Bis(3-Ammoniopropyl)Ethylenediaminium Bis(Squarate)

Abstract

In the crystal structure of the title compound, C<inf>8</inf>H <inf>26</inf>N<inf>4</inf>4+·-2C<inf>4</inf>O<inf>4</inf> 2-, 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 NH<inf>2</inf> + groups and squarate O atoms. All the H atoms of NH<inf>3</inf> + groups of the PAED cation also participate in hydrogen bonding with the O atoms of the Sq2- anion, contributing to the crystal packing. © 2006 International Union of Crystallography All rights reserved.