A second polymorph of coumarin-3-carboxylic acid (2-oxo-2H- 1-benzopyran-3-carboxylic acid), C10H6O4, is reported in the P2(1)/c space group. The structure shows intermolecular hydrogen bonding between the carboxyl groups on pairs of molecules related by an inversion centre, as well as a number of C-H center dot center dot center dot O contacts.
|Number of pages
|Acta Crystallographica Section E: Structure Reports Online
|Published - Sept 2007