Synthesis, spectral, molecular modeling, biological and antitumor studies of new nifuroxazide complexes

Abstract

Series of Zr(IV), Ce(IV) and U(VI) complexes were synthesized with nifuroxazide ligand. Design and formulae of the complexes suggested in the light of analytical, spectral, magnetic and thermal analyses (1HNMR, IR, UV-Vis). The calculated values of molar conductance mean that, all isolated complexes were electrolytes. The data revealed the complexes formation and suggested that nifuroxazide binds as a bidentate at NO sites with metal ions. The kinetic parameters evaluated using Coats Redfern (CR) and Horowitz-Metzeger (HM) methods. The thermodynamic data reflect the thermal stability for all complexes. The calculated bond length and force constant values for UO2 bond are 1.741 Å and 459.409 Nm−1. The research investigations were related to quantum chemical calculations conducted at the theory level of DFT/B3LYP/LANL2DZ. The nifuroxazide, inorganic salts and their metal complexes were assayed against different bacterial species as well as the in vitro growth inhibitory activity against human breast carcinoma (MCF-7) and HCT-116 cell lines. Zr(IV) complex was found to have the highest activity against all the tested organisms and a powerful anti-cancer drug.