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The asymmetric unit of the title compound, C 16 H 13 N 2 O + ·NCS − ·C 16 H 12 N 2 O, contains two  N -(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules, both are partially protonated in the pyridine moiety,  i.e.  the H atom attached to the pyridine N atom is partially occupied with an occupancy factor of 0.61 (3) and 0.39 (3), respectively. In the crystal, protonated and neutral  N -(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules are linked by N—H⋯N hydrogen bonding; the thio­cyanate counter-ion links with both protonated and neutral  N -(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules  via  N—H⋯S and N—H⋯N hydrogen bonding. The dihedral angles between the pyridine ring and naphthalene ring systems are 11.33 (6) and 9.51 (6)°, respectively. π–π stacking is observed in the crystal structure, the shortest centroid–centroid distance being 3.5929 (8) Å. The crystal structure was determined from a nonmerohedral twin {ratio of the twin components = 0.357 (1):0.643 (1) and twin law [-100 0-10 -101]}.

4-(Naphthalene-2-carboxamido)pyridin-1-ium thiocyanate–N-(pyridin-4-yl)naphthalene-2-carboxamide (1/1)