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The title compound, C(28)H(20)N(2)O(2)·2H(2)O, comprises a Schiff base mol-ecule with an imposed inversion centre in the middle of p-phenyl-enediamine unit and water mol-ecules of crystallization. In the structure, the Schiff base mol-ecule is present as the keto-amino tautomer with a strong intra-molecular N-H⋯O hydrogen bond. The Schiff base mol-ecules and water mol-ecules of crystallization create infinite [010] columns through O-H⋯O hydrogen bonds. Inter-molecular attractions within columns are through additional π-π inter-actions [centroid-centroid distance = 3.352 (1) Å] between parallel Schiff base mol-ecules. The columns are joined into infinite (011) layers through weak C-H⋯O hydrogen bonds. The layers pack in an assembly by van der Waals attractions, only being effective between bordering non-polar naphthalene ring systems.

1-[(4-{[(2-Oxo-1,2-dihydronaphthalen-1-ylidene)methyl]amino}anilino)methylidene]naphthalen-2(1H)-one dihydrate