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Two polymorphic forms of 2,5‐bis(4‐methoxy­carbonyl­phenyl)‐1,3,4‐oxa­diazo­le
Authors:  nter Reck,Ingo Orgzall,Burkhard Schulz,Birgit Dietzel
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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