Some hydroxyquinoline carboxylic acids and their conjugate acids and bases were characterized by 13 C and 15 N NMR spectroscopy in solution and in the solid state. Differences in 13 C and, in particular, 15 N chemical shift patterns allow to distinguish between individual tautomers and confirm the p
On the tautomerism of the thymine anion in the solid state: A Raman and infrared study
✍ Scribed by Bernhard Lippert
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 971 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
Abstract
Solid state infrared and Raman spectra of thymine, thymine monohydrate, three types of chloro(thyminato‐N1)ethylenediamineplatinum(II) complexes and three types of potassium thyminate (trihydrate, monohydrate, anhydrous compound) are reported and compared. The effects of hydrogen bonding, intermolecular coupling, crystal symmetry and tautomerism are discussed. For the anhydrous potassium thyminate a tautomeric structure, different from that found in the tri‐ and monohydrate, is postulated.
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The 13 C cross-polarization magic angle spinning NMR spectra of N-( ) indicate a keto-hydroxy tautomerism of 1 but not of 2. This was confirmed by a single-crystal x-ray diffraction study of 1, which revealed that the two distinct molecules in the unit cell are linked by intermolecular hydrogen bon