catena-Poly[[[bis­(1H-imidazole-κN³)zinc(II)]-μ₂-imidazol-1-ido-κ²N:N′] nitrate]

The title compound, {[Zn(C₃H₃N₂)(C₃H₄N₂)₂]NO₃}_n, is a one-dimensional coordination polymer along [01-1] with the Zn^II atom coordinating to four imidazole/imidazolide rings. The Zn^II atom has a regular tetra­hedral geometry with the planes of the two monodentate imidazole rings inclined to one another by 87.94 (17)°, while the planes of the bridging imidazolide rings are inclined to one another by 39.06 (17)°. In the crystal, the chains are linked via bifurcated N—H...(O,O) hydrogen bonds, forming sheets parallel to (001). These two-dimensional networks are linked via C—H...O hydrogen bonds and a C—H...π inter­action, forming a three-dimensional structure.