Crystal structure, Hirshfeld surface analysis and inter­action energy and DFT studies of 1-methyl-3-(prop-2-yn-1-yl)-2,3-di­hydro-1H-1,3-benzo­diazol-2-one

In the title mol­ecule, C(11)H(10)N(2)O, the di­hydro­benzimidazol-2-one moiety is essentially planar, with the prop-2-yn-1-yl substituent rotated well out of this plane. In the crystal, C—H(Mthy)⋯π(ring) inter­actions and C—H(Prop)⋯O(Dhyr) (Mthy = methyl, Prop = prop-2-yn-1-yl and Dhyr = di­hydro) hydrogen bonds form corrugated layers parallel to (10[Image: see text]), which are associated through additional C—H(Bnz)⋯O(Dhyr) (Bnz = benzene) hydrogen bonds and head-to-tail, slipped, π-stacking [centroid-to-centroid distance = 3.7712 (7) Å] inter­actions between di­hydro­benzimidazol-2-one moieties. The Hirshfeld surface analysis of the crystal structure indicates that the most important contributions to the crystal packing are from H⋯H (44.1%), H⋯C/C⋯H (33.5%) and O⋯H/H⋯O (13.4%) inter­actions. Hydrogen-bonding and van der Waals inter­actions are the dominant inter­actions in the crystal packing. Computational chemistry calculations indicate that in the crystal, C—H⋯O hydrogen-bond energies are 46.8 and 32.5 (for C—H(Prop)⋯O(Dhyr)) and 20.2 (for C—H(Bnz)⋯O(Dhyr)) kJ mol(−1). Density functional theory (DFT) optimized structures at the B3LYP/6–311 G(d,p) level are compared with the experimentally determined mol­ecular structure in the solid state. The HOMO–LUMO behaviour was elucidated to determine the energy gap.