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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Physico-chemical properties and phase behavior of the ionic liquid-β-cyclodextrin complexes.
Marek Rogalski1, Ali Modaressi, Pierre Magri
1LCP-A2MC, EA 4164, Université de Lorraine, Metz, France. rogalski@univ-metz.fr
International Journal of Molecular Sciences
|August 16, 2013
Summary
This study investigated beta-cyclodextrin (β-CD) solubility in ionic liquids (ILs) and solute interactions. Results show β-CD-IL interactions are temperature-dependent, but β-CD addition doesn't enhance aliphatic/aromatic separation selectivity.
Area of Science:
- Physical Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Ionic liquids (ILs) offer unique solvent properties for various applications.
- Beta-cyclodextrin (β-CD) is a host molecule capable of forming inclusion complexes.
- Understanding β-CD-IL interactions is crucial for developing novel separation and dissolution processes.
Purpose of the Study:
- To measure the solubility of β-CD in ILs and determine activity coefficients of various solutes.
- To investigate the intermolecular interactions and inclusion complex formation between β-CD and ILs at high temperatures.
- To analyze the solid-liquid phase diagrams of IL + β-CD binary systems and assess the impact of β-CD on separation selectivity.
Main Methods:
- Inverse gas chromatography (IGC) was employed to measure solute activity coefficients at infinite dilution.
- Solubility of β-CD in hydrophobic ILs was determined at 423 K.
- Solid-liquid phase diagrams (SLE) and eutectic points were measured for selected IL + β-CD systems.
- Infrared spectroscopy (IR) was used to characterize intermolecular interactions.
Main Results:
- Activity coefficients at infinite dilution revealed temperature-dependent inclusion complex formation between solutes and β-CD in ILs.
- The solubility of β-CD in ten hydrophobic ILs was determined at 423 K.
- Eutectic points were identified in IL-rich regions for studied IL + β-CD binary systems.
- Addition of β-CD to ILs did not improve the selectivity for separating aliphatic and aromatic hydrocarbons.
Conclusions:
- Intermolecular interactions and inclusion complex formation are significant in β-CD-IL systems.
- The temperature significantly influences the stability and formation of inclusion complexes.
- While β-CD shows solubility in ILs, its application in enhancing aliphatic/aromatic separation selectivity in these systems is limited.
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