Closo and semipseudocloso forms of the same carbametallaborane: Synthesis and spectroscopic and crystallographic characterisation of 1-CCPh-2-Ph-3-(η-L)-3,1,2-RhC2B9H9 (L=C5H5 and C5Me5): Part 25. Steric effects in heteroboranes

Rhona M. Garrioch, Georgina M. Rosair, Alan J. Welch

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16 Citations (Scopus)

Abstract

The compounds of 1-CCPh-2-Ph-3-(?-L)-3,1,2-RhC2B9H9 (L=C5H5, 1, and C5Me5, 2) have been prepared. The weighted average 11B-NMR chemical shift (11B>) for 1 is +2.53 ppm, suggesting that the cage is distorted into a semipseudocloso structure. For 2 in CDCl3 11B> is -0.7 ppm, between that anticipated for semipseudocloso and closo forms. Compound 2 crystallises in two different forms. Orange 2a is semipseudocloso, with C(1)-C(2) 2.052(5) Å, whilst yellow 2b is essentially closo, with C(1)-C(2) 1.828(7) Å. Dissolution of both 2a and 2b in CDCl3 affords an identical solution. © 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalJournal of Organometallic Chemistry
Volume614-615
Publication statusPublished - 8 Dec 2000

Keywords

  • Carbametallaborane
  • Closo
  • Crystallographic characterisation
  • Pseudocloso
  • Semipseudocloso

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