Letter | Published:

Character of the Ligands in Dibenzene Chromium

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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    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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    Wilkinson, G., and Cotton, F. A., in “Progress in Inorganic Chemistry”, 1, 1 (Interscience Publishers, Inc., New York, 1959).

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    Ruch, E., “Ber. Jahrestagung Chem. Ges. DDR, Leipzig”, 125 (1959).

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    Fischer, E. O., Internat. Conf. Co-ord. Chem., London, April 1959, 73. Special Publication No. 13, The Chemical Society, London (1959).

  5. 5

    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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    Fritz, H. P., Lüttke, W., Stammreich, H., and Forneris, R., Chem. Ber., 92, 3246 (1959).

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    Snyder, R. G., Spectrochim. Acta, 15, 807 (1959).

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    Brown, R. G., Trans. Farad. Soc., 55 694 (1959). Costain, C. C., and Stoicheff, B. P., J. Chem. Phys., 30, 777 (1959). Somayajulu, G. R., ibid., 31, 919 (1959).

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    For literature, see ref. 2, p. 77.

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