A second polymorph of p-nitro­benz­amide

作者: Peter G. Jones , Holger Thönnessen , Reinhard Schmutzler , Axel K. Fischer

DOI: 10.1107/S1600536802021244

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摘要: The title compound, C7H6N2O3, crystallizes as a second P21/c polymorph. Compared to the previously known form [Di Rienzo et al. (1977). Acta Cryst. B33, 3854–3858], amide group is rotated much further out of ring plane (ca 20°). mol­ecules are linked by symmetric three-centre N—H(⋯Onitro)2, and N—H⋯Oamide hydrogen bonds layers parallel bc plane.

参考文章(1)
G. M. Sheldrick, Phase annealing in SHELX-90: direct methods for larger structures Acta Crystallographica Section A Foundations of Crystallography. ,vol. 46, pp. 467- 473 ,(1990) , 10.1107/S0108767390000277