Bis[1-(eth­oxy­carbonyl­meth­yl)pyridinium] bis­(1,2-dicyano­ethene-1,2-dithiol­ato-κ²S,S′)nickelate(II)

The asymmetric unit of the title ion-pair complex, (C₉H₁₂NO₂)₂[Ni(C₄N₂S₂)₂], contains two 1-(eth­oxy­carbonyl­meth­yl)pyridinium cations and one bis­(1,2-dicyano­ethene-1,2-dithiol­ato)nickelate(II) dianion, which exhibits a slightly distorted square-planar coordination geometry. In the crystal, the cations are linked by strong C—H...O hydrogen bonds into C(6) chains along [100]. The cations and anions are linked into a three-dimensional architecture by weak C—H...N and C—H...S inter­actions.