Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (06): 747-751.doi: 10.3866/PKU.WHXB20060620

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Synthesis and Characterization of N-ester Appended Pyridine Task-specific Ionic Liquids

LI Xue-Hui;JIANG Yan-Bin;ZHANG Lei;LI Rong   

  1. Department of Chemical Engineering, Guangdong Provincial Laboratory of Green Chemical Technology, South China University of Technology, Guangzhou 510640, P. R. China; Research Center for the Chemical Reagent Engineering and Technology of Guangdong Province, Guangzhou 510280, P. R. China
  • Received:2005-10-28 Revised:2005-12-29 Published:2006-05-31
  • Contact: LI Xue-Hui E-mail:cexhli@scut.edu.cn

Abstract: A series of N-ester appended pyridinium task-specific ionic liquids (TSILs) were synthesized and characterized by 1H NMR, 13C NMR, FTIR, ESI-MS, and DSC. Experimental results showed that pyridinium TSILs containing the same anion had the same miscibility with conventional organic solvents. The miscibility between these N-ester appended pyridinium task-specific ionic liquids and ethyl acetate decreased for the grafted ester group. With increasing the carbon number of the appended ester group, the melt point of the pyridinium TSILs containing the same anion decreases. Pyridinium TSILs containing BF4or PF6anion had better thermal stability and the thermal decomposition temperature was as high as 300 ℃. The physical and chemical properties of TSILs could be adjusted by the modification of the cation with the N-ester appended functional group.

Key words: Task-specific ionic liquids, Ester appended, Pyridine, Characterization, Miscibility