Synthesis, Characterization, Crystal Structures and Antimicrobial Activity of Oxidovanadium(V) Complexes with Mixed Ligands

Two new oxidovanadium(V) complexes, [VOLL1] (I) and [VOLL2] (II), where L is the dianionic form of the hydrazone ligand 2-cyano-N'-(2-hydroxy-3-methoxybenzylidene)acetohydrazide (H2L), L-1 and L-2 are the deprotonated form of 2-hydroxybenzohydroxamate (HL1) and 3-hydroxy-2-methyl-4H-pyran-4-one (HL2), respectively, have been prepared and characterized by elemental analyses, IR, UV-Vis, H-1 NMR and single crystal X-ray crystallographic determination (CIF files CCDC nos. 1880992 (I) and 1880993 (II)). The V atoms in the complexes are in octahedral coordination with the hydrazone ligand coordinates to the metal atoms through the phenolate O, imino N and enolate O atoms, and with 2-hydroxybenzohydroxamate and 3-hydroxy-2-methyl-4H-pyran-4-one through the carbonyl and hydroxyl O atoms. The effect of the compounds on the antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans was studied.