2,2′:4,4′′:4′,4′′′-Quaterpyridine: synthesis, crystal-structure description, and Hirshfeld surface analysis

The title compound, 2,2′:4,4′′:4′,4′′′-quaterpyridine (Qtpy), C(20)H(14)N(4), crystallizes in the triclinic P [Image: see text] space group and has half of the mol­ecule in the asymmetric unit, corresponding to 4,4′-bi­pyridine (4,4′-bpy) that serves as the building block for the mol­ecule. C(4,4′-bpy)—N—C(4,4′-bpy) and/or N—C(4,4′-bpy)—C(4,4′-bpy) bond-angle parameters show that the 4,4′-bpy ligands are highly rigid, displaying values lower than the linear bond angle of 180°. In the crystal, the 4,4′-bpy units are seen to be facing each other in relatively close proximity. The most important inter­actions on the Hirshfeld Surface of the compound are C—H⋯N/H⋯N—C inter­actions (constituting 10.6% and 7.6% of the total surface).