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Updated: May 14, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Noncovalent interactions in halogenated ionic liquids: theoretical study and crystallographic implications.
Haiying Li1, Yunxiang Lu, Weihong Wu
1Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai, China.
This study investigates halogenated ionic liquids, revealing that halogen bonds (C-X···O) and hydrogen bonds (C-H···O) significantly influence their structure and energetics. These findings aid in designing novel halogen-bonding ionic liquids for various applications.
Area of Science:
- Materials Science
- Computational Chemistry
- Supramolecular Chemistry
Background:
- Imidazolium-based ionic liquids with halogen substituents are gaining attention.
- Understanding noncovalent interactions is crucial for designing functional ionic liquids.
Purpose of the Study:
- To systematically investigate noncovalent interactions in halogenated ionic liquids.
- To compare structural and energetic properties with non-halogenated counterparts.
- To inform the design of novel halogen-bonding ionic liquids.
Main Methods:
- Density functional theory (DFT) calculations were employed.
- Investigation of ion pair structures and energetics.
- Comparison of calculated and experimental (X-ray crystallography) data.
Main Results:
- Identified key noncovalent interactions: C-X···O halogen bonds, C-H···O hydrogen bonds, and electrostatic interactions.
- Anion positioning over the imidazole ring was observed.
- Predicted halogen-bonded ring structures and conformers with combined C-H···O and C-X···O contacts, consistent with experimental data.
Conclusions:
- Halogen substituents significantly impact the structural and energetic properties of imidazolium ionic liquids.
- The findings provide insights into the role of halogen bonding in ionic liquid design.
- This research supports the development of new halogenated ionic liquids for applications like organic synthesis and gas absorption.
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