α-Lactose monohydrate:: a redetermination at 150 K

The structure of the monohydrate of alpha-4-(beta-D-galactopyranosido)-D- glucopyranose, more commonly known as alpha-lactose monohydrate, C12H22O11 center dot H2O, has been previously studied by single-crystal diffraction at ca 296 K [Beevers & Hansen ( 1971). Acta Cryst. B27, 1323-1325; Fries et al. ( 1971). Acta Cryst. B27, 994-1005; Noordik et al. ( 1984). Z. Kristallogr. 168, 59-65]. This redetermination at low temperature [ 150 ( 2) K] shows improved precision of geometry. Graph-set analysis of the hydrogen-bonding motifs is presented for the first time.