2,3,5-Triphenyl-2H-tetra­zol-3-ium iodide

The asymmetric unit of the title mol­ecular salt, C₁₉H₁₅N₄⁺·I⁻, contains four 2,3,5-triphenyl-2H-tetra­zol-3-ium cations and five iodide anions, with two of the latter lying on crystallographic inversion centres. In each cation, the tetra­zole ring is essentially planar (r.m.s. deviations = 0.004–0.007 Å). The dihedral angles between the tetra­zole ring and its three attached benzene rings in the four independent cations are: 12.9 (4), 67.0 (4), 48.1 (4); 20.8 (4), 51.1 (4), 62.3 (4); 11.4 (4), 52.3 (4), 47.3 (4) and 6.0 (4), 85.7 (4), 43.5 (4)°. A C—H...I hydrogen bond and C—H...π inter­actions are observed in the crystal.

(Z)-2-Benzyl­idenebenzo[d]thia­zolo[3,2-a]imidazol-3(2H)-one

The mol­ecule of the title compound, C₁₆H₁₀N₂OS, is approximately planar, the dihedral angle between the 1,3-benzothia­zolo[3,2-a]imidazol-3(2H)-one and the benzyl­idene moieties being 4.10 (8)°. A weak intra­molecular C—H...S inter­action generates an S(6) ring. No inter­molecular hydrogen bonds are observed in the crystal structure.

1-(1,5-Diphenyl-4-phenyl­sulfonyl-1H-pyrazol-3-yl)ethanone

The asymmetric unit of the title compound, C₂₃H₁₈N₂O₃S, contains two mol­ecules with comparable geometries. In one mol­ecule, the pyrazole ring forms dihedral angles of 61.65 (11), 47.88 (11) and 63.20 (14)° with the three benzene rings. The corresponding values for the other mol­ecule are 77.19 (11), 43.55 (11) and 63.56 (15)°. In the crystal, both mol­ecules are linked into inversion dimers by pairs of C—H...S hydrogen bonds, generating R₂²(14) loops in each case.

3-Oxo-3-(piperidin-1-yl)propane­nitrile

In the title compound, C₈H₁₂N₂O, the piperidine ring exhibits a chair conformation and its least-squares plane (all atoms) makes a dihedral angle of 32.88 (12)° with the propane­nitrile unit (r.m.s. deviation = 0.001 Å). In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming chains along [001].

(Z)-2-(5-Acetyl-4-methyl-3-phenyl-2,3-dihydro-1,3-thia­zol-2-yl­idene)-3-(3-methyl-1-benzofuran-2-yl)-3-oxo­propane­nitrile

In the title compound, C₂₄H₁₈N₂O₃S, the benzofuran ring system (r.m.s. deviation = 0.010 Å) forms dihedral angles of 83.13 (17) and 8.92 (14)° with the benzene and thia­zole rings, respectively. The dihedral angle between the benzene and thia­zole rings is 84.51 (19)°. The mol­ecular structure features an intra­molecular C—H...O hydrogen bond, which closes an S(6) ring. There are no inter­molecular hydrogen bonds observed in this structure.