2,2′-Iminodiethanaminium 2,2′-(disulfanyldiyl)dibenzoate dihydrate

Abstract

In the title hydrated salt, C4H15N3 2+·C14H8O4S2 −·2H2O, the dication (with both terminal –NH2 groups protonated) adopts a U-shaped conformation, the Namine—C—C—Naza­nium torsion angles being 57.9 (6) and 60.3 (6)°. The dianion is twisted: the central C—S—S—C torsion angle is 81.3 (2)° and the dihedral angle between the benzene rings is 85.4 (3)°. In the crystal, a chain in the a-axis direction mediated by water–carboxyl­ate O—H⋯O hydrogen bonds through a sequence of alternating 12-membered {⋯OCO⋯HOH}2 and eight-membered {⋯O⋯HOH}2 synthons occurs, which involves only one of the carboxyl­ate residues. The second carboxyl­ate residue participates in N—H⋯O hydrogen bonding, generating a three-dimensional network, along with aza­nium–water N—H⋯O hydrogen bonds.