Synthesis of Tetracobalt Clusters from Dicobalt Alkne Complexes

Jeffery, J.C. and Pereira, R.M.S. and Vargas, M.D. and Went, M.J. (1995) Synthesis of Tetracobalt Clusters from Dicobalt Alkne Complexes. Journal of the Chemical Society-Dalton Transactions (11). pp. 1805-1811. ISSN 0300-9246. (The full text of this publication is not available from this repository)

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Abstract

The room-temperature reactions of [Co-2(mu-PhCCH)(CO)(6)] or [Co-2(mu-MeCCMe)(CO)(6)] with Ph(2)PC = CPh (L) afford [Co-2(mu-PhCCH)(CO)(5)(eta(1)-L)] or [Co-2(mu-MeCCMe)(CO)(5)(eta(1)-L)] and [CO2(mu-MeCCMe)(CO)(4)n(1)-L)(2)], respectively, in which L is bound via the phosphine functionality. The structure of [Co-2(mu-MeCCMe)(CO)(4)(eta(1)-L)(2)] has been established by X-ray crystallography and comprises two Co(CO)(2)(eta(1)-L) units bridged by a MeC = CMe ligand. Reactions of [Co-2(mu-R(1)CCR(2))(CO)(5)(eta(1)-L)] with [Co-2(CO)(8)] afford [Co-2(mu-R(1)CCR(2))(CO)(5)(mu-eta(1):eta(2)-L)Co-2(CO)(6)] (R(1) = Ph, R(2) = H; R(1) = R(2) = Me), in which L is bound to the Co-2(CO)(6) unit via the alkyne functionality. Pyrolysis of [Co-2(mu-MeCCMe)CO)(5)(mu-eta(1):eta(2)-L)Co-2(CO)(6)] results in phosphorus-carbon bond cleavage and cobalt-cobalt and carbon-carbon bond formation to afford a butterfly cluster [Co-4{mu(4)-eta(3)-PhCCC(Me)=C(Me)C(O)}(mu-PPh(2))(mu-CO)(2)(CO)(6)] whose structure has been established by X-ray diffraction.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences > Biomedical Research Group
Depositing User: P. Ogbuji
Date Deposited: 29 May 2009 09:17
Last Modified: 17 Jul 2012 14:15
Resource URI: http://kar.kent.ac.uk/id/eprint/19620 (The current URI for this page, for reference purposes)
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