Journal
MOLECULES
Volume 18, Issue 5, Pages 4986-5004Publisher
MDPI
DOI: 10.3390/molecules18054986
Keywords
amino acid ionic liquids; Schiff bases; deuterium isotope effect; intramolecular hydrogen bond
Funding
- Polish Ministry of Science and Higher Education [NN 204 338237]
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Amino acid ionic liquid-supported Schiff bases, derivatives of salicylaldehyde and various amino acids (L-threonine, L-valine, L-leucine, L-isoleucine and L-histidine) have been investigated by means of various spectroscopic techniques (NMR, UV-Vis, IR, MS) and deuterium isotope effects on C-13-NMR chemical shifts. The results have shown that in all studied amino acid ionic liquid-supported Schiff bases (except the L-histidine derivative) a proton transfer equilibrium exists and the presence of the COO- group stabilizes the proton transferred NH-form.
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