Article

Pseudopolymorphism in hydroxybenzophenones: the dihydrate of 2,2',4,4'-tetrahydroxybenzophenone.

Laboratório de Cristalografia, Instituto de Química, Universidade Federal de Alfenas, Alfenas, Brazil.
Acta crystallographica. Section C, Crystal structure communications (impact factor: 0.78). 04/2012; 68(Pt 4):o156-9. DOI:10.1107/S0108270112008748 pp.o156-9
Source: PubMed

ABSTRACT A dihydrate pseudopolymorph of bis(2,4-dihydroxyphenyl)methanone, C(13)H(10)O(5)·2H(2)O, (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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Keywords

3,4-dihydroxybenzophenone [Landre
 
Acta Cryst
 
Corrêa
 
crystal assembly
 
dihydrate pseudopolymorph
 
known monohydrate pseudopolymorph
 
Martins & Doriguetto
 
twofold axis