Two polymorphic forms of 2,5‐bis(4‐methoxycarbonylphenyl)‐1,3,4‐oxadiazole |
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Authors: | Gü nter Reck,Ingo Orgzall,Burkhard Schulz,Birgit Dietzel |
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Abstract: | The title compound [systematic name: dimethyl 4,4′‐(1,3,4‐oxadiazole‐2,5‐diyl)diphenylenedicarboxylate], C18H14N2O5, crystallizes under similar conditions in two different orthorhombic crystalline forms. In both forms, the molecule consists of two equivalent parts. In form 1, these parts are related by a twofold axis of space group Pbcn, and in form 2, by a mirror plane of space group Cmc21. The O atom of the oxadiazole ring occupies a special position on the twofold axis and on the mirror plane in forms 1 and 2, respectively. |
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