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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Speciation of chloroindate(III) ionic liquids.
David C Apperley1, Christopher Hardacre, Peter Licence
1Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE.
Dalton Transactions (Cambridge, England : 2003)
|August 18, 2010
Summary
Ionic liquid systems containing indium(iii) chloride were created and analyzed. The resulting chloroindate(iii) anions, such as tetrachloroindate, depend on the indium chloride concentration.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Ionic Liquids
Background:
- Ionic liquids offer tunable properties for diverse applications.
- Understanding the speciation of metal-containing ionic liquids is crucial for their development.
Purpose of the Study:
- To prepare and characterize chloroindate(iii) ionic liquid systems.
- To investigate the influence of indium(iii) chloride concentration on speciation.
Main Methods:
- Preparation of ionic liquid systems by mixing 1-alkyl-3-methylimidazolium chloride and indium(iii) chloride.
- Characterization using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and various spectroscopy techniques (NMR, XPS, EXAFS).
Main Results:
- Liquid ionic liquids formed at indium(iii) chloride mole fraction (χ(InCl3)) ≤ 0.50, while biphasic systems formed at χ(InCl3) > 0.50.
- Ionic liquids with excess organic chloride contained [InCl6]3−, [InCl5]2−, and [InCl4]− anions.
- Equimolar mixtures resulted in 1-alkyl-3-methylimidazolium tetrachloroindates(iii).
- Excess indium(iii) chloride led to suspensions of InCl3 in tetrachloroindate ionic liquid.
Conclusions:
- The speciation of chloroindate(iii) anions in ionic liquids is controllable by adjusting the InCl3 ratio.
- Tetrachloroindate(iii) is a stable species in these ionic liquid systems.
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