RESUMO
The title mol-ecular salt, C5H6N3O2 (+) ·H2NO3S(-), was obtained from the reaction of sulfamic acid with 2-amino-5-nitro-pyridine. A proton transfer from sulfamic acid to the pyridine N atom occurred, resulting in the formation of a salt. As expected, this protonation leads to the widening of the C-N-C angle of the pyridine ring, to 122.9â (3)°, with the pyridinium ring being essentially planar (r.m.s. deviation = 0.025â Å). In the crystal, the ion pairs are joined by three N-Hâ¯O and one N-Hâ¯N hydrogen bonds in which the pyridinium N atom and the amino N atom act as donors, and are hydrogen bonded to the carboxyl-ate O atoms and the N atom of the sulfamate anion, thus generating an R (3) 3(22) ring motif. These motifs are linked by further N-Hâ¯O hydrogen bonds enclosing R (3) 3(8) loops, forming sheets parallel to (100). The sheets are linked via weak C-Hâ¯O hydrogen bonds, forming a three-dimensional structure. The O atoms of the nitro group are disordered over two sets of sites with a refined occupancy ratio of 0.737â (19):0.263â (19).
RESUMO
In the cation of the title mol-ecular salt, C5H6N3O2 (+)·C2HO4 (-), the dihedral angle between the aromatic ring and the nitro group is 3.5â (3)°; in the anion, the dihedral angle between the CO2 and CO2H planes is 10.5â (2)°. In the crystal, the anions are linked into [100] chains by O-Hâ¯O hydrogen bonds. The cations cross-link the chains by way of N-Hâ¯O hydrogen bonds and the structure is consolidated by C-Hâ¯O inter-actions.