Orientational effects of hydrogen bonding in liquid-crystalline solutions containing Schiff bases
β Scribed by Burmistrov, V. A.; Alexandriysky, V. V.; Koifman, O. I.
- Book ID
- 118150734
- Publisher
- Taylor and Francis Group
- Year
- 1992
- Tongue
- English
- Weight
- 676 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0267-8292
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## Abstract Hydrogen bonding within the structures of three Schiff bases (**1**β**3**), obtained by condensation of 4βmethoxyβ, 5βmethoxyβ and 4,6βdimethoxysalicylaldehyde with methylamine, was investigated by measuring deuterium and tritium NMR isotope effects. The primary deuterium and tritium is
The 15N results reveal a difference in the extent of intramolecular hydrogen bond formation exhibited by the Schiffs base, compound 2, in solution and the solid state. Comparison of the 15N shielding changes observed, with those arising from protonation, provides the basis for a quantitative estimat