title: A luminescent supermolecule with gold(I) quinoline-8-thiolate: crystal structure, spectroscopic and photophysical properties.
abstract: The trinuclear complex [(8-QNS)(2)Au(AuPPh(3))(2)].BF(4) (8-QNS = quinoline-8-thiolate), with intramolecular gold(I)...gold(I) distances of 3.0952(4) and 3.0526(3) A, is aggregated to form a novel hexanuclear supermolecule, ([(8-QNS)2(Au(AuPPh3)2])2.(BF4)2, via a close intermolecular gold(I)...gold(I) contact of 3.1135(3) A. The beautiful hexanuclear supermolecule has an inversion center, and the six metal centers can be viewed as roughly coplanar. Six gold(I) ions are embedded in an ellipse and surrounded by 4 quinoline and 12 phenyl rings. The title compound shows interesting spectroscopic and luminescence properties dependent on the solvent polarity; i.e., it emits at ca. 440 and 636 nm in CH(2)Cl(2) and only at ca. 450 nm in CH(3)CN. The long-lived emission at ca. 636 nm (16.2 micros) in CH(2)Cl(2) is quenched by polar solvents such as CH(3)CN and CH(3)OH with quenching constants as 1.00 x 10(5) and 3.03 x 10(4) s(-1) M(-1), respectively, which is suggested to be related to the presence or absence of gold(I)...gold(I) interactions due to scrambling of the [AuPPh(3)]+ units, isolobal to H+.
authors.affiliation: Department of Chemistry and Biochemistry, National Chung Cheng University, 160 San-Hsin, Min-Hsiung, Chia-Yi, Taiwan 621. chebct@ccu.edu.tw
authors.forename: Biing-Chiau
authors.initials: BC
authors.lastname: Tzeng
authors.forename: Hsien-Te
authors.initials: HT
authors.lastname: Yeh
authors.forename: Yung-Chi
authors.initials: YC
authors.lastname: Huang
authors.forename: Hsiu-Yi
authors.initials: HY
authors.lastname: Chao
authors.forename: Gene-Hsiang
authors.initials: GH
authors.lastname: Lee
authors.forename: Shie-Ming
authors.initials: SM
authors.lastname: Peng