A second monoclinic polymorph of ethylenediammonium bis(hydrogen squarate) monohydrate

作者：Zenkhri Louiza^*; Bataille Thierry; Audebrand Nathalie

来源：Acta Crystallographica Section E-Structure Reports Online, 2011, 67: O1118-U365.

DOI：10.1107/S1600536811009019

The title compound, C2H10N22+center dot 2HC(4)O(4)(-)center dot H2O, a new polymorph of ethylenediammonium bis(hydrogen squarate) monohydrate, was synthesized by slow evaporation of an acid solution. The asymetric unit contains two hydrogen squarate anions, two half-molecules of protonated ethylenediamine arranged around a twofold axis and one water molecule. In the crystal, N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds between the hydrogen squarate anions, protonated N atoms from the amine group and water molecules lead to a three-dimensional framework. In particular, the cohesion between the squarate groups is ensured by very short intermolecular hydrogen bonds bonds. The title compound crystallized together with the previously reported polymorph [Mathew et al. (2002). J. Mol. Struct. 641, 263-279].

• 出版日期2011-5