Steric Effects in Heteroboranes.  Part 8.  Sterically-Induced Exo-Skeletal Isomerisation of Di-Copper Carbametallaboranes.  Syntheses and Molecular Structures of (Ph3PCu)2Ph2C2B9H9 and {(o-tol)3PCu}2Ph2C2B9H9

Kerry J. Adams, Jill Cowie, Steven G. D. Henderson, Gillian J. McCormick, Alan J. Welch

Research output: Contribution to journalArticle

Abstract

In (Ph3PCu)2Ph2C2B9H9 (Ia) and {(o-tol)3PCu}2Ph2C2B9H9 (Ic) one copper atom occupies a polyhedral vertex position but is slipped away from the cage carbon atoms (the latter the more so) to relieve phosphine ṫ Ccage-phenyl crowding. The second copper atom is exo-facially bonded to the B(8)B(9)B(12) triangular face, in contrast to the situation in (Ph3PCu)2C2B9H11, where the exo-metal caps the Cu(3)B(4)B(8) triangle. Compounds Ia, Ic and the related species (Cy3PCu)2Ph2C2B9H9 (Ib) display fluxionality in solution at room temperature that renders equivalent the two phosphorus nuclei. It is speculated that this fluxional process involves a unique bis(eto-metal) nido carbaborane.

Original languageEnglish
Pages (from-to)C9-C11
Number of pages3
JournalJournal of Organometallic Chemistry
Volume481
Issue number2
DOIs
Publication statusPublished - 15 Nov 1994

Keywords

  • Boron
  • Carborane
  • Copper
  • Fluxionality
  • Metalla-carborane
  • X-ray diffraction

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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