groups: the control group, STG group

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Dodds, Christopher A., Alan R. Kennedy, and Mark D. Spicer. "N-Heterocyclic Germylenes: Structural Characterisation of Some Heavy Analogues of the Ubiquitous N-Heterocyclic Carbenes." Heteroatom Chemistry 2019 (January 23, 2019): 1–8. http://dx.doi.org/10.1155/2019/9178371.

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The X-ray crystal structures of three N-heterocyclic germylenes (NHGes) have been elucidated including the previously unknown 1,3-bis(2,6-dimethylphenyl)diazagermol-2-ylidene (1). In addition, the X-ray crystal structures of the previously synthesised 1,3-bis(2,4,6-trimethylphenyl)diazagermol-2-ylidene (2) and 1,3-bis(2,6-diisopropylphenyl)diazagermol-2-ylidene (3) are also reported. The discrete molecular structures of compounds 1 to 3 are comparable, with Ge-N bond lengths in the range 1.835-1.875 Å, while the N-Ge-N bond angles range between 83.6 and 85.2°. Compound 2 was compared to the an

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Zhou, Ying-Hua, Jian Chen, Yong-Jia Shang, and Yong Cheng. "Synthesis, structure and property of three divalent metal complexes of the piperidinoacetyl-containing calix[4]arene." Journal of Inclusion Phenomena and Macrocyclic Chemistry 74, no. 1-4 (2012): 343–51. http://dx.doi.org/10.1007/s10847-012-0121-0.

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Duan, Wubiao, Keiichi Satoh, and Kiyoshi Sawada. "Stability and Structure of Ethylenedinitrilopoly(methylphosphonate) Complexes of the Divalent Transition Metal Ions in Aqueous Solution." Bulletin of the Chemical Society of Japan 74, no. 3 (2001): 487–93. http://dx.doi.org/10.1246/bcsj.74.487.

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Salh, Hala M., and Taghreed H. Al-Noor. "Preparation, Structural Characterization and Biological Activities of Curcumin-Metal(II)-L-3,4-dihydroxyphenylalanin (L-dopa) complexes." Ibn AL-Haitham Journal For Pure and Applied Sciences 36, no. 1 (2023): 170–85. http://dx.doi.org/10.30526/36.1.2899.

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In the present work, a first-row divalent d-transition metal obtained from curcumin(Curc) and L-3,4-dihydroxyphenylalanin(L-dopa)have been synthesized which their complexes and characterized by C.H.N, conductance, spectral methods: FT-IR, Ultra–Visible. Magneto-chemical measurements, molar conductance ΛM (1×10−3 mol/L in DMSO):36- 0.84 ohm-1.cm2.mol-1 (non-electrolyte). The data shows that the complexes have the structure [M((II))-(Curc)-(L-dopa)] system. Electronic and magnetic data suggest an octahedral geometry for all complexes in which the (L-dopa) and curcumin act as bidentate ligands. C

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Zhang, Yao, Jie Li, Guoyu Ren, Baofu Qin, and Haixia Ma. "Synthesis, crystal structure and antifungal activity of a divalent cobalt(II) complex with uniconazole." Acta Crystallographica Section C Structural Chemistry 72, no. 6 (2016): 485–90. http://dx.doi.org/10.1107/s2053229616007750.

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Azole compounds have attracted commercial interest due to their high bactericidal and plant-growth-regulating activities. Uniconazole [or 1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pent-1-en-3-ol] is a highly active 1,2,4-triazole fungicide and plant-growth regulator with low toxicity. The pharmacological and toxicological properties of many drugs are modified by the formation of their metal complexes. Therefore, there is much interest in exploiting the coordination chemistry of triazole pesticides and their potential application in agriculture. However, reports of complexes of u

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Bazzicalupi, Carla, Craig Grimmer, and Igor Vasyl Nikolayenko. "Old Acquaintances and Novel Complex Structures for the Ni(II) and Cu(II) Complexes of bis-Chelate Oxime–Amide Ligands." Molecules 29, no. 2 (2024): 522. http://dx.doi.org/10.3390/molecules29020522.

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In the process of systematically studying the methylhydroxyiminoethaneamide bis-chelate ligands with polymethylene spacers of different lengths, L1–L3, and their transition metal complexes, a number of new Ni(II) and Cu(II) species have been isolated, and their molecular and crystal structures were determined using single-crystal X-ray diffraction. In all of these compounds, the divalent metal is coordinated by the ligand donor atoms in a square-planar arrangement. In addition, a serendipitously discovered new type of neutral Ni(II) complex, where the propane spacer of ligand L2 underwent oxid

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El-Ghamry, Hoda A., Rajaa O. Al-Ziyadi, Fatmah M. Alkhatib, Khadiga M. Takroni, and Abdalla M. Khedr. "Metal Chelates of Sulfafurazole Azo Dye Derivative: Synthesis, Structure Affirmation, Antimicrobial, Antitumor, DNA Binding, and Molecular Docking Simulation." Bioinorganic Chemistry and Applications 2023 (April 22, 2023): 1–20. http://dx.doi.org/10.1155/2023/2239976.

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A series of divalent and one trivalent metal chelates of the azo ligand resulting from coupling of sulfafurazole diazonium chloride with resorcinol have been designed and synthesized. Structure investigation of the isolated chelates have been achieved by applying spectroscopic and analytical tools which collaborated to assure the formation of the metal chelates in the molar ratios of 1L: 1M for Ni(II), Co(II), and Fe(III) chelates, where Cu(II) and Zn(II) complexes formed in the ratio 2L : 1M. The geometrical arrangement around the metal canters was concluded from UV-Vis spectra to be octahedr

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Malik, Radhika, and Ronald E. Viola. "Structural characterization of tartrate dehydrogenase: a versatile enzyme catalyzing multiple reactions." Acta Crystallographica Section D Biological Crystallography 66, no. 6 (2010): 673–84. http://dx.doi.org/10.1107/s0907444910008851.

