N-(5-Sulfanyl­idene-4,5-dihydro-1,3,4-thia­diazol-2-yl)acetamide dimethyl sulfoxide disolvate

In the title compound, C₄H₅N₃OS₂·2C₂H₆OS, the five-membered heterocyclic ring and the N—(C=O)—C plane of the acetamide group are essentially co-planar, with a dihedral angle of 1.25 (3)°. Inter­molecular N—H...O hydrogen bonds between the acetamide compound and the dimethyl sulfoxide mol­ecules stabilize the crystal structure. The two dimethyl sulfoxide mol­ecules are each disordered over two positions with occupancy ratios of 0.605 (2):0.395 (2) and 0.8629 (18):0.1371 (18).

5-Eth­oxy-1,3,4-thia­diazole-2(3H)-thione

In the title compound, C₄H₆N₂OS₂, the dihedral angle between the five-membered heterocyclic ring and the plane of the eth­oxy group is 4.9 (2)°. The 1,3,4-thiadiazole-2-thione unit is planar, with an r.m.s. deviation of 0.011 Å from the corresponding squares plane defined by the seven constituent atoms. In the crystal, pairs of N—H...S hydrogen bonds link the mol­ecules into inversion dimers.

5,5′-[1,4-Phenyl­enebis(methyl­enesulfanedi­yl)]bis­[1,3,4-thia­diazol-2(3H)-one] dimethyl sulfoxide disolvate

The asymmetric unit of the title compound, C₁₂H₁₀N₄O₂S₄·2C₂H₆OS, contains one half of the p-xylene mol­ecule and one dimethyl sulfoxide mol­ecule. The p-xylene mol­ecule is located about a crystallographic inversion centre. In the mol­ecule, the thia­diazole and benzene rings are almost perpendicular to one another, with a dihedral angle of 88.95 (6)°. In the crystal, an N—H...O hydrogen bond is observed between the two components. The dimethyl sulfoxide mol­ecule is disordered over two orientations with an occupancy ratio of 0.879 (1):0.121 (1).

5-Amino-1,3,4-thia­diazol-2(3H)-one

The asymmetric unit of the title compound, C₂H₃N₃OS, contains three independent mol­ecules which are essentially planar, with r.m.s. deviations of 0.011 (2)–0.027 (2) Å from the mean plane defined by the seven non-H atoms. In the crystal, N—H...N and N—H...O hydrogen bonds link the mol­ecules into a sheet parallel to the (111) plane.

5-({3-[(5-Amino-1,3,4-thia­diazol-2-yl)sulfanylmeth­yl]benz­yl}sulfan­yl)-1,3,4-thia­diazol-2-amine

In the title compound, C₁₂H₁₂N₆S₄, the two terminal thia­diazole rings are twisted with respect to the central benzene ring, making dihedral angles of 54.28 (4) and 76.56 (3)°. The dihedral angle between the two thia­diazole rings is 27.77 (4)°. Inter­molecular N—H...N hydrogen bonds stabilize the crystal packing, linking the mol­ecules into a tape along the b axis.

[4-(2-tert-But­oxy-2-oxoeth­oxy)naph­thalen-1-yl]diphenyl­sulfonium trifluoro­methane­sulfonate

In the cation of the title salt, C₂₈H₂₇O₃S⁺·CF₃O₃S^-, the dihedral angle between the naphthalene ring system and the -C(=O)-O- plane is 80.39 (9)°. The three methyl groups of the tert-butyl group are each disordered over two orientations with an occupancy ratio of 0.712 (18):0.288 (18).