Intermolecular CH⋯N/CH⋯O hydrogen bonds in the crystal structures of α,β-unsaturated ketones carrying a terminal pyridine subunit

α,β-Unsaturated ketones 1–4 carrying a terminal pyridine subunit form aggregates in the crystalline state with the molecules linked together through CH⋯N/CH⋯O hydrogen bonds. The hydrogen-bonding motifs are discussed.