Interaction of Copper(II) Complexes of Bidentate Benzaldehyde Nicotinic Acid Hydrazones with BSA: Spectrofluorimetric and Molecular Docking Approach

Abstract

Two copper(II) complexes of 4-chloro- and 4-dimethylaminobenzaldehyde nicotinic acid hydrazones were prepared and characterized by elemental analysis, mass spectrometry, infrared and electron spectroscopy and conductometry. These rare examples of bis(hydrazonato)copper(II) complexes are neutral complex species with copper(II) center coordinated with two monoanionic bidentate O,N-donor hydrazone ligands coordinated in enol-imine form. The interaction of hydrazone ligands and corresponding copper(II) complexes with CT DNA and BSA was investigated. Copper(II) complexes are slightly effective in binding the DNA than pristine hydrazones. The results indicate groove binding or moderate intercalation which are not significantly affected by the nature of substituent at hydrazone ligands. On contrary, affinities of two copper(II) complexes toward BSA significantly differs and depends on the nature of the substituent, however in absence of thermodynamic data difference in nature of binding forces cannot be excluded. The complex bearing electron- withdrawing 4-chloro substituent has larger affinity toward BSA compared to 4-dimethyamino analogue. These findings were theoretically supported by molecular docking study.

Co(II), Mn(II), and Fe(III) complexes of water‐soluble hydrazone bearing 2‐nicotinoylhydrazineylidene moiety: Preparation, characterization, cyclic voltammetry, computational and biological studies

“…Aside from that, there are two other strong bands that have been identified as belonging to the π→π* transition of both C=O and C=N of both pyridyl and azomethine groups at 34,014 cm −1 (294 nm) and 29,940 cm −1 (334 nm). These bands exhibit a chelation‐induced shift toward higher wavenumbers in the metal complexes 21,22 …”

Synthesis, characterization, DFT studies and evaluation of the potential anti-tumour activity of nicotinic hydrazide based Schiff base using in vitro and molecular docking techniques

“…There is a sharp peak at 1664 cm −1 which is due to the presence of C = 0 group of the ligand. C N hyd N stretching vibrations are shown by sharp peaks around 1530 cm −1 [ 32 ]. Vibrational frequencies between 1560 cm −1 and 1417 cm −1 exhibits the presence of ν (C N) and ν (C C) bonds of the two-pyridine ring and aromatic ring respectively [ 29 , 33 ].…”