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The first structure of an NAD-dependent tartrate dehydrogenase (TDH) has been solved to 2 Å resolution by single anomalous diffraction (SAD) phasing as a complex with the intermediate analog oxalate, Mg2+and NADH. This TDH structure fromPseudomonas putidahas a similar overall fold and domain organization to other structurally characterized members of the hydroxy-acid dehydrogenase family. However, there are considerable differences between TDH and these functionally related enzymes in the regions connecting the core secondary structure and in the relative positioning of important loops and hel

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Abu-Youssef, Morsy A. M., Vratislav Langer, Assem Barakat, Matti Haukka, and Saied M. Soliman. "Molecular, Supramolecular Structures Combined with Hirshfeld and DFT Studies of Centrosymmetric M(II)-azido {M=Ni(II), Fe(II) or Zn(II)} Complexes of 4-Benzoylpyridine." Symmetry 13, no. 11 (2021): 2026. http://dx.doi.org/10.3390/sym13112026.

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The supramolecular structures of the three metal (II) azido complexes [Fe(4bzpy)4(N3)2]; 1, [Ni(4bzpy)4(N3)2]; 2 and [Zn(4bzpy)2(N3)2]n; 3 with 4-benzoylpyridine (4bzpy) were presented. All complexes contain hexa-coordinated divalent metal ions with a slightly distorted octahedral MN6 coordination sphere. Complexes 1 and 2 are monomeric with terminal azido groups while 3 is one-dimensional coordination polymer containing azido groups with μ(1,1) and μ(1,3) bridging modes of bonding. Hirshfeld analysis was used to quantitatively determine the different contacts affecting the molecular packing i

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Naeimi, Khadijeh, Mehdi Bayat, and Ehsan Alavi Pour. "Trinuclear cylinder-like potential anticancer and antibacterial Cu(i), Ag(i) and Au(i) nano-sized cationic complexes with tris-NHC ligands: cationic M₃ metal cluster displaying positive or negative cooperativity in triad [L₂(R)₆→M₃]³⁺ complexes?" RSC Advances 15, no. 9 (2025): 6742–52. https://doi.org/10.1039/d4ra08514k.

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N-Heterocyclic carbenes (NHCs) are a class of organic molecules containing a divalent carbon atom, known as a carbene, within a heterocyclic (ring) structure where nitrogen atoms (N) form part of the ring.

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Ahmed Hassan Abdel Salam, Ahmed Hassan Abdel Salam. "Synthesis, Structural Chemistry, and Biological Studies on Various Divalent Copper Chelates of Novel Ligands Derived from Food Preservative, Dehydroacetic Acid, with Anilines." Journal of the chemical society of pakistan 41, no. 6 (2019): 1055. http://dx.doi.org/10.52568/000823/jcsp/41.06.2019.

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Various six coordinated copper(II) complexes of novel (E)-4-hydroxy-6-methyl-3-(1-(p-tolylimino) ethyl-2H-pyran-2-one (HL1) and (E)-3-(1-(4-chlorophenylimino) ethyl-4-hydroxy-6-methyl-2H-pyran-2-one (HL2) derived from 3-Acetyl-2-hydroxy-6-methyl-4H-pyran-4-one (dehydroacetic acid, DHA) and aniline derivatives (p-chloroaniline and p-toluidine) were fabricated. The coordination mode of Schiff base donor atoms with copper ions was well investigated by thermal and elemental analyses, FTIR, UV-vis, 1H, 13C-NMR spectral tools and measurements of magnetic susceptibility as well as molar conductance a

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Al-Shemary, Rehab K., Inam H. Ibrahim, and Nibras A. Al-marsomy. "Synthesis, Characterization and Biological Activity of Some Mixed Ligand Complexes of 1, 10-Phenanthronline and [4-(2-hydroxy-1,2-diphenylethylideneamino)-N-pyrimidin-2-yl) benzene sulfonamide] with Divalent Metal Ions." Al-Mustansiriyah Journal of Science 27, no. 5 (2017): 55. http://dx.doi.org/10.23851/mjs.v27i5.168.

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Schiff base ligand [4-(2-hydroxy-1, 2-diphenylethylideneamino)-N-pyrimidin-2-yl)benzene sulfonamide] (L) was prepared through a condensation reaction of sulfadiazine and benzoin in acidic medium. The prepared ligand has been characterized with different techniques (C.H.N.S, FT-IR, UV-Vis and 1H&13C-N.M.R). Mixed ligand complexes of some divalent metal ions [Co(II), Mn(II), Ni(II),Cu(II) and Hg(II)] were prepared by the reaction of [4-(2-hydroxy-1,2-diphenylethylidene amino)-N-pyrimidin-2-yl)benzene sulfonamide](L) and 1,10-Phenanthronline with the metal ions in basic conditions. The prepar

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Yang, Jin, Jian-Fang Ma, Dong-Mei Wu, Li-Ping Guo, and Jing-Fu Liu. "Syntheses, crystal structures and characterization of divalent transition metal sulfonate complexes with o-phenanthroline." Journal of Molecular Structure 657, no. 1-3 (2003): 333–41. http://dx.doi.org/10.1016/s0022-2860(03)00428-9.

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