Received 22 September 2012
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-HO hydrogen bonds link adjacent molecules into inversion dimers. O-HN contacts connect these dimers into zigzag chains along .
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2000) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ5265 ).
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Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.