Physico-chemical, Antioxidant and Antimicrobial Investigation on New Mixed Ligand Complexes Containing bis(2,4,4-trimethylpentyl)dithiophosphinic acid and 2,2′-bipyridine

Abstract

New six mixed ligand complexes have been synthesized from bis(2,4,4-trimethylpentyl)dithiophosphinic acid (C16H35PS2) and 2,2′-bipyridine (C10H8N2) with various metal(II) ions. The molecular formula of the mixed ligand complexes were [Mn(C16H34PS2)(C10H8N2)]Cl (1), [Fe(C16H34PS2)(C10H8N2)]Cl (2), [Co(C16H34PS2)(C10H8N2)]Cl (3, [Cu(C16H34PS2)(C10H8N2)]Cl (4), [Zn(C16H34PS2)(C10H8N2)]Cl (5) and [Cd(C16H34PS2)(C10H8N2)]Cl (6). These mixed ligand complexes have been characterized by various physico-chemical techniques such as melting point, molar conductance, magnetic susceptibility measurements as well as UV-VIS, FT-IR, TG and mass spectroscopic analyses. The surface morphology of ligand (2,2′-bipyridine) and synthesized mixed ligand complexes were determined by scanning electron microscope (SEM). The magnetic moment value, color as well as spectral measurements have been suggested that the geometry of the mixed ligand complexes was tetrahedral. The spectral data has been showed that bis(2,4,4-trimethylpentyl)dithiophosphinic acid and 2,2′-bipyridine ligands were acted as uninegative and neutral bidentate ligand, respectively. The complex 5 was found to have better scavenging activity against 2,2-diphenyl-1-picrylhydrazyl. The complex 3 was showed very good antibacterial activity against Clostridium botulinum as compared to standard drug, imipenem. Moreover, the complex 5 also displayed good antifungal activity against Aspergillus niger.