In the zwitterionic title compound, C(16)H(12)N(2)O, the dihedral angle between the benzene ring and naphthalene ring system is 2.0 (1)°. The azo group adopts a trans configuration and an intra-molecular N-H⋯O hydrogen bond is found. In the crystal, the mol-ecules are packed by strong π-π inter-actions [centroid-centroid distance between aromatic rings = 3.375 (3) Å].

中文翻译：

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1-[(苯基-亚氨基)氨基]-2-萘酚盐。

在两性离子标题化合物 C(16)H(12)N(2)O 中，苯环和萘环系之间的二面角为 2.0 (1)°。偶氮基团采用反式构型，并发现分子内NH⋯O氢键。在晶体中，分子由强 π-π 相互作用 [芳环之间的质心-质心距离 = 3.375 (3) Å] 填充。