Bis(4-methyl-imidazolium) succinate succinic acid solvate.

In the title compound, 2C(4)H(7)N(2) (+)·C(4)H(4)O(4) (2-)·C(4)H(6)O(4), the asymmetric unit consists of two 4-methyl-imidazolium cations, one succinate dianion and one netrual succinic acid mol-ecule and within the latter components, the C-O, C=O and C O bonds are clearly evidenced from their relative distances. In the crystal structure, the individual components are linked by inter-molecular N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds into a two-dimensional network parallel to the (101) plane in which R(3) (3)(9), R(3) (3)(12) and R(4) (4)(18) hydrogen-bond motifs are present.