Abstract
PREVIOUS work on the crystal structure of azulene1 has shown that the apparent space group is P21/a (C 5 2h) with two molecules in the unit cell. This implies a centrosymmetric molecule, which is in conflict with the chemical evidence. The two most likely explanations of this discrepancy are: (a) that the implied centre of symmetry is only statistically true, and is due to rotating molecules or a disordered structure; or (b) that the absent spectra leading to the deduction of the space group P21/a are accidental, and that the true space group is really of lower symmetry. Gunthard2 has discussed these possibilities, and in recent work3 has shown that a comparison of the entropies of azulene and naphthalene (which has similar lattice dimensions) appears to confirm the presence of some disorder in the azulene crystal.
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