Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10632035 | Materials Research Bulletin | 2005 | 10 Pages |
Abstract
A new crystal of 2-amino-3-methylpyridinium dihydrogenomonoarsenate has been prepared and characterized by X-ray crystallography, thermal analysis and spectroscopic studies. This compound crystallizes in the triclinic space group P1¯ with a = 7.2689 (2) Ã
, b = 8.0975 (2) Ã
, c = 8.3969 (4) Ã
, α = 77.09 (3)°, β = 79.20 (3)°, γ = 88.16 (2)°, V = 473.19 (3) Ã
3, ZÂ =Â 2. The crystal structure was solved and refined to RÂ =Â 0.027 with 3375 independent reflections. The atomic arrangement can be described as (H2AsO4â)n polymeric chains anchoring the 2-amino-3-methylpyridinium cations through short hydrogen bonds. All the 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 13C and 15N 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.
Related Topics
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Materials Science
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Authors
A. Oueslati, A. Rayes, C. Ben Nasr, F. Lefebvre,