Acta Cryst. (2003). E59, o1267-o1269  [ doi:10.1107/S1600536803016982 ]

Triethanolammonium dihydrogenphosphite

W. T. A. Harrison

Abstract: The title compound, [HN(C₂H₄OH)₃](H₂PO₃) or C₆H₁₆NO₃⁺·H₂PO₃^-, is isostructural with its hydrogenselenite congener and contains a network of partially disordered triethanolammonium cations and dihydrogenphosphite anions [for the latter species: d_av(P-O) = 1.514  (2)  Å and _av(O-P-O) = 111.9  (2)°]. The [H₂PO₃]^- units are linked into a polymeric chain by P-O-HO-P hydrogen bonds along the polar [010] direction, with the chains crosslinked into (001) sheets by way of O-HO bonds involving the organic species. Some C-HO interactions may also be present [d_av(HO) = 2.45  Å, _av(C-HO) = 158° and d_av(CO) = 3.364  (4)  Å]. The [HN(C₂H₄OH)₃]⁺ cation contains a typical trifurcated intramolecular N-H(O,O,O) hydrogen bond [d_av(HO) = 2.31  Å and _av(N-HO) = 112.7°].

Online 8 August 2003

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