Crystal engineering via C—H⋯F and C—H⋯π interactions in two substituted indoles

The crystal structures of 1‐(4‐fluoro­phenyl)‐2‐phenyl‐4,5,6,7‐tetra­hydro‐1H‐indole, C₂₀H₁₈FN, and 1‐(4‐fluoro­phenyl)‐6,6‐di­methyl‐2‐phenyl‐4,5,6,7‐tetra­hydro‐1H‐indole, C₂₂H₂₂FN, have been determined in order to study the role of `organic fluorine' in crystal engineering. These mol­ecules pack in the crystal structure via different types of molecular motifs utilizing weak C—H?F and C—H?π interactions.