Bis(1,3,4-thia-diazol-2-yl) disulfide.

The title compound, C(4)H(2)N(4)S(4), lies about a twofold rotation axis situated at the mid-point of the central S-S bond. Each of two thia-diazole rings is essentially planar, with an rms deviation for the unique thia-diazole ring plane of 0.0019 (7) Å. C-H⋯N hydrogen bonds link adjacent mol-ecules, forming zigzag chains along the c axis. In addition, these chains are connected by inter-molecular S⋯S inter-actions [S⋯S = 3.5153 (11) Å] , forming corrugated sheets, and further fabricate a three-dimensional supra-molecular structure by inter-molecular N⋯S contacts [S⋯N = 3.1941 (17) Å].

Poly[[tris-[µ-2,2'-(butane-1,4-diyl-dithio)bis-(1,3,4-thia-diazole)-κN:N]copper(II)] bis-(perchlorate)].

In the title compound, {[Cu(C(8)H(10)N(4)S(4))(3)](ClO(4))(2)}(n), the Cu(II) atom is located on a threefold inversion axis coordinated by six N atoms of symmetry-equivalent 2,2'-(butane-1,4-diyl-dithio)bis-(1,3,4-thia-diazole) ligands in a slightly distorted octa-hedral geometry. Adjacent Cu(II) atoms are linked by the bridging bidentate thia-diazole ligands, which are situated about inversion centers. This leads to the formation of a three-dimensional network structure.

catena-Poly[[[bis-[2,2'-(propane-1,3-diyl-dithio)bis-(1,3,4-thia-diazole)-κN]copper(II)]-bis-[µ-2,2'-(propane-1,3-diyldithio)bis-(1,3,4-thia-diazole)-κN:N]] bis-(perchlorate)].

In the title compound, {[Cu(C(7)H(8)N(4)S(4))(4)](ClO(4))(2)}(n), the Cu(II) atom, occupying a crystallographic inversion centre, is six-coordinated by six N atoms of three symmetry-related 2,2'-(propane-1,3-diyldithio)bis-(1,3,4-thia-diazole) (L) ligands in a slightly distorted octa-hedral geometry. The ligand L adopts two kinds of coordination modes in the crystal structure; one is a monodentate coordination mode and serves to complete the octa-hedral coordination of the Cu atom and the other is an N:N'-bidentate bridging mode in a trans configuration, bridging Cu atoms via translation symmetry along the b axis into a chain structure. The perchlorate ions serve as acceptors for inter-molecular C-H⋯O hydrogen bonds, which link the chains into a three-dimensional network.

Poly[[bis-(acetonitrile-κN)bis-[µ(2)-2,2'-(methyl-enedithio)bis-(1,3,4-thia-diazole)-κN:N]copper(II)] bis-(perchlorate) acetonitrile solvate].

In the title compound, {[Cu(C(5)H(4)N(4)S(4))(2)(C(2)H(3)N)(2)](ClO(4))(2)·C(2)H(3)N}(n), the Cu(II) atom occupies a crystallographic inversion centre and is six-coordinated by six N atoms of four symmetry-related 2,2'-(methyl-enedithio)bis-(1,3,4-thia-diazole) (L) ligands and two acetonitrile mol-ecules in a slightly distorted octa-hedral geometry. The ligand L adopts an N:N'-bidentate bridging mode in a trans configuration, bridging the Cu atoms via translation symmetry, forming a two-dimensional layer-like structure. The perchlorate ions serve as acceptors for inter-molecular C-H⋯O hydrogen bonds, which link the layers into a three-dimensional network. The ClO(4) (-) anion is disordered with an occupation ratio of 0.658:0.342.

Poly[µ(2)-chlorido-(µ(2)-3H-1,3,4-thia-diazo-lium-2-thiol-ato-κS:S)silver(I)].

In the title compound, [AgCl(C(2)H(2)N(2)S(2))](n), the Ag(I) ion has a distorted tetra-hedral geometry, defined by two S atoms of two symmetry-related 1,3,4-thia-diazo-lium-2-thiol-ate ligands and two chloride ions. The Ag(I) ions are bridged into a two-dimensional network parallel to the ab plane by chloride ions and thia-diazole ligands. In the network, the Ag(I) ions are separated by 4.0316 (12) Šalong the a axis and by 4.8822 (13) Šalong the b axis. N-H⋯Cl hydrogen bonds are observed within the network.