Abstract
The title compound, C15H12N4O, adopts an E conformation with respect to the azomethine bond and crystallizes in its hydrazinylidene tautomeric form. The dihedral angle between the ring systems is 15.98 (7)°. The phenol O—H group forms an intramolecular O—H⋯N hydrogen bond. In the crystal, pairs of N—H⋯N and C—H⋯O hydrogen bonds link neighbouring molecules into centrosymmetric dimers. These dimers are interconnected by means of three types of π–π stacking interactions. One, with a centroid–centroid distance of 3.577 (1) Å [interplanar separation = 3.4673 (6) Å], connects adjacent molecules into centrosymmetric dimers. The other two interactions, on the outward facing sides of the dimers, are between phenol rings of neighboring molecules [centroid–centroid separation = 3.7907 (13) Å and interplanar separation = 3.5071 (8) Å], and between phthalazin units [centroid–centroid separation = 3.6001 (12) Å and interplanar separation = 3.4891 (7) Å]. In combination, the π–π interactions lead to the formation of infinite layers with molecules stacked along [0-11]. These layers are, in turn, connected with neighbouring layers through the N—H⋯N and C—H⋯O hydrogen bonds, yielding a three-dimensional supramolecular architecture.
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