Abstract
Using x-ray structural analysis we determined the structure of two crystal solvates with benzene: 2',4,4',6-tetranitro-2-carboxybiphenyl (composition 2:3, space group PI, Z = 2, 1464 reflections, R = 0.054) and 2'-nitro-2-carboxylphenyl (composition 2:1 space group P21/b, Z = 4, 1309 reflections, R = 0.030). The angles between the planes of the benzene rings and the acid molecules are 80.2 and 78.6 ~ . In the crystal the acidic molecules are joined into centrosymmetric dimers by carboxylcarboxyl hydrogen bonds (OH...O 2.687 and 2,635 ~). The benzene molecules atthe centers of symmetry are distributed between the eight-membered H-rings. The solvate benzene molecule in the general position is disordered.
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