Poly[1H-imidazol-3-ium [di-μ-nitrato-sodium]]

In the title compound {(C 3 H 5 N 2 )[Na(NO 3 ) 2 ]} n , the Na I ion is coordinated by eight O atoms from three bidentate nitrate anions and two O atoms from two monodentate nitrate anions, displaying a bicapped trigonal–prismatic geometry. The imidazolium cation is essentially planar (r.m.s. deviation for all non-H atoms = 0.0018 Å). In the crystal, the Na I ions are connected by bridging nitrate ligands, forming layers parallel to (010). The imidazolium cations are sandwiched between these layers. Weak C—H⋯O hydrogen bonds link the layers into a three-dimensional network. In addtion, π–π inter­actions between the imidazolium rings [centroid–centroid distance = 3.588 (3) Å] are observed.