Novel sandwich cations of platinum with tetramethyl-cyclobutadiene and cyclopentdienyl or hexamethylbenzene ligands

Gerhard E. Herberich; Ulli Englert; Frank Marken

doi:10.1039/DT9930001979

Novel sandwich cations of platinum with tetramethyl-cyclobutadiene and cyclopentdienyl or hexamethylbenzene ligands

Gerhard E. Herberich, Ulli Englert, Frank Marken

RWTH Aachen University

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

Abstract

Highly reactive cations [Pt(η⁴-C₄Me₄)(solv)_x] ²⁺ (solv = acetone or nitromethane) can be obtained from [{Pt(η⁴-C₄Me₄)Cl₂}] by chloride abstraction with AgCF₃SO₃. The solvento complex [Pt(η⁴-C₄Me₄)-(Me₂CO) _x][CF₃SO₃]₂ reacts with cyclopentadines and with hexamethylbenzene to form the sandwich compounds [Pt(η⁴-C₄Me₄)(dienyl)]CF₃SO ₃ (dienyl = η⁵C₅Me₅, η⁵-C₅H₄Me or η⁵-C₅H₅) and [Pt(η⁴-C₄Me₄)(η⁶-C ₆Me₆)][CF₃SO₃] ₂·Me₂CO. The new compounds are characterised by ¹H, ¹³C and ¹⁹⁵Pt NMR spectroscopy and cyclic voltammetry. The structure of the hexamathylbenzene complex, determined by X-ray crystallography, reveals an average Pt-C distance of 2.138 Å for the C₄Me₄ ligand and 2.351 Å for the C₆Me₆ ligand indicating a pronounced structural trans effect.

Original language	English
Pages (from-to)	1979-1982
Number of pages	4
Journal	Journal of the Chemical Society, Dalton Transactions
Issue number	13
DOIs	https://doi.org/10.1039/DT9930001979
Publication status	Published - 1 Dec 1993

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General Chemistry

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title = "Novel sandwich cations of platinum with tetramethyl-cyclobutadiene and cyclopentdienyl or hexamethylbenzene ligands",

abstract = "Highly reactive cations [Pt(η4-C4Me4)(solv)x] 2+ (solv = acetone or nitromethane) can be obtained from [{Pt(η4-C4Me4)Cl2}] by chloride abstraction with AgCF3SO3. The solvento complex [Pt(η4-C4Me4)-(Me2CO) x][CF3SO3]2 reacts with cyclopentadines and with hexamethylbenzene to form the sandwich compounds [Pt(η4-C4Me4)(dienyl)]CF3SO 3 (dienyl = η5C5Me5, η5-C5H4Me or η5-C5H5) and [Pt(η4-C4Me4)(η6-C 6Me6)][CF3SO3] 2·Me2CO. The new compounds are characterised by 1H, 13C and 195Pt NMR spectroscopy and cyclic voltammetry. The structure of the hexamathylbenzene complex, determined by X-ray crystallography, reveals an average Pt-C distance of 2.138 {\AA} for the C4Me4 ligand and 2.351 {\AA} for the C6Me6 ligand indicating a pronounced structural trans effect.",

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AU - Englert, Ulli

AU - Marken, Frank

PY - 1993/12/1

Y1 - 1993/12/1

N2 - Highly reactive cations [Pt(η4-C4Me4)(solv)x] 2+ (solv = acetone or nitromethane) can be obtained from [{Pt(η4-C4Me4)Cl2}] by chloride abstraction with AgCF3SO3. The solvento complex [Pt(η4-C4Me4)-(Me2CO) x][CF3SO3]2 reacts with cyclopentadines and with hexamethylbenzene to form the sandwich compounds [Pt(η4-C4Me4)(dienyl)]CF3SO 3 (dienyl = η5C5Me5, η5-C5H4Me or η5-C5H5) and [Pt(η4-C4Me4)(η6-C 6Me6)][CF3SO3] 2·Me2CO. The new compounds are characterised by 1H, 13C and 195Pt NMR spectroscopy and cyclic voltammetry. The structure of the hexamathylbenzene complex, determined by X-ray crystallography, reveals an average Pt-C distance of 2.138 Å for the C4Me4 ligand and 2.351 Å for the C6Me6 ligand indicating a pronounced structural trans effect.

AB - Highly reactive cations [Pt(η4-C4Me4)(solv)x] 2+ (solv = acetone or nitromethane) can be obtained from [{Pt(η4-C4Me4)Cl2}] by chloride abstraction with AgCF3SO3. The solvento complex [Pt(η4-C4Me4)-(Me2CO) x][CF3SO3]2 reacts with cyclopentadines and with hexamethylbenzene to form the sandwich compounds [Pt(η4-C4Me4)(dienyl)]CF3SO 3 (dienyl = η5C5Me5, η5-C5H4Me or η5-C5H5) and [Pt(η4-C4Me4)(η6-C 6Me6)][CF3SO3] 2·Me2CO. The new compounds are characterised by 1H, 13C and 195Pt NMR spectroscopy and cyclic voltammetry. The structure of the hexamathylbenzene complex, determined by X-ray crystallography, reveals an average Pt-C distance of 2.138 Å for the C4Me4 ligand and 2.351 Å for the C6Me6 ligand indicating a pronounced structural trans effect.

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DO - 10.1039/DT9930001979

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JO - Journal of the Chemical Society, Dalton Transactions

JF - Journal of the Chemical Society, Dalton Transactions

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Novel sandwich cations of platinum with tetramethyl-cyclobutadiene and cyclopentdienyl or hexamethylbenzene ligands

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