Die metall-kohlenstoff-bindung in carben- und carbin-komplexen. aussagen der 183W13C-kopplungen |
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Authors: | Frank Herwig Köhler Hans Jürgen Kalder Ernst Otto Fischer |
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Institution: | Anorganisch-Chemisches lnstitut der Technischen Universität München, D-8000 München-2, Arcisstrasse 21 Deutschland |
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Abstract: | The nuclear spin coupling constants1J(183W13C) and in some cases 2J(183W13C) and 3J(183W13C) are determined for 10 tungsten carbene and 9 tungsten carbyne complexes. 1J is of analytical importance, being characteristically greater for WC than for WC bonds. This is due to different hybridisation at the carbon atom, and provides information about bond angles and polarities of WC and WCR units.Substituents R and R' in (CO)5WCRR' and X(CO)4WCR as well as the halogens X lead to minor changes in 1J. These changes are comparable to those of 1J(13C1H) in correspondingly substituted methanes. Unexpectedly 1J in_ creases with X = Cl, Br, I. 2J(183W13C) though being much smaller than 1J reflects different hydridisation at the β carbon atom. |
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