Acta Cryst. (2008). E64, o400 [ doi:10.1107/S1600536807068122 ]
Abstract: In the title compound, C4H12O4P2, there are two crystallographically independent half-molecules in the asymmetric unit, both molecules lying on centres of symmetry. Each molecule is connected on both sides to neighbouring molecules via strong O-HO hydrogen bonds. The -POOH groups accept and donate one hydrogen bond in interactions with the neighbouring -POOH group of the adjacent molecule, to give one-dimensional chains along . As each phosphinic acid group donates and accepts one hydrogen bond, the connection between the molecules is best described by a ring motif which can be classified by the Etter symbol R22(8).
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