Synthesis and Properties of Chiral Ionic Liquid Based on( R)-Thiazolidine-2-thione-4-carboxylate

A novel series of chiral ionic liquids from( R)-thiazolidine-2-thione-4-carboxylic acid and hydroxide 1,3-dialkylbenzimidazole or hydroxide 1-alkyl pyridine was synthesized. The structures of the ionic liquids were confirmed by1 H NMR,13 C NMR,IR and ESI-MS. The optical rotation and p H value of the chiral ionic liquids were determined. Furthermore,the solubility,electrical conductivity and thermal stability of the ionic liquids were studied as well. The results revealed that the ionic liquids with weak acidity and good solubility in strongly polar organic solvents under room temperature. When the concentration of the ionic liquids in the aqueous solution was 1×10-3mol / L,increasing the conductivity was almost proportional to the temperature increases. The TGA results showed that the ionic liquids had two mass loss process under 150 and 250 ℃,caused by anion and cation,respectively.