2-Amino-5-methylpyridinium nitrate

In the title salt, C6H9N2 +·NO3 −, the 2-amino-5-methylpyridinium cation and the nitrate anion are cyclically linked through pyridinium and amine N—H⋯O hydrogen bonds [graph set R 4 3(12)]. These units are extended into a zigzag chain structure lying parallel to the a axis, through a second cyclic R 2 2(8) association involving amine N—H⋯O and aromatic C—H⋯O hydrogen bonds to nitrate O-atom acceptors.

In the title salt, C 6 H 9 N 2 + ÁNO 3 À , the 2-amino-5-methylpyridinium cation and the nitrate anion are cyclically linked through pyridinium and amine N-HÁ Á ÁO hydrogen bonds [graph set R 4 3 (12)]. These units are extended into a zigzag chain structure lying parallel to the a axis, through a second cyclic R 2 2 (8) association involving amine N-HÁ Á ÁO and aromatic C-HÁ Á ÁO hydrogen bonds to nitrate O-atom acceptors.
In the title salt ( Fig. 1), the 2-amino-5-methylpyridinium cation and the nitrate anion are cyclically linked through pyridinium and amine N-H···O hydrogen bonds [graph set R 3 4 (12) (Etter et al., 1990)] (Table 1). These units are extended into a one-dimensional zigzag chain structure lying parallel to the a axis, through a second cyclic R 2 2 (8) association involving amine N-H···O and aromatic C-H···O hydrogen bonds to nitrate O-acceptors (Fig. 2).

Figure 2
A view of the packing showing the zigzag chain parallel to the a axis. Hydrogen bonds are shown as dashed lines.

Special details
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq N1 0.3088 (