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Character of the Ligands in Dibenzene Chromium

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Abstract

THERE has been considerable discussion concerning the molecular symmetry of dibenzene chromium, (C6H6)2Cr (refs. 1 and 2). Theoretical considerations led Ruch3 to the assumption of a three-fold symmetry of the benzene ligands in the complex, the rings probably being slightly puckered4. Fritz and Lüttke5 stated that the infra-red absorption spectrum of (C6H6)2Cr was incompatible with six-fold symmetry and proposed molecular symmetry D3d. Recently, however, the same investigators6 changed their interpretation of the spectrum ; they proposed symmetry D6h both for the molecule (C6H6)2Cr and for the cation (C6H6)2Cr+ ; this conclusion was based on a study of the infra-red and Raman spectra, mainly of (C6H6)2CrI. Snyder7 also proposed an assignment of the infra-red spectrum of solid dibenzene chromium based on molecular symmetry D6h. Six-fold symmetry of the benzene ligands is also assumed by most other investigators in the field of arene metal compounds2,8.

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References

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  1. Anorganisch-chemisch Laboratorium, Rijksuniversiteit, Groningen

    F. JELLINEK

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  1. F. JELLINEK
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JELLINEK, F. Character of the Ligands in Dibenzene Chromium. Nature 187, 871–872 (1960). https://doi.org/10.1038/187871a0

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