2-(4-Chloro-phen-yl)-6-methyl-4-(3-methyl-phen-yl)quinoline

Ethyl 2-(3,5-difluorophenyl)quinoline-4-carboxylate: a second triclinic polymorph

The title compound, C18H13F2NO2, is a polymorph of the structure reported by Sunithaet al.[Acta Cryst.(2015), E71, o341–o342]. Both compounds crystallize in the triclinic space groupP-1. The principal difference between the two polymorphs lies in the orientation of the carboxylate substituents with respect to the planes of the quinoline ring systems. In the crystal, the packing features C—H...O hydrogen bonds together with short C—F...π and π–π interactions [inter-centroid distances of 3.8199 (11), 3.6825 (12) and 3.8722 (13) Å].

6,7-Dimethoxy-2,4-diphenylquinoline

In the title structure of the title compound, C₂₃H₁₉NO₂, two conformationally similar mol­ecules (A and B) comprise the asymmetric unit. The dihedral angle between phenyl rings bridged by the quinoline moiety are 76.25 (8)° in mol­ecule A and 70.39 (9)° in mol­ecule B. In the crystal, the independent mol­ecules are connected by C—H⋯O hydrogen bonds and the resulting dimeric aggregates are linked by π–π [inter-centroid distance = 3.7370 (8) Å] and C—H⋯π inter­actions, forming a three-dimensional architecture.

4-(Adamantan-1-yl)-2-(4-fluorophenyl)quinoline

In the mol­ecule of the title compound, C₂₅H₂₄FN, the dihedral angle between the best planes of the quinoline fragment (rings A and B) and the benzene ring (C) is 9.51 (4)°. In the crystal, mol­ecules are linked into centrosymmetric dimers via pairs of weak C—H⋯F inter­actions. The mol­ecules are stacked into chains along the a axis by weak off-set π–π inter­actions between the A and C rings of translation-related mol­ecules with a centroid–centroid distance of 3.6440 (2) Å.