Abstract
The structure of p-bromochlorobenzene has been investigated by Hendricks1, who found the spacegroup to be P21/a, and the number of molecules in the unit cell to be two. In an exactly repeating crystal structure, this would make it necessary for the molecule itself to have a centre of symmetry, which is, of course, impossible. Hendricks suggested that the symmetry of the crystal might be statistical, the halogen positions in the molecules composing the structure being filled at random by bromine or chlorine, or perhaps the two possible orientations of any given molecule, differing by 180°, were equally probable.
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References
Hendricks, S. B., Z. Krist., 84, 85 (1933).
Bezzi and Croatto ., Gazz. Chim. Ital., 72 318 (1942); Chem. Zentr., 1, 22 (1943); Chem. Abstracts, 31803 (1944).
de Laszlo, Proc. Roy. Soc., A, 146, 690 (1934).
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KLUG, A. Crystal Structure of Para-bromochlorobenzene. Nature 160, 570 (1947). https://doi.org/10.1038/160570a0
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DOI: https://doi.org/10.1038/160570a0
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