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Published on: March 24, 2018
Hydrogen-Bonding Motifs in Hydroxy-Functionalized Ionic Liquids
Anne Strate1, Dietmar Paschek1,2, Ralf Ludwig1,2,3
1Institute of Chemistry, University of Rostock, Rostock, Germany;
Hydroxy-functionalized ionic liquids (ILs) exhibit unique cationic clusters due to hydrogen bonding. This review explores these clusters in bulk and gas phases, revealing fundamental insights into IL interactions.
Area of Science:
- Physical Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Ionic liquids (ILs) possess unique properties governed by ion interactions.
- Hydroxy-functionalized ILs exhibit complex hydrogen bonding, forming ion pairs and cationic clusters.
- Understanding these hydrogen bonding motifs is crucial for IL applications.
Purpose of the Study:
- To review hydrogen-bonding motifs in hydroxy-functionalized ILs.
- To elucidate the formation and structure of cationic clusters in ILs.
- To provide fundamental insights into hydrogen bonding in ionic systems.
Main Methods:
- Infrared spectroscopy, nuclear magnetic resonance, neutron diffraction, and molecular dynamics simulations for bulk ILs.
- Cryogenic ion vibrational predissociation (CIVP) spectroscopy for gas-phase clusters.
- Density functional theory (DFT) calculations for theoretical analysis.
Main Results:
- Identified specific hydrogen-bonding motifs in both bulk and gas phases of hydroxy-functionalized ILs.
- Characterized the structure, strength, and dynamics of cationic clusters.
- Established detailed contacts within isolated hydrogen-bonded cationic clusters.
Conclusions:
- Hydrogen bonding plays a critical role in the unique properties and structure of hydroxy-functionalized ILs.
- The study provides a fundamental understanding of ion interactions and cluster formation in ILs.
- Combines experimental, computational, and theoretical approaches for comprehensive analysis.
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