title: Luminescent Rhenium(I) Pyridyldiaminocarbene Complexes: Photophysics, Anion-Binding, and CO2-Capturing Properties.
abstract: A series of luminescent isocyanorhenium(I) complexes with chelating acyclic diaminocarbene ligands (N^C) has been synthesized and characterized. Two of these carbene complexes have also been structurally characterized by X-ray crystallography. These complexes show blue-to-red phosphorescence, with the emission maxima not only considerably varied with a change in the number of ancillary isocyanide ligands but also extremely sensitive to the electronic and steric nature of the substituents on the acyclic diaminocarbene ligand. A detailed study with the support of density functional theory calculations revealed that the lowest-energy absorption and phosphorescence of these complexes in a degassed CH2Cl2 solution are derived from the predominantly metal-to-ligand charge-transfer [dπ(Re) → π*(N^C)] excited state. The unprecedented anion-binding and CO2-capturing properties of the acyclic diaminocarbene have also been described.
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Chi-On
authors.initials: CO
authors.lastname: Ng
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Shun-Cheung
authors.initials: SC
authors.lastname: Cheng
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Wing-Kin
authors.initials: WK
authors.lastname: Chu
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Kin-Man
authors.initials: KM
authors.lastname: Tang
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Shek-Man
authors.initials: SM
authors.lastname: Yiu
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Chi-Chiu
authors.initials: CC
authors.lastname: Ko