Spectroscopic Studies of Amino Acid Ionic Liquid-Supported Schiff Bases

Molecules

Paula Ossowicz¹  Ewa Janus²  Grzegorz Schroeder³ 

[1] Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology, Szczecin, Al. Piastów 42, Szczecin 71-065, Poland; E-Mail:;Department of Organic Chemical Technology, West Pomeranian University of Technology, Szczecin, ul. Pułaskiego 10, Szczecin 70-332, Poland; E-Mail:;Faculty of Chemistry, A. Mickiewicz University, ul. Umultowska 89b, Poznań 61-614, Poland; E-Mail:

关键词: amino acid ionic liquids;    Schiff bases;    deuterium isotope effect;    intramolecular hydrogen bond;   

DOI  :  10.3390/molecules18054986

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.