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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Miscibility and phase behavior of water-dicarboxylic acid type ionic liquid mixed systems
Yukinobu Fukaya1, Kenta Sekikawa, Kenichi Murata
1Department of Biotechnology, Tokyo University of Agriculture & Technology, Koganei, Tokyo, 184-8588, Japan.
Chemical Communications (Cambridge, England)
|July 20, 2007
Summary
Tetra-n-butylphosphonium ionic liquids with fumarate and maleate anions show distinct water solubility. Fumarate exhibits typical upper critical solution temperature (UCST) behavior, while maleate displays unusual lower critical solution temperature (LCST) behavior.
Area of Science:
- Physical Chemistry
- Materials Science
- Chemical Engineering
Background:
- Ionic liquids (ILs) are salts with low melting points, offering tunable properties.
- The relationship between IL structure, conformation, and phase behavior is crucial for applications.
- Understanding water miscibility is key for designing IL-based separation processes.
Purpose of the Study:
- To investigate the impact of cis-trans isomerism in anions on the physico-chemical properties of tetra-n-butylphosphonium ionic liquids.
- To compare the aqueous solubility and phase behavior of fumarate and maleate based ILs.
- To elucidate the mechanisms behind unusual temperature-dependent solubility in IL-water mixtures.
Main Methods:
- Synthesis and characterization of tetra-n-butylphosphonium fumarate and maleate ionic liquids.
- Solubility measurements in water across a range of temperatures.
- Analysis of phase diagrams and determination of critical solution temperatures (UCST/LCST).
Main Results:
- Tetra-n-butylphosphonium fumarate and maleate ILs exhibited distinct water solubility profiles.
- Fumarate-based IL showed typical Upper Critical Solution Temperature (UCST) behavior.
- Maleate-based IL displayed anomalous Lower Critical Solution Temperature (LCST) behavior, deviating from typical IL-water interactions.
Conclusions:
- The cis-trans conformation of the anion significantly influences the aqueous phase behavior of ionic liquids.
- Maleate anion's unique behavior highlights the potential for designing ILs with specific, non-conventional temperature-dependent solubility.
- These findings are relevant for designing novel separation technologies and functional materials.
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