Abstract

The asymmetric unit of the hydrated title compound, C26H42N62+·2Br−·1.5H2O, comprises one cation, two bromide anions and one and a half water molecules, as one water molecule is fully occupied and the other is only half occupied [0.500 (6)]. Both bromide ions are disordered over two sites with refined occupancies of 0.938 (3):0.062 (3) and 0.520 (9):0.480 (9). The C—N bond lengths in both central C3N units of the bisguanidinium ion range between 1.336 (3) and 1.349 (3) Å, indicating a degree of double-bond character. The central C atoms are bonded to the three N atoms in a nearly ideal trigonal–planar geometry and the positive charges are delocalized in both CN3planes. The crystal structure is stabilized by a three-dimensional network of O—H...O, O—H...Br and C—H...Br hydrogen bonds.

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