Three salts from the reactions of cysteamine and cystamine with L-(+)-tartaric acid.

Reaction between cyste­amine (systematic name: 2-amino­ethane­thiol, C2H7NS) and l-(+)-tartaric acid [systematic name: (2R,3R)-2,3-di­hydroxy­butane­dioic acid, C4H6O6] results in a mixture of cyste­amine tartrate(1−) monohydrate, C2H8NS+·C4H5O6−·H2O, (I), and cystamine bis­[tartrate(1−)] dihydrate, C4H14N2S22+·2C4H5O6−·2H2O, (III). Cystamine [systematic name: 2,2′-di­thio­bis­(ethyl­amine), C4H12N2S2], reacts with l-(+)-tartaric acid to produce a mixture of cystamine tartrate(2−), C4H14N2S22+·C4H4O62−, (II), and (III). In each crystal structure, the anions are linked by O—H⋯O hydrogen bonds that run parallel to the a axis. In addition, hydrogen bonding involving protonated amino groups in all three salts, and water mol­ecules in (I) and (III), leads to extensive three-dimensional hydrogen-bonding networks. All three salts crystallize in the ortho­rhom­bic space group P212121.