Abstract
Reaction of the metalloligand [Pt 2(μ-S) 2(PPh 3) 4] with the N-heterocyclic carbene (NHC) complexes IPrAuCl, IMesAuCl and IMesAgCl in methanol gave the first examples of metal adducts of [Pt 2(μ-S) 2(PPh 3) 4] that contain NHC ligands, namely [Pt 2(μ-S) 2(PPh 3) 4AuL] + (L = IPr, IMes) and [Pt 2(μ-S) 2(PPh 3) 4Ag IMes] +. The complexes were isolated as hexafluorophosphate salts. Reaction of [Pt 2(μ-S) 2(PPh 3) 4] with excess IPrAuCl in refluxing methanol yielded only the mono-adduct, in contrast to the behaviour with the gold(I) phosphine complex Ph 3PAuCl, which undergoes double addition giving [Pt 2(μ-SAuPPh 3) 2(PPh 3) 4] 2+. The X-ray structure of [Pt 2(μ-S) 2(PPh 3) 4Au IPr]PF 6 was determined and reveals that the ‘free’ sulfide is substantially sterically protected by the IPr ligand, accounting for the low reactivity towards addition of a second Ag IPr + moiety.
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