The title compound, C3H3N3S3, is a triclinic modification. The other reported modification crystallizes with just one mol­ecule in the asymmetric unit, [Guo et al. (2006 ▶). Cryst. Growth Des. 6, 846–848] and was solved by power X-ray diffraction data. The present modification has Z′ = 2. In the crystal, mol­ecules are linked by strong intra­molecular N—H⋯S hydrogen bonds with set graph-motif R 2 2(8). In both mol­ecules, all of the N atoms and two of the S atoms are involved in hydrogen bonding, with an average H⋯S distance of 2.58 Å and N—H⋯S angles in the range 163–167°. π–π stacking inter­actions are not observed. In the solid state, the mol­ecules exist in the thione form. The mol­ecular and supra­molecular properties are similar in both polymorphs.

The title compound, [systematic name: 5a-acet­oxy­methyl-3-isopropyl-8-methyl-1,2,3,3a,4,5,5a,6,7,10,10a,10b-dodeca­hydro-7,10-endo-epidi­oxy­cyclo­hepta­[e]indene-3a-carb­oxy­lic acid], C22H32O6 (I), is closely related to methyl 5a-acet­oxy­methyl-3-isopropyl-8-methyl-1,2,3,3a,4,5,5a,6,7,10,10a,10b-dodeca­hydro-7,10-endo-epidi­oxy­cyclo­hepta­[e]indene-3a-carboxyl­ate, (II) [Brito et al., (2008 ▶). Acta Cryst. E64, o1209]. There are two mol­ecules in the asymmetric unit, which are linked by two strong intra­molecular O—H⋯O hydrogen bonds with graph-set motif R 2 2(8). In both (I) and (II), the conformation of the three fused rings are almost identical. The five-membered ring has an envelope conformation, the six-membered ring has a chair conformation and the seven-membered ring has a boat conformation. The most obvious differences between the two compounds is the observed disorder of the acet­oxy­methyl fragments in both mol­ecules of the asymmetric unit of (I). This disorder is not observed in (II). The crystal structure and the molecular conformation is stabilized by intermolecular C—H⋯O hydrogen bonds. The ability to form hydrogen bonds is different in the two compounds. The crystal studied was a non-merohedral twin, the ratio of the twin components being 0.28 (1):0.72 (1)

Two new dicationic ionic liquids 1,7-bis(3-methylimidazolium-1-yl)heptane bromide (I) and 1,8-bis(3-methylimidazolium-1-yl)octane bromide (II) have been synthesized and characterized by elemental analysis, FT-IR, 1 H and 13 C NMR, and TG-DSC techniques. The compound (I) is liquid at room temperature, whereas (II) is liquid at 42.7ºC.

Poster Sessions two distinct shapes. X-ray diffraction has shown these two crystals to be different forms (orthorhombic and cubic) of a cationic cluster of composition [Cu21(sacc)6(phen)12] 12+. The penta-anionic saccharate adopts a different binding mode in each of the copper clusters. The spaces between the copper clusters are also of interest. The cubic form has a cell length of 73.7 Å and each unit cell contains a void with an approximate volume of 30,000Å 3 .

The title compound, C14H20O5S·0.5H2O, crystallizes with two organic mol­ecules and a solvent water mol­ecule in the asymmetric unit. In both mol­ecules, the hexa­pyranosyl rings adopt a slightly distorted chair conformation (5 C 2) with four substituents in equatorial positions and one substituent in an axial position. The main difference between the organic mol­ecules is the dihedral angle between the phenyl ring and the best plane defined by the O—C1—C2—C3 atoms (r.m.s deviations = 0.003 and 0.043 Å) of the hexa­pyranosyl rings [47.4 (4) and 86.5 (4)°]. In the asymmetric unit, mol­ecules are linked by two strong O—H⋯O hydrogen bonds. In the crystal, the components are linked by a total of 10 distinct O—H⋯O hydrogen bonds, resulting in the formation of a two-dimensional network parallel to the ab plane.