Syntheses, Characterizations, Luminescence Properties, and Electronic Structures of Gold(I) Bis(phosphine)-Xanthate Complexes

Abstract

Syntheses, structures and photophysical properties of some bis(phosphine) xanthate complexes, L 2 AuS 2 COR, L=Ph 3 P, CEP(tris(cyanoethyl)phosphine) are described. Extended Huckel and Fenske-Hall molecular orbital (MO) calculations indicate that finding activates the gold(I) center for interaction with nucleopHiles. Experimentally, it is observed that the compound with the smaller P-Au-P angle (Ph 3 P) also shows the shortest Au-S distance. In fact, the (CEP) 2 AuS 2 COEt complex has two nearly identical Au-S distances at 2.745(2) and 2.934(2) A, which are 0.2 A longer than the short Au-S distance, 2.530(2) A, in the (Ph 3 P) 2 AuS 2 COEt complex