Polynuclear Gold Complexes of the Carbodiimide Unit [N=C=N]2-

W. Schneider, K. Angermaier, H. Schmidbaur

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The reaction of N,N′-bis(trimethylsilyl)carbodiimide with equimolar quantities of tris[(triphenylphosphine)gold]oxonium tetrafluoroborate in dichloromethane at -40°C gives high yields of a trinuclear complex {[(Ph3P)Au]2NCN[Au(PPh3)]}+ BF4-(1). According to variable temperature NMR data the cation is fluxional in solution with a rapid site exchange of the [(Ph3P)Au] units, but has an unsymmetrical (N,N,N′) low temperature ground state configuration. A single crystal X-ray diffraction study has shown that in the crystal lattice these cations are associated further into cyclic, hexanuclear dimers through two short head-to-tail Au-Au contacts (auriophilicity). Treatment of complex 1 with one equivalent of [(Ph3P)Au]+ BF4- in tetrahydrofuran affords a tetranuclear complex {[(Ph3P)Au]2NCN[Au(PPh3)]2} 2+ 2BF4- (2). The ambient temperature NMR spectra of 2 suggest a fluxional, pseudo-symmetrical structure, but at low temperature a set of three 31P signals (1:2:3 intensity) indicates an aggregation into higher nuclearity species with non-equivalent [Au(PPh3)] units.

Original languageEnglish
Pages (from-to)801-805
Number of pages5
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
Issue number6
StatePublished - Jun 1996
Externally publishedYes


  • (Phosphine)gold Carbodiimides
  • Carbodiimide
  • Gold Complexes


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