Mixed Anthrone—Anthraquinone Crystals

Abstract

A THREE-DIMENSIONAL refinement of anthrone, C14H10O (recorded m.p. 154° C) by Srivastava1 has shown that it is isostructural with anthraquinone, C14H10O2 (recorded m.p. 286° C) (refs. 2 and 3). The unit-cell dimensions and other crystallographic data are: C14H10O, m.w. 194.22, P21/a, Z = 2 a = 15.80, b = 3.998, c = 7.86 Å β = 101.7° Dx = 1.326 g cm−3 (using corrected value N = 6.02335.1023 appropriate to the units used) C14H8O2, m.w. 208.20, P21/a, Z = 2 a = 15.83, b = 3.97, c = 7.89 Å β = 102.5° (at 20° C) Dx = 1.428 g cm−3 (corrected) The similarity between Weissenberg and other photographs of the two compounds is striking. There are small differences, of course, but they have to be looked for. The anthraquinone molecules are centrosymmetrical; the anthrone structure is disordered so that the two molecules in the unit cell each appear to be centrosymmetrical: The disorder causes the appearance of diffuse layer lines interleaving the 3.998 Å layer lines in anthrone rotation photographs taken about the b axis. Both structures are markedly pseudo-orthorhombic.

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References

  1. 1

    Srivastava, S. N., Acta Cryst., 17, 851 (1964).

  2. 2

    Murty, B. V. R., Z. Kristallog., 119, 445 (1960).

  3. 3

    El Sayed, K., thesis (London, 1965).

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HARRIS, J. Mixed Anthrone—Anthraquinone Crystals. Nature 206, 1038 (1965). https://doi.org/10.1038/2061038a0

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