Abstract
2,3,5,6-Tetraoxopiperazine (I), ammonium 2,3,5,6-tetraoxo-4-nitropyridinate crystal hydrate (II), co-crystallized dimethylammonium 2,3,5,6-tetraoxo-4-nitropyridinate and dimethylammonium chloride (III), and ammonium 2,6-dioxo-3,5-dinitropyridinate (IV) were isolated in the crystalline state and studied by X-ray diffraction. All heterocycles are planar and nonaromatic. They consist of two conjugated moieties linked together by C-C single bonds. The short C...O contacts (2.841–3.048 Å), which link the molecules to form zigzag two-dimensional chains, make a considerable contribution to the formation of the crystal structure of I, whereas hydrogen bonds that form three-dimensional networks play the most important role in the formation of the crystals of II–IV.
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Original Russian Text © O.V. Kovalchukova, Nguyen Dinh Do, A.I. Stash, S.B. Strashnova, B.E. Zaitsev, 2014, published in Kristallografiya, 2014, Vol. 59, No. 1, pp. 65–70.
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Kovalchukova, O.V., Do, N.D., Stash, A.I. et al. Crystal and molecular structures of selected oxidative nitration products of aminopyrazine and 2-amino-3-hydroxypyridine. Crystallogr. Rep. 59, 60–65 (2014). https://doi.org/10.1134/S1063774513060163
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DOI: https://doi.org/10.1134/S1063774513060163