Crystal structure of 2-amino-5-nitro­pyridinium sulfamate

Acta Crystallographica Section E: Crystallographic Communications

Xavier, S.S.J.¹  NizamMohideen, M.²  Rajkumar, M.A.³  Devarajan, D.P.A.³  Anbarasu, S.³ 

[1]Department of Chemistry, St. Xavier's College (Autonomous), Palayamkottai 627 002, Tamil Nadu, India

[2]Department of Physics, The New College (Autonomous), Chennai 600 014, Tamil Nadu, India

[3]Physics Research Centre, Department of Physics, St. Xavier's College (Autonomous), Palayamkottai 627 002, Tamil Nadu, India

关键词: CRYSTAL STRUCTURE;    SULFAMIC ACID;    2-AMINO-5-NITROPYRIDINE;    SULFAMATE;    2-AMINO-5-PYRIDINIUM;    MOLECULAR SALT;    HYDROGEN BONDING.;   

DOI  :  10.1107/S2056989015000365

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The title mol­ecular salt, C5H6N3O2+ ·H2NO3S−, was obtained from the reaction of sulfamic acid with 2-amino-5-nitro­pyridine. 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 122.9 (3)°, with the pyridinium ring being essentially planar (r.m.s. deviation = 0.025 Å). In the crystal, the ion pairs are joined by three N—H⋯O and one N—H⋯N hydrogen bonds in which the pyridinium N atom and the amino N atom act as donors, and are hydrogen bonded to the carboxyl­ate O atoms and the N atom of the sulfamate anion, thus generating an R33(22) ring motif. These motifs are linked by further N—H⋯O hydrogen bonds enclosing R33(8) loops, forming sheets parallel to (100). The sheets are linked via weak C—H⋯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 0.737 (19):0.263 (19).

【 授权许可】

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