| Summary: | The asymmetric unit of the title 1:1 co-crystal, C10H8N2S2·C10H10O6, comprises two half-molecules, the bis(4-pyridyl) disulfide having twofold rotational symmetry and the 2,2′-[(p-phenylenebis(oxy)]diacetic acid having crystallographic inversion symmetry. In the disulfide molecule, the dihedral angle between the two pyridine rings is 86.8 (1)°, while the carboxyl groups of the substituted quinone lie essentially in the plane of the benzene ring [dihedral angle = 5.3 (1)°]. In the crystal, the components are linked via intermolecular O—H...N hydrogen bonds into zigzag chains which extend along c and are interlinked through C—H...π associations.
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