Vanadium pincer complex: synthesis, characterization, catalysis and biological studies

Abstract

New vanadium coordinated pincer complex is synthesized and characterized. Coordinating organic ligand (L₁) is designed to afford ONO coordination mode. Metal complex (ML₁) prepared by reacting VO(acac)₂ with 2-hydroxy-3,5-ditertiarybutyl benzaldehyde and o-aminophenol in methanol (where acac stands for acetylacetonate). Ligand (L₁) coordinates the central vanadium metal atom via ONO fashion hence occupied three coordination sites. For charge compensation vanadium retains one of the acetyl aetonate ligand and finally sixth coordination satisfied by terminal oxo group consequently attains octahedral geometry. This pincer type coordinated ligand provides strong meridonial environment to the metal center and also support to stabilize the higher oxidation state of vanadium. The complex is characterized by available analytical techniques such as Molar Conductance, UV-visible, IR, Cyclic Voltametry (CV), and Thermogravimetric Analysis (TGA). Biological behavior has been investigated towards antibacterial activity. The complex also successfully utilized as catalyst for the simple organic transformation.