Transition metal chelates of novel ligand bearing Isatin moiety: Synthesis, Structural characterization, Voltammetric analysis of heavy metals, Molecular docking and Biological evaluation

This study endorses the combination of experimental and pharmacological studies of 3d-metal chelates (Co(II), Ni(II), Cu(II) & Zn(II)) of novel ligand (E)-2-hydroxy-N'-(2-oxoindolin-3-ylidene)benzohydrazide (HBH) bearing isatin moiety. An array of physical and spectroscopic methods were employed to characterize the synthesized ligand and its 3d-metal complexes. In accordance with the spectroscopic methods, all the metal-coordinated compounds exhibited tridentate coordination and octahedral geometry. Further, a modified cobalt(II) metal complex carbon electrode with MWCNTs served as a sensor to identify three most noxious heavy metal ions (Pb2+, Hg2+, Cd2+) individually and simultaneously using CV and LSV methods. Generally, the proposed sensor was reliable, repeatable with high sensitivity ensuring its practical implementations in real samples with agreeable results. Also, an important aspect of this study was the exploration of the antimicrobial, antioxidant, antiobesity and anticancer properties of ligand HBH and its 3d-metal complexes. The results from the biological screening exposed the fact that the coordinated compounds demonstrated significantly higher pharmacological activities than their ligand. Additionally, molecular docking study was undertaken for antimicrobial and anticancer receptors to determine binding modes of ligand and its metal chelates.

Automated summary

This study investigates the combination of experimental and pharmacological studies on 3d-metal chelates of a novel ligand (HBH) bearing isatin moiety. The metal-coordinated compounds exhibited tridentate coordination and octahedral geometry. A modified cobalt(II) metal complex carbon electrode served as a reliable sensor for identifying heavy metal ions using CV and LSV methods. Additionally, the study explores the antimicrobial, antioxidant, antiobesity, and anticancer properties of the ligand and its 3d-metal complexes.