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Updated: Jun 16, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Published on: March 24, 2018

CO2 capture by fluorinated-imidazolium based ionic liquids: a multiple minima hypersurfaces analysis.

Jennifer Cuellar1,2, Osvaldo Yáñez3, Sol M Mejía1

  • 1Línea de Investigación en Química Computacional, Grupo de Investigación GIFUJ, Departamento de Química, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, Colombia.

Frontiers in Chemistry
|June 15, 2026
PubMed
Summary

Ionic liquids (ILs) show promise for CO2 capture, with fluorine substitution enhancing CO2 affinity. While some ILs exhibit high binding capacity, the capture process is not spontaneous under simulated conditions.

Keywords:
carbon dioxide capturedensity functional theoryintermolecular interactionsionic liquidsphysisorption

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) are recognized for their stability and potential in carbon capture technologies.
  • Developing efficient and environmentally friendly CO2 capture methods is crucial for mitigating climate change.

Purpose of the Study:

  • To theoretically evaluate twelve distinct ionic liquids for their CO2 capture capabilities.
  • To investigate the interactions between various ionic liquids and CO2 molecules, up to five per cluster.
  • To understand the influence of IL structure and fluorine substitution on CO2 affinity.

Main Methods:

  • Utilized a stochastic dynamic search algorithm to generate IL-CO2 cluster structures (n=1-5 CO2 molecules).
  • Employed Density Functional Theory (DFT) calculations for optimizing molecular clusters and analyzing interactions.
  • Investigated physisorption mechanisms, van der Waals forces, and exothermic cluster formation.

Main Results:

  • CO2 physisorption was observed, with preferential interaction occurring at the anion site.
  • Fluorine substitution in ILs was found to increase CO2 affinity.
  • Exothermic cluster formation was favored at lower temperatures, driven by van der Waals forces.
  • [Dbim]+[FAP]-, [C8H4F13mim]+[BF4]-, and [C8H4F13mim]+[TFO]- ILs exhibited the highest CO2 binding capacity.

Conclusions:

  • The study provides insights into the CO2 binding mechanisms of ILs, highlighting the role of anions and fluorine substitution.
  • While high binding capacity was observed for specific ILs, the CO2 capture process was not spontaneous under the simulated conditions.
  • Findings can guide the rational design of advanced IL-based materials for efficient CO2 capture applications.