Single crystals of the γ-phase of p-dichlorobenzene have been grown from a saturated solution in diethyl ether at 250 K. Using precession x-ray diffraction data recorded at 260 K, the molecular packing has been found and group-refined. The unit cell is monoclinic, space group P21/a, a = 13.96, b = 6.06, c = 7.14 A, β = 149.44°. A discussion of previous results and a comparison of the or and γ-phases are given.
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Fourme et al. (1974) studied this question.
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