Poly[[[diaqua­zinc(II)]‐bis(μ2‐3‐cyano‐4‐dicyano­methyl­ene‐5‐oxo‐4,5‐dihydro‐1H‐pyrrol‐2‐olato‐κ2N3:N3′)] dihydrate]

The coordination of the 3‐cyano‐4‐dicyano­methyl­ene‐5‐oxo‐4,5‐dihydro‐1H‐pyrrol‐2‐olate anion to Zn^II, the apical sites of which are occupied by two water mol­ecules, results in the formation of two‐dimensional layers of the title coordination polymer, {Zn(C₈HN₄O₂)₂(H₂O)₂]·2H₂O}_n, in which the Zn^II cations lie on inversion centres in space group C2/c, with water ligands in the apical sites of octa­hedral geometry. Hydrogen bonds between coordinated and lattice water mol­ecules, and π–π stacking inter­actions between the anions link adjacent layers into a continuous framework.