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
Fischer, E. O., and Fritz, H. P., in “Advances in Inorganic Chemistry and Radiochemistry”, 1, 55 (Academic Press, Inc., New York, 1959).
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Fritz, H. P., and Lüttke, W., Internat. Conf. Co-ord. Chem., London, April, 123. Special publication No. 13, The Chemical Society, London (1959). See also ref. 1, p. 105.
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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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DOI: https://doi.org/10.1038/187871a0
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