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The crystal structure of the title compound, C 16 H 26 N 4 O 6 S 2 ·2H 2 O, a water-soluble di- N -heterocyclic carbene ligand precursor was determined using a single crystal grown by the slow cooling of a hot N , N -di-methyl-formamide solution of the compound. The dihydrate crystallizes in the monoclinic space group P 2 1 / c , with half of the zwitterionic mol-ecule and one water mol-ecule of crystallization in the asymmetric unit. The remaining part of the mol-ecule is completed by inversion symmetry. In the mol-ecule, the imidazole ring planes are parallel with a plane-to-plane distance of 2.741 (2) Å. The supra-molecular network is consolidated by hydrogen bonds of medium strength between the zwitterionic mol-ecules and the water mol-ecules of crystallization, as well as by π-π stacking inter-actions between the imidazole rings of neighbouring mol-ecules and C-H⋯O hydrogen-bonding inter-actions.

Crystal structure of zwitterionic 3,3′-[1,1′-(butane-1,4-diyl)bis(1H-imidazol-3-ium-3,1-diyl)]bis(propane-1-sulfonate) dihydrate