Acta Cryst. (2007). E63, m1891  [ doi:10.1107/S1600536807023719 ]

Tetrakis(1,6-hexanediammonium) tetrakis(hydrogenarsenate) heptahydrate

M. J. Todd and W. T. A. Harrison

Abstract: The title compound, 4C₆H₁₈N₂²⁺·4HAsO₄^2-·7H₂O, contains a complex network of organic cations, hydrogenarsenate anions and water molecules. One of the two distinct (HAsO₄)^2- anions shows the expected distinction between protonated and unprotonated As-O bond lengths. The component species interact by way of N-HO and O-HO hydrogen bonds, with the latter leading to distinct centrosymmetric (HAsO₄)₄ tetramers, in which the central linking O-HO bond is assumed to be disordered about the inversion centre. Together, the cations and anions form an unusual three-dimensional framework encapsulating [100] channels occupied by the water molecules.

Online 13 June 2007

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