Acta Cryst. (2003). E59, o731-o733  [ doi:10.1107/S1600536803007669 ]

Ethylenediammonium bis(2-carboxylato-3,4,5,6-tetrahydro-2,6,6-trimethyl-2H-pyran-5-carboxylic acid) dihydrate [ethylenediammonium bis(hydrogen cineolate) dihydrate]

J. C. Barnes

Abstract: In the title compound, 2C₁₀H₁₅O₅·C₂H₁₀N₂·2H₂O, the asymmetric unit is one anion, half a cation and one water molecule. The hydrogen cineolate anion has virtually the same conformation as in racemic cineolic acid. The ethylenediammonium cation has a gauche conformation and possesses twofold crystallographic rotation symmetry. The anions form hydrogen-bonded layers parallel to the bc plane. Extensive hydrogen bonding to cations and water molecules connects pairs of these layers to form double layers half a unit cell thick.

Online 30 April 2003

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