ABSTRACT
The asymmetric unit of the title compound, C17H12Cl2N2O, contains one independent mol-ecule. The mol-ecule is not planar, the phenyl and pyridazine rings are twisted with respect to each other, making a dihedral angle of 29.96â (2)° and the di-chloro-phenyl ring is nearly perpendicular to the pyridazine ring, with a dihedral angle of 82.38â (11)°. In the crystal, pairs of N-Hâ¯O hydrogen bonds link the mol-ecules to form inversion dimers with an R 2 2(8) ring motif. The dimers are linked by C-Hâ¯O inter-actions, forming layers parallel to the bc plane. The inter-molecular inter-actions were investigated using Hirshfeld surface analysis and two-dimensional fingerprint plots, and the mol-ecular electrostatic potential surface was also analysed. The Hirshfeld surface analysis of the title compound suggests that the most significant contributions to the crystal packing are by Hâ¯H (31.4%), Clâ¯H/Hâ¯Cl (19.9%) and Câ¯H/Hâ¯C (19%) contacts.