A new six coordinated oxidovanadium(IV) Schiff base complex: Synthesis, characterization, crystal structure, thermal study and antibacterial activity

Abstract

A new oxidovanadium(IV) Schiff base complex of LVO(acac), {L = BrC6H3(O)HCN CH2CH2N(CH3)2] and acac = acetylacetonate}, was synthesized and characterized by elemental analysis(CHN), UV–vis and FT-IR spectra. The crystal structure of LVO(acac) was determined by single crystal X-ray diffraction. It is seen that V(IV) is in a distorted octahedral coordination sphere. The HL Schiff base ligand acts as tridentate and coordinated to V(IV) via one imine nitrogen, one amine nitrogen and one phenolato oxygen atoms in equatorial plane. The ligand acac acts as bidentate and is coordinated to V(IV) from two oxygen atoms, one oxygen is in equatorial plane and the other is in axial position. The coordination of V(IV) is completed by oxo atom in axial position. The thermogravimeric analysis of the LVO(acac) showed that it was decomposed in four stages. The LVO(acac) was also thermally decomposed in air at 690 °C and the XRD pattern of the obtained solid showed the formation of the V2O5 nanoparticles with the average size of 34 nm. The antibacterial activity of ligand and complex were tested against gram-positive and gram-negative bacteria. The HL ligand showed higher antibacterial activity than LVO(acac) complex.