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Acta Cryst. (2012). E68, o3068
[ doi:10.1107/S1600536812041025 ]

A monoclinic polymorph of 5-[(1H-benzimidazol-1-yl)methyl]benzene-1,3-dicarboxylic acid

H.-W. Kuai

Abstract: Crystals of the title compound, C16H12N2O4, were obtained accidentally by the hydrothermal reaction of 5-[(1H-benzo[d]imidazol-1-yl)methyl]isophthalic acid with manganese chloride tetrahydrate in the presence of KOH as alkaline reagent for the deprotonation. A triclinic polymorph of this structure has been reported previously from a similar reaction [Cheng (2011). Acta Cryst. E67, o3299]. The benzimidazole ring system is almost planar, with a maximum deviation from the mean plane of 0.020 (4) Å. The benzimidazole unit and benzene ring are inclined at a dihedral angle of 68.17 (4)°, reflecting the axial rotation of the flexible benzimidazolyl arm. In the crystal, pairs of O-H...O hydrogen bonds link adjacent molecules into inversion dimers. O-H...N contacts connect these dimers into zigzag chains along [010].

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