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The crystal structure of ethylenediammonium bis (p-methylbenzenesulfonate) monohydrate, C2H10N22+·2(C7O3H7S-). H2O has been determined by X-ray diffraction techniques. The space group is P21, in 2 unit cell with a = 12.649 (2) Å, b = 7.727 (1) Å, c = 11.295 (2) Å, β =111.8(1)°, and z = 2. The structure was solved by direct methods and refined to R = 0.060 for 1134 reflections measured with Mo-Kα radiation. Two p-methylbenzenesulfonates, fragment A and B, from a pair through the hydrogen bonds to the ethylenediammonium ion. The sulfonate group in the fragment B are disordered. There are six unique hydrogen bonds, of which four are between the ethylenediammonium ion and the sulfonate groups and remaining two involve the water molecule.
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