Acta Cryst. (2013). E69, o1574-o1575 [ doi:10.1107/S1600536813025580 ]
Abstract: The asymmetric unit of the title molecular salt [systematic name: 1,4,8,11-tetraazacyclotetradecane-1,8-diium bis(3-carboxyprop-2-enoate)], C10H26N42+·2C4H3O4-, contains two half-cations (both completed by crystallographic inversion symmetry) and two maleate anions. The cyclam macrocycles adopt trans-III conformations, supported by two intramolecular N-HO hydrogen bonds. The O-bonded H atom of each maleate ion is disordered over two positions with an occupancy ratio of 0.61 (5):0.39 (5): each one generates an intramolecular O-HO hydrogen bond. In the crystal, the cations are linked to the anions by N-HO hydrogen bonds, generating  chains.
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