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The structure of 2'-hydroxyflavonol [3-hydroxy-2-(2-hydroxyphenyl)-4H-1-benzopyran-4-one, C15H10O4] has been described in the triclinic system [Iinuma, Tanaka, Ito & Mizuno (1987). Chem. Pharm. Bull. 35, 660-667]. We describe here a new polymorph which crystallizes in the monoclinic system. The conformation, characterized by the torsion angle between the ![[gamma]](/logos/entities/gamma_rmgif.gif)
-benzopyrone moiety and the phenyl ring, is very similar to that described for the triclinic system. The conformation of 2',6'-dihydroxyflavone [2-(2,6-dihydroxyphenyl)-4H-1-benzopyran-4-one, C15H10O4] is determined by intermolecular hydrogen bonds. Hydroxyl groups form two sets of hydrogen bonds, with the O(2')-H group bonding to the carbonyl group of a neighbouring molecule along the b axis and the O(6')-H group bonding to the O(2') atom of a molecule located in the ab plane.
-benzopyrone moiety and the phenyl ring, is very similar to that described for the triclinic system. The conformation of 2',6'-dihydroxyflavone [2-(2,6-dihydroxyphenyl)-4H-1-benzopyran-4-one, C15H10O4] is determined by intermolecular hydrogen bonds. Hydroxyl groups form two sets of hydrogen bonds, with the O(2')-H group bonding to the carbonyl group of a neighbouring molecule along the b axis and the O(6')-H group bonding to the O(2') atom of a molecule located in the ab plane.
