Redetermination of α-D-glucosamine hydrochloride:: elucidation of the hydrogen-bonding scheme

The previously reported crystal structures [ Chu & Jeffery (1965). Proc. R. Soc. London Ser. A, 285, 470 - 479; Chandrasekharan & Mallikarjunan (1969). Z. Kristallogr. 129, 29] of the title compound, C6H14NO5+ center dot Cl-, have been confirmed to higher precision, and the H atoms located, allowing the elucidaton of the hydrogen- bonding network. A combination of O - H center dot center dot center dot O, N - H center dot center dot center dot O, O - H center dot center dot center dot Cl and N - H center dot center dot center dot Cl links results in a three- dimensional network. Considered by themselves, the inter- cation O - H O and N - H center dot center dot center dot O hydrogen bonds result in undulating (001) layers. The configurations of the chiral C atoms are: C1 S, C2 R, C3 R, C4 S and C5 R.