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'Phosphine gold Carbodiimides' in keywords Facet   Publication Year 1996  [X]
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1Author    W. Schneider, K. Angermaier, H. SchmidbaurRequires cookie*
 Title    Polynuclear Gold Complexes of the Carbodiimide Unit [N=C=N]2  
 Abstract    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 configu­ ration. 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 11P signals (1:2:3 intensity) indicates an aggregation into higher nuclearity species with non-equivalent [Au(PPh3)] units. 
  Reference    Z. Naturforsch. 51b, 801—805 (1996); received December 4 1995 
  Published    1996 
  Keywords    Carbodiimide, Gold Complexes, (Phosphine)gold Carbodiimides 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0801.pdf 
 Identifier    ZNB-1996-51b-0801 
 Volume    51