Azo-and quinone-conjugated redox complexes-photo-and proton-coupled intramolecular reactions based on d-π interaction

摘要

Novel photo-and proton-coupled behavior of azo-and quinone-conjugated metal complexes based on the d-π electronic interaction is described. The quantum yield for photoisomerization of azobenzene-bridged bis(terpyridine) complexes significantly depends on the nature of the metal, counterions, and solvents. The trans-to-cis isomerization of azoferrocene proceeds not only by the photoexcitation of the π-π~* transition band but also by the photoexcitation of the MLCT(d-π~* transition) band. The oxidation of the ferrocene moieties occurs at 0.3 V less positive potential, and the electronic interaction between the ferrocene moieties is significantly weaker in cis-azoferrocene than in trans-azoferrocene.