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The reaction of nickel(II) nitrate with potassium seleno­cyanate and pyridazine leads to crystals of the title compound, [Ni(NCSe) 2 (C 4 H 4 N 2 ) 4 ]·2C 4 H 4 N 2 . The Ni II  atom is coordinated by two terminal  N -bonded seleno­cyanate anions and four pyridazine ligands within a slightly distorted octa­hedral geometry. The crystal structure contains two crystallographically independent pyridazine molecules in cavities of the structure, which are not coordinated to the metal centres. The structure is pseudo- C -centered due to the positioning of the discrete coordination complexes; the non-coordinating pyridazine molecules, however, break the  C -centering. In the subcell, these ligands are disordered around centres of inversion, which do not coincide with the mid-point of the mol­ecules.

Tetrakis(pyridazine-κN)bis(selenocyanato-κN)nickel(II) pyridazine disolvate