Abstract
LAST year, two of us gave a preliminary account1 of an X-ray analysis of crystalline benzene from which a C—C bond-length of 1.378 A. was derived by differential syntheses with finite series corrections. We have since been able, by means of electronic computor programmes devised by Miss D. Pilling of this Department, to calculate Fourier maps and difference maps in the plane of the molecule, which clearly show that the thermal motion is markedly anisotropic, and detailed quantitative study shows that it is such as to produce a systematic error in the bond-length which is by no means negligible.
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References
Cox, E. G., and Smith, J. A. S., Nature, 173, 75 (1954).
Andrew, E. R., and Eades, R. G., Proc. Roy. Soc., A, 218, 537 (1953).
Stoicheff, B. P., Can. J. Phys., 32, 339 (1954).
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Cox, E., CRUICKSHANK, D. & SMITH, J. Crystal Structure of Benzene: a New Type of Systematic Error in Precision X-Ray Crystal Analysis. Nature 175, 766 (1955). https://doi.org/10.1038/175766a0
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DOI: https://doi.org/10.1038/175766a0
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