The synthesis and characterization of σ-bonded gold carbaborane compounds: closo-Carbaboranes as good σ-donor ligands

Bruce D. Reid; Alan J. Welch

doi:10.1016/0022-328X(92)83420-M

The synthesis and characterization of σ-bonded gold carbaborane compounds: closo-Carbaboranes as good σ-donor ligands

Bruce D. Reid^*, Alan J. Welch

^*Corresponding author for this work

University of Edinburgh

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

A series of σ-bonded phosphine and arsine gold carbaborane compounds, 1-R′-2-ER₃Au-1,2-closo-C₂B₁₀H₁₀ (R′ CH₂OCH₃ or Ph, ER₃ PPh₃, P(o-tol)₃, PCy₃, PEt₃ or AsPh₃) have been prepared by reaction between ER₃AuCl and Li[1-R′-1,2-closo-C₂B₁₀H₁₀] in Et₂O. Consideration of their ¹¹B NMR and (where appropriate) ³¹P NMR chemical shifts implies that the closo-carbaborane ligands function as efficient electron donating groups. Comparison of the AuC distance in 1-CH₂OCH₃-2-AsPh₃AU-1,2-closo-C₂B₁₀H₁₀ (1e) and AsPh₃AuCH₃ (3) suggests that the gold-carbon bond in the former is stronger, and this is supported by analysis of the results of molecular orbital calculations at the extended Hückel level on model compounds. closo-Carbaboranes bonded to metal atoms via a MC bond are thereby shown to be good σ-donor ligands.

Original language	English
Pages (from-to)	371-384
Number of pages	14
Journal	Journal of Organometallic Chemistry
Volume	438
Issue number	3
DOIs	https://doi.org/10.1016/0022-328X(92)83420-M
Publication status	Published - 20 Oct 1992

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-328X(92)83420-M

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title = "The synthesis and characterization of σ-bonded gold carbaborane compounds: closo-Carbaboranes as good σ-donor ligands",

abstract = "A series of σ-bonded phosphine and arsine gold carbaborane compounds, 1-R′-2-ER3Au-1,2-closo-C2B10H10 (R′ CH2OCH3 or Ph, ER3 PPh3, P(o-tol)3, PCy3, PEt3 or AsPh3) have been prepared by reaction between ER3AuCl and Li[1-R′-1,2-closo-C2B10H10] in Et2O. Consideration of their 11B NMR and (where appropriate) 31P NMR chemical shifts implies that the closo-carbaborane ligands function as efficient electron donating groups. Comparison of the AuC distance in 1-CH2OCH3-2-AsPh3AU-1,2-closo-C2B10H10 (1e) and AsPh3AuCH3 (3) suggests that the gold-carbon bond in the former is stronger, and this is supported by analysis of the results of molecular orbital calculations at the extended H{\"u}ckel level on model compounds. closo-Carbaboranes bonded to metal atoms via a MC bond are thereby shown to be good σ-donor ligands.",

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N2 - A series of σ-bonded phosphine and arsine gold carbaborane compounds, 1-R′-2-ER3Au-1,2-closo-C2B10H10 (R′ CH2OCH3 or Ph, ER3 PPh3, P(o-tol)3, PCy3, PEt3 or AsPh3) have been prepared by reaction between ER3AuCl and Li[1-R′-1,2-closo-C2B10H10] in Et2O. Consideration of their 11B NMR and (where appropriate) 31P NMR chemical shifts implies that the closo-carbaborane ligands function as efficient electron donating groups. Comparison of the AuC distance in 1-CH2OCH3-2-AsPh3AU-1,2-closo-C2B10H10 (1e) and AsPh3AuCH3 (3) suggests that the gold-carbon bond in the former is stronger, and this is supported by analysis of the results of molecular orbital calculations at the extended Hückel level on model compounds. closo-Carbaboranes bonded to metal atoms via a MC bond are thereby shown to be good σ-donor ligands.

AB - A series of σ-bonded phosphine and arsine gold carbaborane compounds, 1-R′-2-ER3Au-1,2-closo-C2B10H10 (R′ CH2OCH3 or Ph, ER3 PPh3, P(o-tol)3, PCy3, PEt3 or AsPh3) have been prepared by reaction between ER3AuCl and Li[1-R′-1,2-closo-C2B10H10] in Et2O. Consideration of their 11B NMR and (where appropriate) 31P NMR chemical shifts implies that the closo-carbaborane ligands function as efficient electron donating groups. Comparison of the AuC distance in 1-CH2OCH3-2-AsPh3AU-1,2-closo-C2B10H10 (1e) and AsPh3AuCH3 (3) suggests that the gold-carbon bond in the former is stronger, and this is supported by analysis of the results of molecular orbital calculations at the extended Hückel level on model compounds. closo-Carbaboranes bonded to metal atoms via a MC bond are thereby shown to be good σ-donor ligands.

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ER -

The synthesis and characterization of σ-bonded gold carbaborane compounds: closo-Carbaboranes as good σ-donor ligands

Abstract

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