Pseudopolymorphism in hydroxybenzophenones: the dihydrate of 2,2′,4,4′‐tetrahydroxybenzophenone
A dihydrate pseudopolymorph of bis(2,4‐dihydroxyphenyl)methanone, C13H10O5·2H2O, (I), was obtained during polymorphism screening of hydroxybenzophenone derivatives. This structure, in which the molecule sits on a twofold axis, was compared with the known anhydrous form of (I) [Schlemper (1982). Acta Cryst. B38, 554–559]. The role of water in the crystal assembly was established on the basis of the known monohydrate pseudopolymorph of 3,4‐dihydroxybenzophenone [Landre, Souza, Corrêa, Martins & Doriguetto (2010). Acta Cryst. C66, o463–o465].
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Document Type: Research Article
Publication date: April 15, 2012