I&EC 111 |
| To obtain a principle for ionic design of room temperature ionic liquids (RTILs) with desirable physical and chemical properties, typical RTILs were prepared with changing their cationic and anionic structures. To evaluate the ionicity of the RTILs, the molar conductivity ratio (Λimp/ΛNMR), calculated from the molar conductivity measured by electrochemical impedance method (Λimp) and that estimated by PGSE-NMR ionic self-diffusion coefficients and the Nernst-Einstein relation (ΛNMR), was introduced. The Λimp/ΛNMR well illustrates degree of formation of cation-anion aggregates in each ionic liquid under chemical equilibria, from the basis on experimental correlation of the Λimp/ΛNMR with anionic donor and cationic acceptor abilities estimated by solvatochromic UV-visible measurement. As a measure of electrostatic interaction of the RTILs, effective ionic concentration (Ceff) was introduced as a product of the Λimp/ΛNMR and molar concentration. Reduction of the Ceff for each RTIL well correlates with a decrease of reported cohesive energies and normal boiling points. |
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Ionic Liquids: Not Just Solvents Anymore OR Ionic Liquids: Parallel Futures (Sponsored by Green Chemistry and Engineering, Separation Science and Technology and Novel Chemistry with Industrial Applications Sub-Divisions)
8:00 PM-10:00 PM, Sunday, 26 March 2006 Georgia World Congress Center -- Ex. Hall B4, Poster
Division of Industrial and Engineering Chemistry |