Acta Cryst. (2012). E68, o1021 [ https://doi.org/10.1107/S1600536812005557 ]
Abstract: The asymmetric unit of the title compound, C9H9N2+·C4H3O4-·0.5C4H4O4, consists of one 2-phenylimidazolium cation, one hydrogen fumarate anion and half a fumaric acid molecule, which lies on an inversion center. N-HO and O-HO hydrogen bonds connect the cations, anions and fumaric acid molecules into sheets parallel to the (102) plane.
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