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In the title compound, {(C10H11N3)[Zn3(C8H4O4)4]·2H2O}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 [Zn3(isophthalate)4]n2n− 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.

In the title compound, [Ni(C8H4O4)(C10H9N3)3] n , an NiII atom with octahedral coordination is bound by one chelating terephthalate (tp) dianion, two monodentate di-4-pyridylamine (dpa) ligands, and two bridging dpa ligands. These link the Ni atoms into one-dimensional [Ni(tp)(dpa)3] n coordination polymer chains that propagate along the b-axis direction. Interweaving pairs of chains stack in three dimensions via N—H...O hydrogen bonding.

In the title hydrated salt, C10H11N2+·C8H4O5−·3H2O, doubly protonated 4,4′-dipyridylamine mol­ecules engage in N—H⋯O hydrogen bonding with 5-hydroxy­isophthalate dianions to form undulating one-dimensional chains, which aggregate into three dimensions by O—H⋯O and N—H⋯O hydrogen-bonding patterns mediated by water mol­ecules of crystallization.