Crystal structure of potassium (1S)-D-lyxit-1-yl-sulfonate monohydrate

The title compound, K+center dot C5H11O8S-center dot H2O [systematic name: potassium (1S, 2S, 3S, 4R)-1,2,3,4,5-pentahydroxypentane-1-sulfonate monohydrate], formed by reaction of d-lyxose with potassium hydrogen sulfite in water, crystallizes as colourless square prisms. The anion has an open-chain structure in which the S atom, the C atoms of the sugar chain and the oxygen atom of the hydroxymethyl group form an essentially all-trans chain with the corresponding torsion angles lying between 178.61 (12) and 157.75 (10)degrees. A three-dimensional bonding network exists in the crystal structure involving coordination of two crystallographically independent potassium ions by O atoms (one cation being hexa- and the other octa-coordinate, with each lying on a twofold rotation axis), and extensive intermolecular O-H center dot center dot center dot O hydrogen bonding.