Spectroscopic Studies of Amino Acid Ionic Liquid-Supported Schiff Bases
Paula Ossowicz, Ewa Janus, Grzegorz Schroeder and 1 more
Molecules · 2013
doi:10.3390/molecules18054986 (opens in a new tab)
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Abstract
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 13C-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.
Abstract licence: CC BY
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