Klein, Regina and Zech, Oliver and Maurer, Eva and Kellermeier, Matthias and Kunz, Werner (2011) Oligoether Carboxylates: Task-Specific Room-Temperature Ionic Liquids. JOURNAL OF PHYSICAL CHEMISTRY B, 115 (29). pp. 8961-8969. ISSN 1520-6106,
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Recently, a new family of ionic liquids based on oligoether carboxylates was introduced. 2,5,8,11-Tetraoxatridecan-13-oate (TOTO) was shown to form room-temperature ionic liquids (RTILs) even with small alkali ions such as lithium and sodium. However, the alkali TOTO salts suffer from their extremely high viscosities and relatively low conductivities. Therefore, we replaced the alkali cations by tetraalkylammonium (TAA) ions and studied the TOTO salts of tetraethyl(TEA), tetrapropyl-(TPA), and tetrabutylammonium (TBA). In addition, the environmentally benign quaternary ammonium ion choline (Ch) was included in the series. All salts were found to be ionic liquids at ambient temperatures with a glass transition typically at around 60 degrees C. Viscosities, conductivities, solvent polarities, and Kamlet-Taft parameters were determined as a function of temperature. When using quaternary ammonium ions, the viscosities of the resulting TOTO ionic liquids are > 600 times lower, whereas conductivities increase by a factor of up to 1000 compared with their alkali counterparts. Solvent polarities further reveal that choline and TAA cations yield TOTO ionic liquids that are more polar than those obtained with the, per se, highly polar sodium ion. Results are discussed in terms of ion-pairing and structure-breaking concepts with regard to a possible complexation
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHENOLATE BETAINE DYES; SOLVATOCHROMIC COMPARISON METHOD; SOLVENT POLARITY; ELECTROLYTE-SOLUTIONS; EMPIRICAL INDICATORS; TRANSPORT-PROPERTIES; SOLVATING SOLVENTS; LOW-VISCOSITY; PLUS WATER; CHOLINE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Jun 2020 05:46 |
| Last Modified: | 05 Jun 2020 05:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20524 |
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