Abstract
Treatment of tert-butylamine and benzylamine with [Au(PR′3)]BF4 led to the monoauration products [(R′3P) AuNH2R]+BF4–(R′= Me, R = But1a; R′= Me, R = CH2Ph 1b; R′3= Ph2Me, R = But1c). The salts [{Au(PMe3)}3NR]+BF4–(R′= Me, R = But2a or CH2Ph 2b) derived from the same amines were obtained using the corresponding oxonium salt [{Au(PMe3)}3O]+BF4–. A diauration product [{Au(PMe3)}2NH(CH2Ph)]+BF4–3 was generated upon slow hydrolytic degradation of 2b in solution. Treatment of NH(SiMe3)2 with [{Au(PMe3)}3O]+BF4– afforded both the tris- and tetra-aurated ammonium salts, [{Au(PMe3)}3NSiMe3]+BF4–2c and [{Au(PMe3)}4N]+BF4–4, depending on the reaction conditions. The cation of 2c is one of the very rare examples of silylammonium species. Compound 4 was also obtained from the oxonium salt and ammonia. All compounds have been characterized through analytical and spectroscopic data. The crystal structure of 1a, 1c and 3 have been determined by X-Ray diffraction methods: 1c is a salt with monomeric gold ammonium cations, but 1a and 3 show supramolecular aggregation of the cations into dimers with short intercationic Au ⋯ Au contacts.
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More From: Journal of the Chemical Society, Dalton Transactions
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