Abstract
Abstract The ligand scrambling reaction of R3PAuC15N to form (R3P)2Au+ and Au(C15N)2 − has been studied (by 15N and 31P NMR spectroscopy) for R = Me, Et, i-Pr, and Ph. 31P NMR showed two resonances due to R3PAuCN and (R3P)2Au+ species, while 15N NMR showed only an averaged resonance due to R3PAuC15N and Au(C15N)2 − species, except for Et3PAuC15N, for which two separate resonances were detected. R3PAu13C15N (where R = Me, Et and Ph) complexes were also prepared and 2J(31P-13C) as well as 3J(31P-15N) constants were measured. The free activation energy for ligand scrambling in Ph3PAuCN was determined by 31P NMR band shape analysis to be 39.7 kJ/mol−1.
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