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In the title compound, C18H16N2O2, the central pyridazine ring forms dihedral angles of 77.08 (5)° and 84.62 (5)° with the two benzene rings. The dihedral angle between the two benzene rings is 68.18 (4)°. A very weak intramolecular C—H...N hydrogen bond and an intramolecular C—H...π interaction occur. The crystal structure is stabilized by weak intermolecular C—H...O hydrogen bonds and weak C—H...π and π–π stacking interactions [centroid–centroid distance = 3.6867 (10) Å].