Investigations of solvent–solute interactions in room temperature ionic liquids using solvatochromic dyes

Abstract

Different measures of polarity and nucleophilicity of a range of ionic liquids have been investigated using two solvatochromic dyes; the polarity appears to be largely cation controlled, while the donor strength is entirely anion dependent.

Separation of Organic Nitrogen Compounds by Supported Liquid Membranes Based on Ionic Liquids

“…The values of solvent polarity ET(30) 19) for organic nitrogen compounds are about 40 kcal/mol and about 34 kcal/mol for aromatic compounds, suggesting that organic nitrogen compounds are more polar than aromatic compounds. The values of ET(30) for ionic liquids 20) are larger than 50 kcal/mol, suggesting that ionic liquids interact well with more polar compounds. Therefore, the present study found that permeation rates through the SLM based on ionic liquids were mainly controlled by the polarity of the permeating species; but species hydrophilicity should be considered if the polarities are similar.…”

Distribution Equilibria of Amphoteric 8-Quinolinol between 1-Alkyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide and Aqueous Phases and Their Effect on Ionic Liquid Chelate Extraction Behavior of Iron(III)

“…Although hydrophobic ILs have relatively high polarity, 22 many kinds of metal cations are extracted as neutral complexes in IL chelate extraction as well.…”

Reactions of excited-state benzophenone ketyl radical in a room-temperature ionic liquid

“…In contrast, it has been reported that E T (30) for Bmim-TFSA is 50-52 kcal/mol. 50 When we used 52 kcal/mol as E T (30), ν Stokes of BPH was calculated to be 2084 cm -1 , which represents a 384 cm -1 difference from the measured value. Because the fluorescence lifetime in Bmim-TFSA was the same as that in acetonitrile, the interaction of BPH(D 1 ) with Bmim-TFSA may have been similar to that with acetonitrile, as previously suggested by non-equilibrium molecular dynamics simulations.…”