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In the title mol­ecule, C 23 H 14 N 4 O, the dihedral angle between the pyridine rings of the phenanthroline unit is 4.43 (8)° and the dihedral angle formed by the nine essentially planar [maximum deviation 0.0389 (16)Å] non-H atoms of the benzimidazole unit and the naphthalene ring system is 74.22 (5)°. In the crystal, mol­ecules are linked by inter­molecular N—H⋯N and O—H⋯N hydrogen bonds, forming a three-dimensional network.

1-(1H-Imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol