Synthesis and/or molecular structures of some simple 2,1,7- and 2,1,12-ruthena- and cobaltacarboranes

M E Lopez, David Ellis, Paul R. Murray, Georgina M. Rosair, Alan J. Welch, Lesley J. Yellowlees

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The ruthenacarboranes 2-(p-cymene)-2,1,7-closo-RuC2B 9H11 (2) (p-cymene = 1-methyl-4-isopropylbenzene) and 2-(p-cymene)-2,1,12-closo-RuC2B9H11 (3) have been synthesised by simple metallation of [7,9-nido-C2B 9H11]2- and [2,9-nido-C2B 9H11]2-, respectively. In preparing the known cobaltacarborane 2-(?-C5H5)-2,1,12-closo-CoC 2B9H11 (6), the new bis(dicarbollide) [2,2'-Co(1,12-closo-C2B9H11)2] - (as its [(?-C5H5)2Co] + salt; 7) was also formed. Molecular structures of 2, 3, 6 and 7 and that of the known compound 2-(?-C5H5)-2,1,7-closo- CoC2B9H11 (5) have been determined. Patterns in <d(11B)>, the weighted average 11B NMR chemical shift, of these metallacarboranes, together with those in 3-(p-cymene)-3,1,2-closo-RuC2B9H11 (1) and 3-(?-C5H5)-3,1,2-closo-CoC2B 9H11 (4) are discussed in relation to <d(11B)> in the parent carboranes 1,2-closo-C2B10H12, 1,7-closo-C2B10H12 and 1,12-closo-C 2B10H12. The similarity between the 1H and 11B spectra of 6 and 7 confirm the isolobality of the [C5H 5]- and [C2B9H11] 2- ligands. An electrochemical study of 7 confirms that trends in the potential of the CoIII/CoII couple for the series of isomers of (?-C5H5)CoC2B9H 11 are reproduced for the bis(dicarbollides) [Co(C2B 9H11)2]-. The molecular structures of compounds 1-3 as a family and 4-6 as a family provide a unique opportunity to consider structural patterns in simple isomeric metallacarboranes. © 2010 Institute of Organic Chemistry and Biochemistry.

Original languageEnglish
Pages (from-to)853-869
Number of pages17
JournalCollection of Czechoslovak Chemical Communications
Volume75
Issue number8
DOIs
Publication statusPublished - Aug 2010

Keywords

  • Boron clusters
  • Carboranes
  • Cobalt
  • Crystallography
  • Electrochemistry
  • Metallacarboranes
  • Ruthenium
  • X-ray diffraction

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