Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.005 Å; R factor = 0.059; wR factor = 0.185; data-to-parameter ratio = 14.1.The title zwitterion,, C 16 H 11 ClN 2 O, is approximately planar, the dihedral angle between the benzene ring and naphthalene ring system is 1.55 (13) ; an intramolecular N-HÁ Á ÁO hydrogen bond stabilizes the planar conformation. In the crystal, -stacking between the benzene ring and the naphthalene ring system of adjacent molecules links the molecules into supramolecular chains running along the b axis, the centroid-centroid distance being 3.765 (2) Å .
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