Metallaborane chemistry. Part 10. Insertion of zerovalent platinum species into bridging boron-hydrogen-boron bonds of 2,3-dicarba-nido-hexaborane(8), 2,3-dimethyl-2,3-dicarba-nido-hexaborane(8), and monocarba-nido-hexaborane(9); Molecular and crystal structure of [nido-μ4,5-{trans-(Et3P)2Pt(H)}-μ 5,6-H-2,3-C2B4H6]

Geoffrey K. Barker, Michael Green, F. Gordon A. Stone, Alan J. Welch, Thomas P. Onak, Gowit Siwapanyoyos

Research output: Contribution to journalArticle

Abstract

Reaction of [Pt2(μ-cod)(PEt3)4] (cod = cyclo-octa-1,5-diene) with 2,3-dicarba-nido-hexaborane(8), 2,3-dimethyl-2,3-dicarba-nido-hexaborane(8), and monocarba-nido-hexaborane(9) affords respectively, [nido-μ4,5-{trans(Et3P)2Pt(H)}-μ 5,6-H-2,3-CB5H6], [nido-μ4,5-{trans-(Et3P)2Pt(H)}-μ 5,6-H-2,3-Me2-2,3-C2B4H 4], and [nido-μ4,5-{trans-(Et3P)2Pt(H)}-(μ 3,4-H) (μ5,6-H)-2-CB5H6]. The molecular structure of [nido-μ4,5-{trans-(Et3P)2Pt(H)}-μ 5,6-H-2,3-C2B4H6] has been established by a single-crystal X-ray diffraction study. Four molecules crystallise in the monoclinic space group P21/m with cell dimensions a = 10.970(4), b = 11.587(3), c = 9.459(3) Å, and β = 114.47(2)°. The molecular structure has been elucidated by the analysis of 5 106 diffractometer-measured reflection intensities, and refined by least squares to R 0.043. The cage core atoms of the molecule maintain a nido pentagonal-pyramidal geometry, with adjacent facial carbon atoms. Both pentagonal B-B links are bridged, one by hydrogen and the other by a trans-(Et3P)2Pt(H) fragment, the latter demonstrating insertion by the metal nucleophile into a bridging B2H function of the nido-carbaboranes. All cage hydrogen atoms have been located and positionally refined. The 1H, 11B, and 31P n.m.r. spectra of the new compounds have been recorded, and the results are discussed in terms of the molecular structures of the carbaplatinaboranes.

Original languageEnglish
Pages (from-to)1687-1692
Number of pages6
JournalJournal of the Chemical Society, Dalton Transactions
Issue number11
DOIs
Publication statusPublished - 1979

ASJC Scopus subject areas

  • Chemistry(all)

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