Preparation, spectral and thermal properties of Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) complexes with iodosubstituted 2,2′-dipyrrolylmethene

Abstract

Complexes [ML 2 ] of cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II) with asymmetrically substituted ( E )-3-ethyl-5-[(4-iodo-3,5-dimethyl-2 H -pyrrol-2-ylidene)methyl]-2,4-dimethyl-1 H -pyrrole (HL) have been prepared and characterized for the first time. The spectral properties, stability in solutions and in the solid phase at elevated temperature of the complexes have been studied. The effects of complexing metal ion and the reaction medium on the spectral luminescent properties (absorptivity, quantum yield, fluorescence lifetime, and the radiation constant) and on thermal destruction of the [ML 2 ] complexes have been discussed.