1-(6-Chloro-1-methyl-1H-imidazo[4,5-c]pyridin-4-yl)-3-(2-chloro­phen­yl)urea

In the title compound, C₁₄H₁₁Cl₂N₅O, the plane of the 1H-imidazo[4,5-c]pyridine ring system [r.m.s. deviation = 0.087 (19) Å] makes a dihedral angle of 4.87 (10)° with the terminal phenyl ring. An intra­molecular N—H...N hydrogen bond stabilizes the mol­ecular conformation. In the crystal, N—H...O hydrogen bonds link the mol­ecules into inversion dimers. These dimers are connected by π–π inter­actions between imidazole rings [shortest centroid–centroid distance = 3.4443 (14) Å].

Ethyl (4-{[(di­ethyl­carbamo­thio­yl)sulfan­yl]meth­yl}-2-oxo-2H-chromen-7-yl)carbamate

In the title compound, C₁₈H₂₂N₂O₄S₂, the 2H-chromene ring system is essentially planar (r.m.s. deviation = 0.012 Å). The mol­ecular conformation is stabilized by a C—H...O hydrogen bond. In the crystal, N—H...S and C—H...O hydrogen bonds occur, the former enclosing an R²₂(22) ring motif, and lead to the formation of a two-dimensional slab-like network lying parallel to (10-1). π–π inter­actions are observed between inversion-related aromatic rings [shortest centroid–centroid distance = 3.6300 (11) Å].

6-(4-Fluoro­phen­yl)-3-phenyl-7H-1,2,4-tri­azolo[3,4-b][1,3,4]thia­diazine

In the title compound, C₁₆H₁₁FN₄S, the dihedral angles between the triazole ring and the phenyl and fluoro­benzene rings are 23.22 (17) and 18.06 (17)°, respectively. The six-membered heterocyclic ring adopts a distorted envelope conformation, with the methyl­ene C atom as the flap. In the crystal, the mol­ecules are linked by two C—H...N and C—H...F inter­actions along [010], forming C(5), C(8) and C(13) chains repectively. C—H...π inter­actions involving the phenyl ring and π–π inter­actions [centroid–centroid separation for triazole rings = 3.5660 (18) Å] are also observed.

tert-Butyl 2-{[5-(4-cyano­phen­yl)pyridin-3-yl]sulfon­yl}acetate

In the title compound, C₁₈H₁₈N₂O₄S, the dihedral angle between the aromatic rings is 33.71 (9)° and an intra­molecular C—H...O hydrogen bond closes an S(6) ring. In the crystal, mol­ecules are linked by C—H...O and C—H...N hydrogen bonds to generate a three-dimensional network. A very weak aromatic π–π stacking inter­ction is also observed [centroid–centroid separation = 3.9524 (10) Å].

N-(6-Chloro-1-methyl-1H-imidazo[4,5-c]pyridin-4-yl)benzene­sulfonamide

The asymmetric unit of the title compound, C₁₃H₁₁ClN₄O₂S, contains two mol­ecules (A and B), in which the dihedral angles between the 1H-imidazo[4,5-c]pyridine system and terminal phenyl ring are 80.83 (10) and 62.34 (1)°. In the crystal, A–B dimers are linked by pairs of N—H...N hydrogen bonds, which generate R²₂(10) loops. The dimers are linked by C—H...O and C—H...Cl inter­actions, generating a three-dimensional network. Aromatic π–π stacking inter­actions [shortest centroid–centroid distance = 3.5211 (12) Å] are also observed.

1,1′,1′′,1′′′-(Oxydi­methane­tri­yl)tetra­kis­(4-fluoro­benzene)

In the title compound, C₂₆H₁₈F₄O₂, the dihedral angles between pairs of benzene rings linked to the same C atom are 80.55 (8) and 79.11 (7)°. The crystal packing features C—H...π inter­actions and shows stacking when viewed along the c axis.

1-(4-Chloro­phen­yl)-1H-1,2,4-triazol-5(4H)-one

In the title compound, C₈H₆ClN₃O, the dihedral angle between the 1,2,4-triazole and benzene rings is 4.60 (9)° and an intra­molecular C—H...O inter­action closes an S(6) ring. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R₂²(8) loops and C—H...O inter­actions link the dimers into [100] chains. Weak π–π stacking inter­actions [centroid–centroid distance = 3.644 (1) Å] are also observed.