Acta Cryst. (2010). E66, o2622  [ doi:10.1107/S1600536810037608 ]

Naphthalene-1,8-dicarboxylic anhydride: a monoclinic polymorph

D. Zhao, F. F. Li and A. Y. Zhang

Abstract: A new type of naphthalene-1,8-dicarboxylic anhydride, C₁₂H₆O₃, was synthesized hydrothermally. Unlike the two previously reported polymorphs, which crystallize in the orthorhombic space groups P2₁2₁2₁ [Shok et al. (1971). Kristallografiya, 16, 500-502; Grigor'eva & Chetkina (1975). Kristallografiya, 20, 1289-1290] and Pbca [Shok & Gol'der (1970). Zh. Strukt. Khim. 11, 939-940], this present structure crystallizes in the monoclinic space group P2₁/c. In this structure, the planar [total puckering amplitude Q = 0.0362 (15)] molecules lie parallel to each other along the a axis.

Online 25 September 2010

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