Pimelic acid–urea (1/2)

Abstract

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 [10overline{1}]. Additionally, the chains are assembled into a three-dimensional framework via weak N—H...O interchain interactions.