Synthesis, spectra, crystal structure, Hirshfeld surface analysis, DFT calculations and molecular docking evaluation on novel mononuclearZn(II), Mn(III) and Co(III) Schiff base complexes derived from 2- hydroxy-1-naphthaldehyde

Abstract

Abstract four novel complexes of bidentate Schiff base ligand derived from 2-hydroxy-1-(2-methoxyethylimino)-naphthalen (HL) were synthesized and characterized using elemental analysis, FTIR, and UV–Vis spectroscopies. X-ray single crystal structures of Zn(II), Mn(III) and Co(III) complexes (1–4) have also been determined, and it was indicated that these Zn(II) and Co(III) complexes (1, 4) are in an octahedral geometry. Whereas, it was found that the Zn complex (2) in quite a regular tetrahedral environment. Also, Mn center in complex (3), is ligated by two azomethine nitrogen atom, two ligand oxygen atoms and one Cl atom of metal salt forming five coordinated tetragonal pyramid geometry around of the Mn atoms. The cyclic voltammetry (CV) of the complexes specifies an irreversible redox behavior for all complexes (1–4). Next, the molecular electrostatic potential (MEP) was studied for all complexes to better understand and predict the reaction sites of electrophilic and nucleophilic attacks. Also, density functional theory (DFT) calculations were performed to determine the optimal geometrical configurations, and comparison between experimental and theoretical data, and non-covalent interactions were determined by Hirshfeld surface analysis (HSA) using CrystalExplorer program. Also, finding binding affinity of complexes with protein (PDB ID: 4LXD) was also done using molecular docking.