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The asymmetric unit of the title complex, [Ni(C16H32N4)]Br2·2H2O, contains two [Ni(C16H32N4)]2+ cations, four Br anions and four uncoordinated H2O mol­ecules. The Ni atoms are in a slightly distorted square-planar coordination by the four macrocyclic N atoms, which are almost coplanar [N—N—N—N torsion angles of 2.97 (6) and 3.12 (7)°]. In the crystal, a network of N—H...Br, O—H...Br and N—H...O hydrogen bonds leads to the formation of a chain structure.

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In the title compound, C25H22BrN3O5S, the central benzene ring makes dihedral angles of 32.02 (14), 37.49 (18) and 80.52 (13)°, respectively, with the pyrazolone ring, the bromo­benzene ring and the terminal phenyl ring. This conformation features a short intramolecular C—H...O contact that generates an S(6) ring. In the crystal, inversion dimers linked by pairs of C—H...O=C hydrogen bonds occur.
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