ChemInform Abstract: Synthesis, Spectroscopic, and Electrochemical Properties of Bis(2,2′-bipyridyl)(3,3′-dimethyl-5,5′-bis-1,2,4-triazole)ruthenium(II) Hexafluorophosphate.

ChemInform Abstract

The new title complex (I) is obtained by reaction of dichlorobis(bipyridine)ruthenium with the triazole ligand in ethanol under reflux (40% yield). The spectroscopic and electrochemical properties show the ligand to be coordinated in an asym. fashion. Deprotonation of the ligand in the complex results in lower oxidation potentials and in a red shift of the lowest energy dπ-π* absorption band. This is explained by a stronger σ-donor ability of the deprotonated ligand. Two distinct deprotonation steps are observed. The results suggest that the bis(triazole) ligand is a rather weak π-acceptor ligand for the title compound and that only the bipyridine ligands are directly involved in the photophysical processes.