Crystal structure, Hirshfeld surface analysis and density functional theory study of benzyl 2-oxo-1-(prop-2-yn-1-yl)-1,2-di-hydro-quinoline-4-carboxyl-ate.

The title mol­ecule, C20H15NO3, adopts a Z-shaped conformation with the carboxyl group nearly coplanar with the di­hydro­quinoline unit. In the crystal, corrugated layers are formed by C—H⋯O hydrogen bonds and are stacked by C—H⋯π(ring) inter­actions. Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (43.3%), H⋯C/C⋯H (26.6%) and H⋯O/O⋯H (16.3%) inter­actions. The optimized structure calculated using density functional theory at the B3LYP/ 6–311 G(d,p) level is compared with the experimentally determined structure in the solid state. The calculated HOMO–LUMO energy gap is 4.0319 eV.