Date Published: July 01, 2011
Publisher: International Union of Crystallography
Author(s): Wei Xu, Wen-xiang Huang, Hong-yan Chen.
The asymmetric unit, 2CH4N2O·C7H12O4, of the title cocrystal contains one urea molecule and a half-molecule of pimelic acid; the latter, together with a second urea molecule, are completed by symmetry, with the central atom of the whole pimelic acid moiety placed on a twofold crystallographic axis. The crystal packing is stabilized by O—H⋯O and N—H⋯O hydrogen-bond, generating a chain along . Additionally, the chains are assembled into a three-dimensional framework via weak N—H⋯O interchain interactions.
For urea inclusion compounds, see: Videnova-Adrabińska (1996a ▶); Harris & Thomas (1990 ▶); Yeo et al. (1997 ▶). For urea-dicarboxylic acid co-crystal engineering with predesigned crystal building blocks, see: Videnova-Adrabińska (1996b ▶); Chadwick et al. (2009 ▶); Chang & Lin (2011 ▶).