Issue 42, 2010

Cu(i)-containing room temperature ionic liquids as selective and reversible absorbents for propyne

Abstract

A Cu(I)-containing room temperature ionic liquid (Cu-RTIL), prepared from CuCl and 1,3-dimethylimidazolium methylphosphite ([DMIM][MeHPO3]), was found to reversibly and selectively interact with propyne over propylene. Cu-RTIL exhibited 12 times higher propyne absorption capacity and 14 times higher ideal propyne/propylene selectivity than [DMIM][MeHPO3]. Fast atom bombardment (FAB)-mass spectral and computational results with Cu-RTIL (CuCl/[DMIM][MeHPO3] = 1/2) strongly imply that the Cu-RTIL contains stable methylphosphite-coordinated anionic Cu(I) species such as CuCl(MeHPO3) and Cu(MeHPO3)2. Computational studies on the optimized structures demonstrate that the preferential absorption of propyne over propylene in a Cu-RTIL originates from the difference in the interaction mode between the coordinated phosphite ligand and propyne or propylene. Strong π-complexation of propylene and propyne with Cu in Cu-RTIL is not observed.

Graphical abstract: Cu(i)-containing room temperature ionic liquids as selective and reversible absorbents for propyne

Supplementary files

Article information

Article type
Paper
Submitted
10 Mar 2010
Accepted
23 Aug 2010
First published
05 Oct 2010

Phys. Chem. Chem. Phys., 2010,12, 14196-14202

Cu(I)-containing room temperature ionic liquids as selective and reversible absorbents for propyne

J. H. Kim, J. Palgunadi, D. K. Mukherjee, H. J. Lee, H. Kim, B. S. Ahn, M. Cheong and H. S. Kim, Phys. Chem. Chem. Phys., 2010, 12, 14196 DOI: 10.1039/C004140H

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