Tautomeric polymorphism in salicylideneamine derivatives: an X-ray diffraction and solid-state NMR study
| Autor: | Micheline Carles, William E. E. Stone, André Thévand, Hélène Pizzala |
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| Rok vydání: | 2000 |
| Předmět: |
Hydrogen bond
Carbon-13 NMR satellite Chemistry Organic Chemistry Nuclear magnetic resonance spectroscopy of nucleic acids Crystal structure Nuclear magnetic resonance crystallography Nuclear magnetic resonance spectroscopy Analytical Chemistry Inorganic Chemistry Crystallography Solid-state nuclear magnetic resonance X-ray crystallography Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 526:261-268 |
| ISSN: | 0022-2860 |
| DOI: | 10.1016/s0022-2860(00)00529-9 |
| Popis: | The crystal structure of the N-(3-hydroxysalicylidene)-4-methoxyaniline has been studied by single-crystal X-ray diffraction and solid-state NMR spectroscopy. This is the first example of a Schiff base derived from 3-hydroxysalicylaldehyde which displays in the asymmetric unit, four distinct molecules linked together in the crystal lattice by two types of intermolecular O–H⋯O hydrogen bonds and formed by two independent tetramers. The 13C CPMAS NMR study corroborates the above results; the presence of different tautomeric equilibria in the same crystal structure is demonstrated and a qualitative estimation of the equilibrium mixture composition is given. |
| Databáze: | OpenAIRE |
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