Chemistry of molecular and supramolecular structures of vanadium(IV) and dioxygen-bridged V(V) complexes incorporating tridentate hydrazone ligands |
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Authors: | Neema Ani Mangalam SR Sheeja Edward RT Tiekink |
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Institution: | a Department of Applied Chemistry, Cochin University of Science and Technology, Kochi, Kerala 682 022, India b Department of Chemistry, University of Texas, San Antonio, TX 78249, USA |
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Abstract: | Four hydrazone ligands: 2-benzoylpyridine benzoyl hydrazone (HBPB), di-2-pyridyl ketone nicotinoyl hydrazone (HDKN), quinoline-2-carbaldehyde benzoyl hydrazone (HQCB), and quinoline-2-carbaldehyde nicotinoyl hydrazone (HQCN) and four of their complexes with vanadyl salts have been synthesized and characterized. Single crystals of HBPB and complexes VO(BPB)(μ2-O)]2 (1) and VO(DKN)(μ2-O)]2·½H2O (2) were isolated and characterized by X-ray crystallography. Each of the complexes exhibits a binuclear structure where two vanadium(V) atoms are bridged by two oxygen atoms to form distorted octahedral structures within cis-N2O4 donor sets. In most complexes, the uninegative anions function as tridentate ligands, coordinating through the pyridyl- and azomethine-nitrogen atoms and enolic oxygen whereas in complex VO(HQCN)(SO4)]SO4·4H2O (4) the ligand is coordinated in the keto form. Complexes VO(QCB)(OMe)]·1.5H2O (3) and 4 are found to be EPR active and showed well-resolved axial anisotropy with two sets of eight line pattern. |
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Keywords: | Crystal structure Hydrazones Vanadium(IV/V) complexes EPR spectra Binuclear complexes Supramolecular structures |
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