Synthesis, spectroscopic studies and crystal structures of two new vanadium complexes of 2-benzoylpyridine containing hydrazone ligands

The reaction of VO(acac)2 with 2-benzoylpyridine substituted aroylhydrazones is studied. Oxovanadium(IV) and (V) complexes are obtained, indicating the binding of ligands to the metal ion through the imine nitrogen, enolate oxygen and pyridyl nitrogen. The oxovanadium(IV) compound [VOL1(OCH3)] · 0.14H2O (1a) gets oxidized to dioxovanadium(V) species [VO2L1] (1b) upon crystal formation. The crystal structures of the ligand and the two vanadium complexes are reported. Single crystal X-ray diffraction studies of the compound [VO(HL2)(μ2-O)]2 (2) revealed a centrosymmetric dimer.

Graphical abstractA new aroylhydrazone ligand and two oxovanadium complexes are synthesized and characterized. The ligand exists in keto form in the solid state. The tridentate ligand effectively coordinates through two nitrogens and one oxygen, thus undergoing enolization. Crystal studies of VO2L1 and [VO(HL2)(μ2-O)]2 reveals a distorted square pyramid and dimeric structure with oxobridging resulting in a distorted octahedral structure, respectively.Figure optionsDownload full-size imageDownload as PowerPoint slide