First structural characterisation of a 2,1,12-MC2B9 metallacarborane, [2,2,2-(NMe2)3-closo-2,1,12-TaC2B 9H11]. Trends in boron NMR shifts on replacing a {BH} vertex with a metal {MLn} vertex in icosahedral carboranes

Andrci S. Batsanov, Pauline A. Eva, Mark A. Fox, Judith A.K. Howard, Andrew K. Hughes, Andrew L. Johnson, Aileen M. Martin, Ken Wade

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Reactions of M(NMe2)5 (M = Ta or Nb) with nido-2,9-C2B9H13 and the salt [Me3NH][;Y/o-7,9-C2B9H12] gave the isomeric dicarbollide complexes [2,2,2-(NMe2)3-c/ajo-2,1,12-MC2B9H11] (M = Ta 1, Nb 4) and [2,2,2-(NMe2)3-closo-2,1,7-MC2B9H11] (M = Ta 2, Nb 5) respectively. The structures of l and 2 were determined by single crystal X-ray diffraction and 1 represents the first structurally characterised example of a 2,1,12-MC2B9 metallacarborane. Comparison of 11B NMR data of the tantalum complexes, along with the isomeric [3,3,3-(NMe2)3-c/o5o-3,1,2TaC2B9H11] 3, with that of 1,2-, 1,7- and 1,12-C2B10H12, reveals that the metal vertex {Ta(NMe2)3}, on replacing a {BH} vertex, influences significantly the boron NMR shifts of the neighbouring and antipodal cage atoms. Based on this observation the assignments of the reported peaks in the boron NMR data for the seven isomers of (n5-CjH5)CoC2B9Hn are tentatively predicted.

Original languageEnglish
Pages (from-to)3519-3525
Number of pages7
JournalJournal of the Chemical Society, Dalton Transactions
Issue number20
DOIs
Publication statusPublished - 1 Dec 2000

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'First structural characterisation of a 2,1,12-MC<sub>2</sub>B<sub>9</sub> metallacarborane, [2,2,2-(NMe<sub>2</sub>)<sub>3</sub>-closo-2,1,12-TaC<sub>2</sub>B <sub>9</sub>H<sub>11</sub>]. Trends in boron NMR shifts on replacing a {BH} vertex with a metal {ML<sub>n</sub>} vertex in icosahedral carboranes'. Together they form a unique fingerprint.

Cite this