3-{[(E)-(2-Hydroxynaphthalen-1-yl)methylidene]amino}pyridinium per­chlorate

In the title Schiff base salt, C(16)H(13)N(2)O(+)·ClO(4) (−), the pyridine ring and the naphthalene ring system are approximately co-planar [making a dihedral angle of 6.05 (12)°] and an intra­molecular O—H⋯N hydrogen bond occurs between the hydroxyl and imino groups. In the crystal, the cations and anions are linked by N—H⋯O and weak C—H⋯O hydrogen bonds, forming the supra­molecular layers parallel to (100). The crystal studied was an inversion twin refined with minor component = 0.43 (13).