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Figure 2 Crystal packing of the title compound with intermolecular N—H⋯O hydrogen bonds, π—π and halogen—halogen interactions shown as dashed lines. H atoms not involved in intermolecular interactions have been omitted for clarity. Cg1 and Cg2 are the centroids of the phenyl and pyridazine rings, respectively. (Symmetry codes: i) 1 − x, 1 − y, −z; ii) x, 0.5 − y, + z; iii) −x, − + y, 1.5 − z; iv) 1 − x, 1 − y, 1 − z; v) −x, 1 − y, 1 − z; vi) −x, + y, 1.5 − z; vii) x, 1.5 − y, + z; viii) 1 − x, + y, 0.5 − z; ix) 1 − x, − + y, 0.5 − z). |