Synthesis, characterization, and antioxidant activities of imine compounds

Abstract

Monomeric complexes of the ligand H 2 L, with the general formula [M (HL 2 ) 2 ] with (M (II) = Co, Ni, Cu), have been synthesized and characterized by proton nuclear magnetic resonance ( 1 H-NMR), Fourier-transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), elemental microanalysis, metal content, magnetic moment and molar conductance measurements, molar conductance, and chloride containing. On the basis of experimental evidences, tetrahedral geometry has been proposed for prepared Schiff bases complexes. The geometry of the ligand and its complexes were confirmed by their optimized structures obtained from the computational study. Antioxidant activities of these compounds were evaluated against 1.1-diphenyl-2picrylhydrazyl (DPPH) radical and were compared with standard natural antioxidant, ascorbic acid. The results reveal that these compounds exhibit excellent radical scavenging activities.

Phosphorus‐based Schiff bases and their complexes as nontoxic antioxidants: Structure–activity relationship and mechanism of action

“…Theoretical calculations The geometries of ligand and its complexes were completely enhanced at B3LYP level using the 6-30++G(d,p) basis set in Gaussian 03W program [11] . …”

“…[11] 3 | RESULTS AND DISCUSSION Five standard solutions of gallic acid with altered concentrations (0.2, 0.4, 0.6, 0.8, and 1 M) were prepared from a stock solution of gallic acid (10 mmol L -1 ) using ethanol as solvent.…”

“…Data show that the compound with lower half maximal inhibitory concentration value has better DPPH radical-scavenging activity. [11,13] The presence of phosphorusbased Schiff base and electron donor groups such as hydroxyl moiety also had an effect on the DPPH radicalscavenging activity, whereas ethylene spacer did not have any desired result on the antioxidant property.…”

“…Because of their highly efficient catalytic activity, Schiff bases have been extensively studied, [9][10][11][12][13][14][15] with catalytic degradation of Schiff base complexes gaining popularity in recent years. Because of their highly efficient catalytic activity, Schiff bases have been extensively studied, [9][10][11][12][13][14][15] with catalytic degradation of Schiff base complexes gaining popularity in recent years.…”

New “one‐pot” Pd(II) and Zn(II) complexes of Schiff bases, derivatives of 1‐amino‐1‐deoxy‐d‐sorbitol: Spectroscopic studies and biological and catalytic activities

“…Imines are formed as intermediate products in biologically important reactions . Complexes of Schiff bases play an important role in the detection of various ions, exhibit biological properties, and are widely used as catalysts . Recently, several studies focused on Schiff bases and their complexes, derivatives of natural products, for example, amino sugars, amino acids, and chitosan .…”