Title of article :
Chemistry of molecular and supramolecular structures of vanadium(IV) and dioxygen-bridged V(V) complexes incorporating tridentate hydrazone ligands
Author/Authors :
Neema Ani Mangalam، نويسنده , , Sarika Sivakumar، نويسنده , , S.R. Sheeja، نويسنده , , M.R. Prathapachandra Kurup، نويسنده , , Edward R.T. Tiekink، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
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.
Keywords :
Binuclear complexes , Supramolecular structures , EPR spectra , Vanadium(IV/V) complexes , hydrazones , crystal structure
Journal title :
INORGANICA CHIMICA ACTA
Journal title :
INORGANICA CHIMICA ACTA