Next Article in Journal
Folate-Based Radiotracers for PET Imaging—Update and Perspectives
Next Article in Special Issue
Theoretical Study of H/D Isotope Effects on Nuclear Magnetic Shieldings Using an ab initio Multi-Component Molecular Orbital Method
Previous Article in Journal
A Lead (II) 3D Coordination Polymer Based on a Marine Cyclic Peptide Motif
Previous Article in Special Issue
Zero-Point Corrections for Isotropic Coupling Constants for Cyclohexadienyl Radical, C6H7 and C6H6Mu: Beyond the Bond Length Change Approximation
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)
Download PDF [281 KB, uploaded 18 June 2014]

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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Export to BibTeX |
EndNote


MDPI and ACS Style

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

View more citation formats

Supplement

Related Articles

Article Metrics

Comments

Citing Articles

[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert