Acta Cryst. (2012). E68, o190 [ doi:10.1107/S1600536811054043 ]
Abstract: The crystal structure of the title co-crystal, 2C6H7N3O·C6H10O4, is a second polymorph, designated form II, of the co-crystal formed between the two molecules [Lemmerer et al. (2011). CrystEngComm, 13, 55-59]. The asymmetric unit comprises one molecule of nicotinic acid hydrazide, and one half-molecule of adipic acid (the entire molecule is completed by the application of a centre of inversion). In the crystal, molecules assemble into a three-dimensional network of hydrogen bonds, formed by three N-HO hydrogen bonds and one O-HN hydrogen bond. The O-HN hydrogen bond formed between the carboxyl group and the pyridine ring is supported by a C-HO hydrogen bond.
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