Poly[4,4′-imino­dipyridinium [di-μ(4)-isophthalato-κ(4) O:O′:O′′:O′′-di-μ(3)-iso­phthal­ato-κ(3) O:O′:O′′;κ(4) O:O′:O′′,O′′′-trizinc(II)] dihydrate]

In the title compound, {(C(10)H(11)N(3))[Zn(3)(C(8)H(4)O(4))(4)]·2H(2)O}(n), divalent Zn atoms are linked into trinuclear units featuring tetra­hedral, octa­hedral and distorted tetrahedral, octahedral and square-pyramidal coordination geometries. These trinuclear units are connected by isopthalate dianions into [Zn(3)(isophthalate)(4)](n) (2n−) anionic layers, which aggregate into the three-dimensional structure via hydrogen-bonding pathways mediated by doubly protonated 4,4′-imino­dipyridinium cations and water mol­ecules of crystallization. One solvent water mol­ecule was found to be disordered over two positions, each with a 50% site-occupancy factor.