title: Luminescent cyanoruthenate(II)-diimine and cyanoruthenium(II)-diimine complexes.
abstract: To improve the emission and excited-state properties of luminescent cyanometalates, new classes of highly solvatochromic luminescent cyanoruthenium(II) and cyanoruthenate(II) complexes of the general formulae [Ru(PR3)2(CN)2(NN)] and K[Ru(PR3)(CN)3(NN)], respectively, were developed. These complexes could be readily synthesized through the ligand-substitution reaction of K2[Ru(CN)4(PR3)2] with a diimine ligand. The geometrical isomerism of these complexes was characterized by using various spectroscopic techniques. Their photophysical properties, solvatochromism, and electrochemistry have also been investigated. Our detailed study showed that many of these complexes exhibited extremely environmentally sensitive emissions and significantly improved emission quantum efficiencies and lifetimes compared with the well-studied tetracyanoruthenate systems.
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (P.R. China), Fax: (+852) 3442-0522.
authors.forename: Hua
authors.initials: H
authors.lastname: Feng
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.forename: Sze-Wing
authors.initials: SW
authors.lastname: Lai
authors.forename: Shek-Man
authors.initials: SM
authors.lastname: Yiu
authors.forename: Chi-Chiu
authors.initials: CC
authors.lastname: Ko
keywords: coordination chemistry; electrochemistry; luminescence; ruthenium; solvatochromism