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Molecules 2013, 18(5), 4986-5004; doi:10.3390/molecules18054986
Article

Spectroscopic Studies of Amino Acid Ionic Liquid-Supported Schiff Bases

1
,
2
,
3
 and
1,*
1 Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology, Szczecin, Al. Piastów 42, Szczecin 71-065, Poland 2 Department of Organic Chemical Technology, West Pomeranian University of Technology, Szczecin, ul. Pułaskiego 10, Szczecin 70-332, Poland 3 Faculty of Chemistry, A. Mickiewicz University, ul. Umultowska 89b, Poznań 61-614, Poland
* Author to whom correspondence should be addressed.
Received: 22 February 2013 / Revised: 8 April 2013 / Accepted: 17 April 2013 / Published: 29 April 2013
(This article belongs to the Special Issue Isotope Effects)
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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.
Keywords: amino acid ionic liquids; Schiff bases; deuterium isotope effect; intramolecular hydrogen bond amino acid ionic liquids; Schiff bases; deuterium isotope effect; intramolecular hydrogen bond
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Ossowicz, P.; Janus, E.; Schroeder, G.; Rozwadowski, Z. Spectroscopic Studies of Amino Acid Ionic Liquid-Supported Schiff Bases. Molecules 2013, 18, 4986-5004.

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