Structural, photophysical, and catalytic properties of Au(I) complexes with 4-substituted pyridines.
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.
Lin
J C Y
JC
Department of Chemistry, National Dong Hwa University, Hualien, Taiwan, 97401.
Tang
S S
SS
Vasam
C Sekhar
CS
You
W C
WC
Ho
T W
TW
Huang
C H
CH
Sun
B J
BJ
Huang
C Y
CY
Lee
C S
CS
Hwang
W S
WS
Chang
A H H
AH
Lin
Ivan J B
IJ