Concentration Dependence of Ion Pairing in Imidazolium-Based Ionic Liquid Solutions

Seoncheol Cha; Minho Lee; Doseok Kim

doi:10.1002/cphc.201800926

Concentration Dependence of Ion Pairing in Imidazolium-Based Ionic Liquid Solutions

Chemphyschem. 2019 Feb 4;20(3):482-488. doi: 10.1002/cphc.201800926. Epub 2019 Jan 4.

Authors

Seoncheol Cha¹, Minho Lee¹, Doseok Kim¹

Affiliation

¹ Department of Physics, Sogang University, Seoul, Korea.

PMID: 30565367
DOI: 10.1002/cphc.201800926

Abstract

Infrared vibrational spectroscopy was used to probe concentration-dependent ion pair dissociation of imidazolium-based ionic liquids with three different halide anions (I^- , Br^- , and Cl^- ) in deuterated chloroform. Dissociation of the ion pairs at low concentrations of ionic liquids was found to be the easiest for ionic liquid with Cl^- anion, the most electronegative anion among the three investigated. This anomalous trend of ion pair dissociation was explained in terms of varying interaction strength between the solvent (CDCl₃ ) and the anions investigated.

Keywords: IR spectroscopy; hydrogen bond structure; ion-pair structure; ionic liquids; ionicity.

Publication types

Research Support, Non-U.S. Gov't

Abstract

Publication types

Grants and funding