N—H...S and N—H...O hydrogen bonding in tetra-n-butyl­ammonium (imidazolidine-2-thione-2κS)dioxo-1κ²O-di-μ-sulfido-1:2κ⁴S:S-copper(I)tungstate(VI)

In the title complex, (C₁₆H₃₆N)[WCuO₂S₂(C₃H₆N₂S)], the W and Cu atoms have tetra­hedral and trigonal-planar coordination, respectively. Two sulfide ligands bridge the two metal centres; tungsten is additionally coordinated by two terminal oxo ligands and copper by the exocyclic S atom of imidazolidine-2-thione. There is an intra­molecular N—H...S hydrogen bond in the anion, and anions are linked into chains by N—H...O inter­molecular hydrogen bonds. The more loosely held cation is disordered.

α-Lactose monohydrate: a redetermination at 150 K

The structure of the monohydrate of α-4-(β-D-galactopyran­osido)-D-glucopyran­ose, more commonly known as α-lactose monohydrate, C₁₂H₂₂O₁₁·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.