Letter | Published:

Character of the Ligands in Dibenzene Chromium


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.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Fischer, E. O., and Fritz, H. P., in “Advances in Inorganic Chemistry and Radiochemistry”, 1, 55 (Academic Press, Inc., New York, 1959).

  2. 2

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

  3. 3

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

  4. 4

    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.

  6. 6

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

  7. 7

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

  8. 8

    Dyatkina, M. E., and Shustorovich, E. M., Russian J. Inorg. Chem., 4, 179 (1959).

  9. 9

    Weiss, E., and Fischer, E. O., Z. allg. anorg. Chem., 286, 142 (1956).

  10. 10

    Dunitz, J. D., Orgel, L. E., and Rich, A., Acta Cryst., 9, 373 (1956).

  11. 11

    Carradini, P., and Allegra, G., J. Amer. Chem. Soc., 81, 2271 (1959); 82, 2075 (1960).

  12. 12

    Jellinek, F., Acta Cryst., 11, 677 (1958).

  13. 13

    Mulay, L. N., Rochow, E. G., and Fischer, E. O., J. Inorg. Nucl. Chem., 4, 231 (1957).

  14. 14

    Cox, E. G., Cruickshank, D. W. J., and Smith, J. A. S., Nature, 175, 766 (1955).

  15. 15

    Langseth, A., and Stoicheff, B. P., Canad. J. Phys., 34, 350 (1956).

  16. 16

    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).

  17. 17

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

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.