Bis(pyridine-κN){N (2),N (2′)-[1,1′-(pyridine-2,6-di­yl)diethyl­idyne]benzene­sulfono­hydrazonato-κ(5) O,N,N′,N′′,O′}nickel(II)

In the crystal structure of the title compound, [Ni(C(21)H(19)N(5)O(4)S(2))(C(5)H(5)N)(2)], the metal center is seven-coordinate, with an approximate penta­gonal-bipyramidal configuration. The Ni atom is chelated by a dianionic penta­dentate Schiff base via the pyridine N atom, the two azomethine N atoms and the two sulfonyl O atoms. The latter coordinate to Ni at different distances, viz. 2.3337 (12) and 2.7988 (12) Å. Two apically coordinated pyridine mol­ecules complete the seven-coordin­ate geometry. The dihedral angle between the two pyridine ring planes is 68.25 (6)°.