(3-Chloro­prop­yl)triphenyl­phospho­nium bromide

The title compound, C₂₁H₂₁ClP⁺Br⁻, is the bromide salt of a mixed aryl-alkyl phospho­nium cation. C–P–C angles span a range of 107.20 (10)–111.18 (10)°. The non-H atoms of the 3-chloro­propyl group adopt a staggered conformation [C–C–C–Cl torsion angle: −72.0 (3)°]. In the crystal, C—H...Br contacts connect the entities of the title compound into a double zigzag chain along b. These chains are linked into a supra­molecular layer lying parallel to (10-1) by C—H...π inter­actions.

3,5-Bis(4-fluoro­phen­yl)-1-(4-nitro­phen­yl)-4,5-dihydro-1H-pyrazole

In the title compound, C₂₁H₁₅F₂N₃O₂, a pyrazole derivative bearing three aromatic substituents, the central five-membered heterocyclic ring makes dihedral angles of 1.77 (14), 3.68 (13) and 72.15 (14)° with the three benzene rings. In the crystal, C—H...O and C—H...F inter­actions connect the mol­ecules into double layers parallel to the bc plane.

4-Methyl­phenyl quinoline-2-carboxyl­ate

In the title compound, C₁₇H₁₃NO₂, two mol­ecules crystallize in the asymmetric unit. The dihedral angle between the mean planes of the quinoline and benzene rings are 78.3 (4) and 88.2 (3)°. The carboxyl­ate group is twisted slightly from the quinoline ring by 7.1 (2) and 13.3 (4)°, respectively. In the crystal, weak C—H...O inter­actions are observed. Further stabilization is provided by weak π–π stacking inter­actions, with centroid–centroid distances of 3.564 (9)/3.689 (2) and 3.830 (1)/3.896 (5)Å, respectively.