5-(3,5-Di­fluoro­phen­yl)-1-(4-fluoro­phen­yl)-3-tri­fluoro­methyl-1H-pyrazole

In the title compound, C₁₆H₈F₆N₂, the dihedral angle between the pyrazole and di­fluoro­benzene rings is 50.30 (13)°, while those between the pyrazole and fluoro­benzene rings and between the di­fluoro­benzene and fluoro­benzene rings are 38.56 (13) and 53.50 (11)°, respectively. Aromatic π–π stacking inter­actions between adjacent di­fluoro­benzene rings [centroid–centroid separation = 3.6082 (11) Å] link the mol­ecules into dimers parallel to [21-2].

N-(4-Meth­oxy­benzo­yl)-2-methyl­benzene­sulfonamide

In the title compound, C₁₅H₁₅NO₄S, the dihedral angle between the aromatic rings is 80.81 (1)° and the dihedral angle between the planes defined by the S—N—C=O fragment and the sulfonyl benzene ring is 86.34 (1)°. In the extended structure, dimers related by a crystallographic twofold axis are connected by pairs of both N—H...O hydrogen bonds and C—H...O inter­actions, which generate R₂²(8) and R₂²(14) loops, respectively. A weak aromatic π–π stacking inter­action is also observed [centroid–centroid separation = 3.7305 (3) Å].

2-Chloro-N-(4-meth­oxy­benzo­yl)­benzene­sulfonamide

In the title compound, C₁₄H₁₂ClNO₄S, the dihedral angle between the aromatic rings is 82.07 (1)° and the dihedral angle between the planes defined by the S—N—C=O fragment and the sulfonyl benzene ring is 82.46 (3)°. In the crystal, the mol­ecules are linked into C(4) chains running along [001] by strong N—H...O hydrogen bonds. A C—H...O intera­ction reinforces the [001] chains: its graph-set symbol is C(7). The chains are cross-linked into (100) sheets by further C—H...O inter­actions as C(6) chains along [001]. The structure also features weak π–π stacking inter­actions [centroid–centroid distances = 3.577 (1) and 3.8016 (1) Å].

N-Ethyl-2,2-dimethyl-N-(3-methyl­phen­yl)propanamide

In the title compound, C₁₄H₂₁NO, the conformation across the N—C(O) bond is syn-periplanar, the C—N—C—C torsion being −5.9 (5)°. The atoms of the ethyl group attached to the N atom are disordered over two sets of sites with occupancy ratios of 0.65 (2):0.35 (2) (CH₂) and 0.689 (14):0.311 (14) (CH₃)are linked by very weak C—H...O inter­actions forming C(8) chains along [001]. C—H...π inter­actions link the mol­ecules along the c-axis direction.

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].

3,4-Di­fluoro-2-hy­droxy­benzoic acid

In the title compound, C₇H₄F₂O₃, an intra­molecular O—H...O hydrogen bond is observed. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R₂²(8) ring motifs. These dimers are linked by C—H...O and C—H...F hydrogen bonds, forming sheets lying parallel to (30-1). The sheets are linked by aromatic π–π stacking inter­actions [inter-centroid distance = 3.7817 (9) Å], forming a three-dimensional structure.

5′-([1,1′-Biphen­yl]-4-yl)-1′,1′′,3′′-tri­methyl­dispiro[indane-2,2′-pyrrolidine-4′,5′′-[1,3]diazin­ane]-1,3,2′′,4′′,6′′-penta­one

In the title compound, C₃₀H₂₅N₃O₅, the central five-membered heterocyclic ring adopts an envelope conformation, with the N atom as the flap. The dihedral angles between this central ring and the pendant indane ring system, the trione and benzene rings are 87.49 (5), 82.95 (10) and 72.42 (10)°, respectively. The dihedral angle between the rings of the biphenyl group is 45.99 (13)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds into [101] C(12) chains.

Crystal structure of 1-tosyl-1,2,3,4-tetra­hydro­quinoline

In the title compound, C₁₆H₁₇NO₂S, the heterocyclic ring adopts a half-chair conformation and the bond-angle sum at the N atom is 350.2°. The dihedral angle between the planes of the aromatic rings is 47.74 (10)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds to generate [010] chains.