Chelation of Group-6 Metal Tetracarbonyl Fragments by Dicobalt Thioalkyne Complexes

Gelling, A. and Went, M.J. and Povey, D.C. (1993) Chelation of Group-6 Metal Tetracarbonyl Fragments by Dicobalt Thioalkyne Complexes. Journal of Organometallic Chemistry, 455 (1-2). pp. 203-210. ISSN 0022-328X. (The full text of this publication is not available from this repository)

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Abstract

Reactions of [Co2(mu-RSCH2C=CCH2SR)(mu-dppm)(CO)4] (dppm = bis(diphenylphosphino)methane) with [M(CO)4nbd] (nbd = norbornadiene) afford [Co2{mu-C2(CH2SR)2M(CO)4}(muA-dPPM)(CO)4] (M = Mo, W; R = Me, Et, (n)Bu, (t)Bu, Bz and M = Cr; R = Me, Et). The molecular structure of [Co2{mu-C2(CH2SMe)2Mo(CO)4}(mu-dppm)(CO)4] has been established by X-ray diffraction, and comprises a Co2(mu-dppm)(CO)4 unit transversely bridged by 2,7-dithio-4-octyne co-ordinated through the thioether sulphur atoms to a molybdenum tetracarbonyl moiety. The chelation of [Co2(mu-MeSCH2C=CCH2SMe)(mu-dppm)(CO)4] to the molybdenum centre produces a seven-membered ring which adopts a chair conformation, and the thiomethyl groups adopt a cis configuration with respect to the plane defined by the molybdenum and the two sulphur atoms. The mass spectra and NMR spectra of the new compounds are reported. The compounds display dynamic NMR behaviour which can be interpreted in terms of alkyne rocking and sulphur inversion.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: M. Nasiriavanaki
Date Deposited: 02 Aug 2009 19:31
Last Modified: 02 Aug 2009 19:31
Resource URI: http://kar.kent.ac.uk/id/eprint/22101 (The current URI for this page, for reference purposes)
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