SYNTHESIS AND STUDY OF PROPERTIES OF ZINC COMPLEX WITH 3-(2-PYRIDYL)-5-(3,4,5-TRIMETOXYPHENYL)-1,2,4-TRIAZOLE

Abstract

A procedure has been developed for the synthesis of a zinc complex with chelating li-gand 3-(2-pyridyl)-5-(3,4,5-trimethoxyphenyl)-1,2,4-triazole. Within the framework of the density functional method, with the B3LYP functional in the SBKJC basis, the equilibrium geometry of the ground electronic state of the ligand molecule and zinc complex was determined. The physicochemical properties of the ligand were also characterized: logP = 4.1±0.1, рКf1 = 3.31±0.05, рКf2 = 10.2±0.1, ε275 ≈ 1·105 l·mol–1·cm–1. It was shown that complexation is accompanied by an increase in fluorescence intensity, for the complex λemmax ≈ 458 nm. The absorption spectrum of the complex is characterized by two bands with maxima at 278 nm (ε278 ≈ 1.3·104 l·mol–1·cm–1) and 322 nm (ε322 ≈ 1.2·104 l·mol–1·cm–1).