Syntheses and luminescence studies of mixed-metal gold(I)-copper(I) and -silver(I) alkynyl complexes. the "turning-on" of emission upon d 10 metal ion encapsulation

Abstract

Reaction of the gold(I) alkynyl precursor complexes, [(R 3P)Au{CξCC(=CH2)Me}] (R = Ph 1,p-Tol 2) and [(μ-dppf)-Au2{CξCC(=CH2)Me}2] 3, with copper(I) or silver(I) ions led to the formation of a series of luminescent η2-alkynyl mixed-metal complexes, [{η2- (R 3P)Au{CξCC(=CH2)Me}}2Cu]PF6 (R = Ph 4, p-Tol 5) and [(μ-dppf)Au2{η2-CξCC-(= CH2)Me}2M]X (M = Cu, X = PF66; M = Ag, X = OTf 7). The X-ray crystal structures of 1 and 3 have been determined. The photophysical properties of the complexes have been investigated. Coordination of 1-3 as metalloligands to copper(I) and silver(I) ions to afford the respective complexes 4-7 has been demonstrated to be a versatile means to perturb the emission properties. The luminescence behaviour of 3 has been "turned on" upon copper(I) or silver(I) encapsulation in 6 and 7. © The Royal Society of Chemistry 2003.