Crystal structure, Hirshfeld surface analysis and inter­action energy and DFT studies of 4-[(prop-2-en-1-yl­oxy)meth­yl]-3,6-bis­(pyridin-2-yl)pyridazine

The title compound, C(18)H(16)N(4)O, consists of a 3,6-bis­(pyridin-2-yl)pyridazine moiety linked to a 4-[(prop-2-en-1-yl­oxy)meth­yl] group. The pyridine-2-yl rings are oriented at a dihedral angle of 17.34 (4)° and are rotated slightly out of the plane of the pyridazine ring. In the crystal, C—H(Pyrd)⋯N(Pyrdz) (Pyrd = pyridine and Pyrdz = pyridazine) hydrogen bonds and C—H(Prp­oxy)⋯π (Prp­oxy = prop-2-en-1-yl­oxy) inter­actions link the mol­ecules, forming deeply corrugated layers approximately parallel to the bc plane and stacked along the a-axis direction. Hirshfeld surface analysis indicates that the most important contributions for the crystal packing are from H⋯H (48.5%), H⋯C/C⋯H (26.0%) and H⋯N/N⋯H (17.1%) contacts, hydrogen bonding and van der Waals inter­actions being the dominant inter­actions in the crystal packing. Computational chemistry indicates that in the crystal, the C—H(Pyrd)⋯N(Pyrdz) hydrogen-bond energy is 64.3 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.