title: Near-Infrared Phosphorescent Iridium(III) Benzonorrole Complexes Possessing Pyridine-based Axial Ligands.
abstract: Novel near-infrared phosphorescent iridium(III) complexes based on benzo-annulated N-linked corrole analogue (termed as benzonorrole) were synthesized. The structures of the complexes revealed octahedral coordination geometries involving an organometallic iridium-carbon bond with two external axial ligands. Interestingly, the iridium(III) complex exhibits near-infrared phosphorescence at room temperature at wavelengths beyond 900 nm. The significant redshift of the emission, as compared to the corrole congener, is originated from the ligand-centered triplet character. The fine-tuning of the photophysical properties of the complexes was achieved by introducing electron-donating and electron-withdrawing substituents on the axial pyridine ligands.
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Yogesh Kumar
authors.initials: YK
authors.lastname: Maurya
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ishikawa
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Kawabe
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Ishida
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Motoki
authors.initials: M
authors.lastname: Toganoh
authors.affiliation: Integrated Center for Sciences, Ehime University , Matsuyama 790-8577, Japan.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Mori
authors.affiliation: Graduate School of Arts and Sciences, The University of Tokyo , Tokyo 153-8902, Japan.
authors.forename: Yuhsuke
authors.initials: Y
authors.lastname: Yasutake
authors.affiliation: Graduate School of Arts and Sciences, The University of Tokyo , Tokyo 153-8902, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Fukatsu
authors.affiliation: Department of Chemistry and Biochemistry, Graduate School of Engineering and Center for Molecular Systems, Kyushu University , Fukuoka 819-0395, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Furuta