A triclinic polymorph with Z = 3 of N,N′-bis(2-pyridyl)oxamide
| Autor: | Wan-Ju Zhang, Fang Wang, Gui-Ling Zhang, Xin Xiao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Acta Crystallographica Section E, Vol 67, Iss 4, Pp o972-o973 (2011) |
| Druh dokumentu: | article |
| ISSN: | 16005368 1600-5368 |
| DOI: | 10.1107/S1600536811010294 |
| Popis: | The asymmetric unit of the title compound, C12H10N4O2, contains three half-molecules. Each half-molecule is completed by crystallographic inversion symmetry. The title compound, (I), is a polymorph of the structure, (II), reported by Hsu & Chen [Eur. J. Inorg. Chem. (2004), 1488–1493]. In the original report, the compound crystallized in the tetragonal space group Poverline{4}21c (Z = 8), whereas the structure reported here is triclinic (Poverline{1}, Z = 3). In both forms, each oxamide molecule is almost planar (with maximum deviations are 0.266 and 0.166 Å) and the O atoms are trans oriented. The principal difference between the two forms lies in the different hydrogen-bonding patterns. In (I), two N—H...O and one N—H...N hydrogen bonds link the molecules, forming a two-dimensional network, whereas in (II) there are no classical hydrogen bonds to O atoms and only weak C—H...O interactions are found along with rings of N—H...N bonds. |
| Databáze: | Directory of Open Access Journals |
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