Electrochemical studies: Biological evaluation of the homometallic‐binuclear complexes of malonate‐derived tetradentate O₂N₂ ligand

Abstract

Novel metal complexes were synthesized by mixing N1,N3‐bis(4‐phenylthiazol‐2‐yl)malonamide with Cr (III), Fe (III), Cu (II), and Zn (II) nitrates in a 1:2 (L: metal) ratio. Through the use of several analytical and spectral methods, the structures of all compounds were determined. It was determined that the novel ligand functions through O2N2 sites as a neutral tetradentate. The thermal stability and the thermodynamic parameters were evaluated using thermal gravimetric analysis and the Coats‐Redfern equations. Powder X‐ray diffraction investigation revealed the type of unit cell and the degree of crystallinity. The complexes were further tested for their antibacterial efficacy, with molecular simulation using several proteins demonstrating the strongest action against a range of pathogens. Optimization for all compounds were made through the basis set DFT/B3LYP/LANL2DZ to find the theoretical stability, FMO orbitals, energy gaps, molecular electrostatic potentials (MEPs), and evaluate physical parameter. Here, the electrochemical properties of the metal complexes were investigated using cyclic voltammetry and electrochemical impedance spectroscopy methods. Additionally, [Cr2(L)(NO3)4(H2O)4](NO3)2 complex has been authorized that has high electrocatalytic characteristics, making it attractive for use in supercapacitor applications.