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The structure of the title compound, [Ni(C15H14N3S2)2]·H2O, has one mol­ecule in the asymmetric unit, along with a solvent water mol­ecule. The two different Schiff base moieties coordinate to the central NiII ion as tridentate N,N′,S-chelating ligands, creating a six-coordinate distorted octa­hedral environment [the smallest angle being 77.43 (7)° and the widest angle being 169.99 (7)°]. The mean planes of the two ligands are nearly orthogonal to each other with an angle of 89.53 (6)°. The packing of the complex is supported by O—H...N and O—H...S hydrogen bonding between the solvent water mol­ecule and the uncoordinated N and S atoms of neighbouring ligands.

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In the title compound, [Zn(C20H16N3S2)2]·CH3CN, two different Schiff base moieties coordinate to the central ZnII ion as tridentate N,N′,S-chelating ligands, creating a distorted octa­hedral environment [the smallest angle being 73.24 (6)° and the widest angle being 155.73 (7)°], with the two S atoms in cis positions. The dihedral angle between the mean planes of the two coordinating ligands is 83.65 (5)°. The crystal packing is consolidated by weak C—H...N hydrogen-bonding inter­actions.

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The title compound, [Zn(C15H14N3S2)2], contains two chemically equivalent Schiff base anions that are coordinated to the ZnII ion as tridentate N,N′,S-chelating ligands, creating a distorted octa­hedral environment [the smallest angle being 75.40 (6)° and the widest angle being 162.87 (6)°], with the two S atoms in cis positions. The dihedral angle between the mean planes of the two coordinating ligands is 85.65 (5)°. Weak C—H...S hydrogen bonds are also observed.

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The asymmetric unit of the title compound, [Ni(C15H14N3S2)2], consists of two independent mol­ecules with similar configurations. Each Ni2+ cation is coordinated in a cis-mode by two tridentate N,N′,S-chelating Schiff base ligands, creating a distorted octa­hedron [the smallest angle being 77.57 (7)° and the widest being 168.97 (7)° for one mol­ecule, and 78.04 (7) and 167.55 (7)° for the second mol­ecule]. The dihedral angle between the mean coordination planes of the two ligands is 86.76 (7)° for one and 89.99 (7)° for the second mol­ecule. π–π inter­actions between neighbouring pyridine rings with plane-to-plane distances of 3.540 (1) and 3.704 (1) Å are observed.

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The complete mol­ecule of the title complex, [Ni(C19H21N2OS2)2], is generated by the application of twofold symmetry. The NiII atom is N,S-chelated by two hydrazinecarbodithio­ate ligands, which provide an N2S2 donor set that defines a distorted square-planar geometry, the S atoms being approximately cis. The conformation of the chelate ring is an envelope with the NiII atom being the flap atom. The dihedral angle between the least-squares planes through the chelate rings = 30.10 (6)°. Supra­molecular chains propagated by glide symmetry along the c axis and mediated by C—H...N contacts feature in the crystal packing.

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In the title compound, C15H16N2S2, the central C2N2S2 unit is essentially planar (r.m.s. deviation = 0.047 Å) and forms dihedral angles of 68.26 (4) and 65.99 (4)° with the phenyl and benzene rings, respectively, indicating a twisted mol­ecule. Supra­molecular chains with a step topology and propagating along [100] feature in the crystal packing, mediated through N—H...S hydrogen bonds. The chains are consolidated into a three-dimensional architecture by C—H...π inter­actions.

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Two independent mol­ecules comprise the asymmetric unit of the title compound, C13H19N3OS, which differ in the conformations of the residues linking the thio­urea and the terminal benzene ring, as manifested in the Cm—Cm—Ca—Ca torsion angles [78.03 (16) and −93.64 (16)°, respectively; m = methyl­ene and a = aromatic]. The dihedral angles [84.40 (4) and 88.28 (5)°] formed between the thio­urea residue and the benzene ring indicate an almost orthogonal relationship. In each thio­urea residue, the N—H hydrogen atoms are anti, and the terminal N—H hydrogen atom forms an intra­molecular N—H...N hydrogen bond with the imine-N atom. In each case, the conformation about the imine C=N double bond [1.2812 (17) and 1.2801 (17) Å] is E. In the crystal, the mol­ecules are connected by N—H...S hydrogen bonds and these are connected into four mol­ecule aggregates via N—H...O hydrogen bonds, which are assembled into a two-dimensional array parallel to (011) via C—H...π and π–π inter­actions [ring centroid–centroid distance = 3.8344 (9) Å].

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In the title hydrazonodithio­ate, C21H19N3OS2, the amide group is twisted out of the plane through the S2C=N atoms: the C—N—N—C torsion angle is 139.71 (13)°. The pyridine ring forms dihedral angles of 52.96 (8) and 86.46 (8)° with the phenyl rings, and the latter are approximately orthogonal [dihedral angle = 76.42 (9)°]. Supra­molecular chains sustained by N—H...O hydrogen bonds and propagated by glide symmetry along the c axis are found in the crystal structure. The chains are consolidated into a three-dimensional architecture by C—H...O and C—H...N inter­actions.

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In the title disulfide, C16H18S2, the mol­ecule is twisted about the central S—S bond [the C—S—S—C torsion angle = 93.24 (7)°] and the dihedral angle between the benzene rings is 72.84 (7)°, indicating an almost orthogonal relationship; the methyl groups are orientated to the same side of the mol­ecule. The crystal packing features C—H....π inter­actions which consolidate a three-dimensional architecture.

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The title compound C8H15N3S has two mol­ecules in the asymmetric unit in which cis–trans isomerism is exhibited around the N(NH)C=S bonds. The cyclo­hexyl rings in both mol­ecules adopt a chair conformation. In the crystal, N—H...S hydrogen bonding produces dimers, which are inter­connected through further N—H...S hydrogen bonds, forming chains along the b-axis direction.
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