Research Article: Pimelic acid–urea (1/2)

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 [10]. Additionally, the chains are assembled into a three-dimensional framework via weak N—H⋯O inter­chain inter­actions.

Partial Text

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 ▶).




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