title: Synthesis and characterization of phenanthrylphosphine gold complex: observation of Au-induced blue-green phosphorescence at room temperature.
abstract: A new 9-diphenylphosphinophenanthrene ligand (9DPP, 1), its oxide (9DPPO, 2), and its gold complex [(AuCl(9DPP)] (3) were synthesized. The Au(I) complex 3 was found to exhibit intense blue-green, room-temperature phosphorescence (Phip = 0.06 and tauT = 22.7 micros) originating in the locally excited triplet of the phenanthrene moiety (3LE) in degassed 2-methyltetrahydrofuran solution. On the assumption that PhiST = 1.0 for 3, the radiative rate constant (kr) in the triplet state is calculated to be 2.6 x 10(3) s(-1). This value is 4 orders of magnitude larger than the radiative rate constant of the triplet phenanthrene (0.26 s(-1)). Thus, the coordinated Au(I) atom is concluded to have a markedly large heavy-atom effect on kr of the phenanthrene chromophore in 3.
authors.affiliation: RIKEN (The Institute of Physical and Chemical Research), Wako-shi, Saitama 351-0198, Japan. osawa@postmsn.riken.jp
authors.forename: Masahisa
authors.initials: M
authors.lastname: Osawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Hoshino
authors.forename: Munetaka
authors.initials: M
authors.lastname: Akita
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Wada