Synthesis, characterization, DNA cleavage and in vitro antimicrobial studies of La(III), Th(IV) and VO(IV) complexes with Schiff bases of coumarin derivatives

A series of La(III), Th(IV) and VO(IV) complexes have been synthesized with Schiff bases derived from 8-formyl-7-hydroxy-4-methylcoumarin and o-phenylenediamine/ethylenediamine. The structure of the complexes has been proposed in the light of analytical, spectral (IR, UV–vis, ESR and FAB-mass), Magnetic and thermal studies. The complexes are soluble in DMF and DMSO. The measured molar conductance values indicate that, the complexes are non-electrolytes in nature. The redox behavior of the complexes was investigated by electrochemical method using cyclic voltammetry. The Schiff bases and their complexes have been screened for their antibacterial (Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Salmonella typhi) and antifungal activities (Aspergillus niger, Aspergillus flavus and cladosporium) by Minimum Inhibitory Concentration method. The DNA cleavage activity of La(III) and VO(IV) metal complexes is studied by agarose gel electrophoresis method.

Graphical abstractA series of La(III), Th(IV) and VO(IV) complexes with Schiff bases H2LI and H2LII have been synthesized, characterized and screened for their in vitro antimicrobial activity. The DNA cleavage activity of the La(III) and VO(IV) complexes has been studies. The VO(IV) complexes posses square pyramidal geometry and electrochemical properties indicate one electron transfer quasi-reversible redox process.Figure optionsDownload full-size imageDownload as PowerPoint slide