Acta Cryst. (2006). E62, o1160-o1162 [ doi:10.1107/S1600536806006295 ]
Abstract: In the crystal structure of the title compound, C8H26N44+·2C4O42-, the bis(3-ammoniopropyl)ethylenediaminium (PAED) cation lies on an inversion centre and the squarate anion (Sq2-) is in a general position. Salt formation occurs by donation of four H atoms from two squaric acid molecules to the bis(3-aminopropyl)ethylenediamine base. In the crystal structure, the strongest interactions are between H atoms of NH2+ groups and squarate O atoms. All the H atoms of NH3+ groups of the PAED cation also participate in hydrogen bonding with the O atoms of the Sq2- anion, contributing to the crystal packing.
Online 24 February 2006
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