Ethylenediammonium Bis(monohydrogen oxalate) Monohydrate and Two Modifications of Trimethylenediammonium Bis(monohydrogen oxalate) Monohydrate

Essential features of the crystal structures of [NH₃(CH₂)_nNH₃]²⁺.2(HOOCCOO)^-.H₂O (0 < n < 6) are preserved through changes of conformation and space group. In each structure the cation and the water molecule occupy special positions. Linear hydrogen-bonded chains (Hoxalate)_n are parallel to and connected to hydrogen-bonded spirals in which the water molecules link anions and cations. Unique to each structure are additional hydrogen bonds, perpendicular to these chains, which connect cations and anions into three-dimensional arrays.

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