Pentahapto-bonded gold heteroborane clusters [3-(R3P)-closo-2,1-AuTeB10H10](-) and [3-(R3P)-closo-3,1,2-AuAs2B9H9](-)

G Ferguson, J F Gallagher, J D Kennedy, A M Kelleher, T R Spalding

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20 Citations (Scopus)

Abstract

Gold acetylide compounds [(R3P) AuC equivalent to CC(Me)(OH)Et], where R = Ph 1 or cyclohexyl (Cy) 2, were synthesised and 2 was characterised using X-ray diffraction techniques. The solid-state structure of 2 contained a two-coordinate gold atom and a linear P-Au-C equivalent to C-C bonding sequence. The reactions between 1 or 2 and [NR4][nido-7,8-As2B9H10] or [NR4][nido-7-TeB10H10] in ethanol-acetone solvent afforded the twelve-vertex cluster species [NMe4][3-(R3P)-closo-3,1,2-AuAs2B9H9], where R = Ph 5 or Cy 6, or [NEt4][3-(R3P)-closo-2,1-AuTeB10H10], where R = Ph 7 or Cy 8, in moderate or low yields (ca. 35% for 5, 6 and 8 and ca. 20% for 7). Compounds 5 and 7 were characterised with X-ray crystallographic techniques. Although there was crystallographic disorder in the {As2B3} and {TeB4} rings to which the gold atoms were attached, the structures of 5 and 7 strongly suggested that the gold atoms were pentahapto bonded to all the atoms in the {As2B3} or {TeB4} rings giving formally closo cluster geometries with closo cluster electron counts. The solution-phase NMR properties of 5, 6 and 7 were consistent with closo descriptions.

Original languageEnglish
Pages (from-to)2133-2139
Number of pages7
JournalDalton Transactions
Issue number17
DOIs
Publication statusPublished - 2006

Keywords

  • MOLECULAR-STRUCTURE
  • CRYSTAL-STRUCTURES
  • METALLAHETEROBORANE CHEMISTRY
  • PHOSPHINE COMPLEXES
  • GROUP-1B METALS
  • DERIVATIVES
  • RESONANCE
  • BORANES
  • NMR
  • SPECTROSCOPY

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