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The Synthesis and Characterization of 2-Amino-3-methylpyridinium Dihydrogenmonophosphate: (C6H9N2)H2PO4
Authors:A. Oueslati  A. Touati  C. Ben Nasr  F. Lefebvre
Affiliation:1. Laboratoire de chimie des Matériaux , Faculté des Sciences de Bizerte , Zarzouna , Tunisie;2. Laboratoire de Chimie Organométallique de Surface , Ecole Supérieure de Chimie Physique Electronique, Villeurbanne Cedex , France
Abstract:
A new crystal of 2-amino-3-methylpyridinium dihydrogenmonophosphate has been prepared and characterized by X-ray crystallography, thermal analysis, and impedance and NMR spectroscopies. This compound crystallizes in the triclinic space group P /> with a = 7.343(2) Å, b = 7.987(2) Å, c = 8.116(4) Å, α = 77,62(3)°, β = 77,74(3)°, γ = 87,03(2)°, V = 454.3 (3)Å<sup>3</sup>, and Z = 2. The crystal structure was solved and refined to R = 0.030 with 1602 independent reflections. The atomic arrangement can be described as (H<sub>2</sub>PO<sub>4</sub> <sup>?</sup>)<sub>n</sub> polymeric chains anchoring the 2-amino-3-methylpyridinium cations through short hydrogen bonds. All ring atoms of the organic entity are coplanar. The exocyclic N atom is an electron receiving center, which is consistent with features of imino resonance evidenced by bond lengths and angles. Solid state <sup>31</sup>P, <sup>13</sup>C, and <sup>15</sup>N CP-MAS-NMR spectroscopies are in agreement with the X-ray structure. Ab initio calculations allow the attribution of carbons and nitrogen to the independent crystallographic sites.</td> </tr> <tr> <td align=
Keywords:Crystal structure  dihydrogenomonophosphate  impedance spectroscopy  nuclear magnetic resonance  X-ray diffraction
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