Metallaborane Chemistry.  Part 13.  Direct Insertion of a Platinum Nucleophile into nido-5,6-C2B8H12:  Synthesis and Structural Elucidation of [9-H-9,9-(Et3P)2-m10,11-H-7,8,9-C2PtB8H10] and [9-H-9,10-(Et3P)2-7,8,9-C2PtB8H9]

Geoffrey K. Barker, Michael Green, F. Gordon A. Stone, Wayne C. Wolsey, Alan J. Welch

Research output: Contribution to journalArticle

Abstract

The reaction (room temperature, diethyl ether) of [Pt2(μ-cod)(PEt3)4] (cod = cyclo-octa-1,5-diene) with nido-5,6-C2B8H12 affords [9-H-9,9(Et3P)210,11-H-7,8,9-C 2PtB8H10] (1), structurally characterised by X-ray diffraction. Crystals are orthorhombic, space group P212121, with four molecules in a unit cell of dimensions a = 14.825(4), b = 10.1367(13), and c = 16.1193(15) Å. Using 3 303 amplitudes recorded at 293 K the structure has been refined to R = 0.0575 (R′ = 0.0611). The cage of (1) approximates to a nido-icosahedron with a [graphic omitted] open face. Presumably the B-B connectivity in this face is hydrogen-bridged, but the bridge atom was not located in the crystallographic study. Thermolysis of (1) (100 °C toluene) releases one mol equiv. of H2 affording [9-H-9,10-(Et3P)2-7,8,9-C2PtB8H 9] (2), in which μ-H is lost and phosphine transfer from Pt to an adjacent facial B has occurred. Crystals are monoclinic, space group P21/c with a = 9.7813(16), b = 12.312(3) c = 20.519(3) Å, β = 99.053(16)°, and Z = 4. The structure was refined to R′ = 0.0578 (R′ = 0.0552) for 3 194 data measured at 293 K. The polyhedron of (2), formally a PtII species, shows distortion towards a closed octadecahedral architecture. The mechanism of the transformation of (1) into (2) is discussed in relation to the influence of the stereochemical changes involved.

Original languageEnglish
Pages (from-to)2063-2069
Number of pages7
JournalJournal of the Chemical Society, Dalton Transactions
Issue number9
DOIs
Publication statusPublished - 1983

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'Metallaborane Chemistry.  Part 13.  Direct Insertion of a Platinum Nucleophile into <i>nido</i>-5,6-C<sub>2</sub>B<sub>8</sub>H<sub>12</sub>:  Synthesis and Structural Elucidation of [9-H-9,9-(Et<sub>3</sub>P)<sub>2</sub>-m<sub>10,11</sub>-H-7,8,9-C<sub>2</sub>PtB<sub>8</sub>H<sub>10</sub>] and [9-H-9,10-(Et<sub>3</sub>P)<sub>2</sub>-7,8,9-C<sub>2</sub>PtB<sub>8</sub>H<sub>9</sub>]'. Together they form a unique fingerprint.

  • Cite this