title: Structural, photophysical, and catalytic properties of Au(I) complexes with 4-substituted pyridines.
abstract: Ionic gold(I) complexes with general formula of [Au(Py)2][AuCl2] and [Au(Py)2][PF6] (Py = 4-substituted pyridines) have been synthesized. Structures of five Au(I) complexes and a Ag(I) complex were determined by single crystal X-ray diffraction. Evidence for cationic aggregation of [Au(py)2][PF6] complexes in solution was obtained by conductivity measurements and by the isosbestic point observed from variable temperature UV-visible absorption spectra. All compounds were luminous in the solid state. Calculations employing density functional theory were performed to shed light on the nature of the electronic transitions. While the [Au(4-dmapy)2][AuCl2] (4-dmapy = 4-dimethylaminopyridine) and [Au(4-pic)2][AuCl2] (4-pic = 4-picoline) emissions were found to be mainly ligand in nature, their [PF6](-) counterparts involved a Au...Au-interaction imbedded in the highest occupied molecular orbital. [Au(4-dmapy)2][AuCl2] was found to be an efficient catalyst for Suzuki cross-coupling of aryl bromide and phenylboronic acid.
authors.affiliation: Department of Chemistry, National Dong Hwa University, Hualien, Taiwan, 97401.
authors.forename: J C Y
authors.initials: JC
authors.lastname: Lin
authors.forename: S S
authors.initials: SS
authors.lastname: Tang
authors.forename: C Sekhar
authors.initials: CS
authors.lastname: Vasam
authors.forename: W C
authors.initials: WC
authors.lastname: You
authors.forename: T W
authors.initials: TW
authors.lastname: Ho
authors.forename: C H
authors.initials: CH
authors.lastname: Huang
authors.forename: B J
authors.initials: BJ
authors.lastname: Sun
authors.forename: C Y
authors.initials: CY
authors.lastname: Huang
authors.forename: C S
authors.initials: CS
authors.lastname: Lee
authors.forename: W S
authors.initials: WS
authors.lastname: Hwang
authors.forename: A H H
authors.initials: AH
authors.lastname: Chang
authors.forename: Ivan J B
authors.initials: IJ
authors.lastname: Lin