Restricted Rotation around the P−C Bond in Metalated Phosphonium Salts: A Variable-Temperature 1H NMR Study. X-ray Crystal Structures of [AuP(C6H11)32μ-C(PTo3)(py-2)]ClO4 and [(AuPPh3)2μ-C(PPh3)(py-2)(AuPPh3)](CF3SO3)2 | Publicación