title: A series of luminescent Cu(I) mixed-ligand complexes containing 2,9-dimethyl-1,10-phenanthroline and simple diphosphine ligands.
abstract: A series of Cu(I) mixed-ligand complexes containing dmp (2,9-dimethyl-1,10-phenanthroline) and one of simple diphosphine ligands (Ph2P(CH2)nPPh2) were prepared. Among the complexes, [Cu(dppp)(dmp)]PF6 (n=3) and [Cu2(dppb)2(dmp)2](PF6)2 (n=4) were characterized by X-ray structure analyses. The dppp complex has been characterized as a mononuclear complex, while [Cu2(dppb)2(dmp)2]2+ exists as a dinuclear complex in which two dppb ligands bridge between the two Cu(I) atoms. Although the distorted tetrahedral structures around the central metals of the two complexes are similar, the P-Cu-P angles are different between the two complexes. All of the series of complexes show photoluminescence in solution, and the intensity of the luminescence increases with n (n=2-4). The non-radiative rate constants of the complexes decrease markedly with n although radiative rate constants of the complexes are similar.
authors.affiliation: Department of Materials and Life Science, Seikei University, Kichijoji-Kitamachi, Musashino, Tokyo 1808633, Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Saito
authors.forename: Takashi
authors.initials: T
authors.lastname: Arai
authors.forename: Naoki
authors.initials: N
authors.lastname: Takahashi
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Tsukuda
authors.forename: Taro
authors.initials: T
authors.lastname: Tsubomura