Spectroscopic and electrochemical properties of mixed-ligand cyclopalladinized complexes of deprotonated forms of 2-(2-thienyl)pyridine and 2-phenylpyridine with 1,10-phenantroline and its 1,4-diazine derivatives

Abstract

A comparative study of [Pd(N⋀C)(N⋀N)]+ complexes {(N⋀C)− are deprotonated forms of 2-phenylpyridine and 2-(2-thienyl)pyridine and (N^N) is 1,10-phenantroline, dipyrido[f,h]quinoxaline, dipyrido[a,c]phenazine or 6,7-dicyanodibenzo[f,h]quinoxaline} was carried out by the methods of 1H NMR, electronic absorption and emission spectroscopy, and cyclic voltammetry. Optical and electrochemical properties of dipyrido-substituted 1,4-diazines are conditioned by the electron transfer involving π* orbitals localized on weakly interacting phenantroline (π*phen) and diazne (π*diaz) components.