metal-organic compounds
Open access
The title polymer, [Zn3(C8H8O5)2(C3H3N2)2(C3H4N2)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 ZnII 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 ZnII 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—HO hydrogen bonding between the imidazole ligands and carboxylate O atoms.