Hexa­aqua­zinc(II) dinitrate bis­[5-(pyridinium-3-yl)tetra­zol-1-ide]

Hexa­aqua­zinc(II) dinitrate 5-(pyridinium-3-yl)tetra­zol-1-ide, [Zn(H(2)O)(6)](NO(3))(2)·2C(6)H(5)N(5), crystallizes in the space group P [Image: see text]. The asymmetric unit contains one zwitterionic 5-(pyridinium-3-yl)tetra­zol-1-ide mol­ecule, one NO(3) (−) anion and one half of a [Zn(H(2)O)(6)](2+) cation ([Image: see text] symmetry). The pyridinium and tetra­zolide rings in the zwitterion are nearly coplanar, with a dihedral angle of 5.4 (2)°. Several O—H⋯N and N—H⋯O hydrogen-bonding inter­actions exist between the [Zn(H(2)O)(6)](2+) cation and the N atoms of the tetra­zolide ring, and between the nitrate anions and the N—H groups of the pyridinium ring, respectively, giving rise to a three-dimensional network. The 5-(pyridinium-3-yl)tetra­zol-1-ide mol­ecules show parallel-displaced π–π stacking inter­actions; the centroid–centroid distance between adjacent tetra­zolide rings is 3.6298 (6) Å and that between the pyridinium and tetra­zolide rings is 3.6120 (5) Å.