Poly[bis­(1H-imidazole)bis­(μ(2)-1H-imidazolido)bis­(μ(2)-7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxyl­ato)trizinc(II)]

The title polymer, [Zn(3)(C(8)H(8)O(5))(2)(C(3)H(3)N(2))(2)(C(3)H(4)N(2))(2)](n), was formed by the reaction of zinc acetate with imidazole and 7-oxabicyclo­[2.2.1]heptane-2,3-dicarboxylic anhydride (norcan­tharidine). One of the two crystallographically unique Zn(II) atoms is four-coordinated by three N atoms of three imidazole ligands, two of which are deprotonated, and by one carboxyl­ate O atom of the demethyl­cantharate anion. The second Zn(II) atom is situated on an inversion centre and is six-coordinated by the bridging O atoms of two symmetry-related demethyl­cantharate anions and by four carboxyl­ate O atoms of the corresponding carboxyl­ate groups. The polymeric crystal structure is additionally stabilized by N—H⋯O hydrogen bonding between the imidazole ligands and carboxyl­ate O atoms.