Abstract
Two novel copper(II) Schiff base complexes were synthesized and characterized by various physico-chemical and spectroscopic methods, revealing a distorted square planar geometry around the copper atom. The analytical data confirmed the 1:1 metal to ligand stoichiometry of the complexes. B3LYP/(LANL2DZ/6-311G**) density functional theory (DFT) were used to investigate structural and electronic properties of the synthesized compounds in gas phase. The computational results support the conclusion obtained by the experimental studies. Thermodynamic study of complex formation in solution was carried out spectrophotometrically at 25 °C. These compounds were also subjected to study in vitro antibacterial screening against some bacteria. Also, click reaction was investigated for its catalytic properties. The synthesized Schiff base copper complexes catalyzed 1,3-dipolar Huisgen cycloaddition of different functionalized ?-azido alcohols and alkynes in the presence of ascorbic acid in a solution of THF/H2O (2:1, V/V) at room temperature.
Highlights
Schiff bases are an important class of compounds in inorganic chemistry
The elemental analysis, IR and UV-Vis data and the physical properties such as melting points, yields, magnetic susceptibility of the ligands and their complexes were presented in the experimental section and in Tables 1 and 2. These data showed that the complexes has stoichiometry of the type [ML] where M = Cu and L = Schiff base ligands
All bond distances are in good agreement with those reported in other similar tetradentate Schiff base complexes.[18,51]
Summary
Schiff bases are an important class of compounds in inorganic chemistry. Research on these compounds has expanded very rapidly over the time and covered several applicative domains. Schiff base copper complexes with various types of ligands have shown to possess effective catalytic ability.[13,14,15]
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