Related Experiment Video
Updated: Nov 2, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
The molecular behavior of pyridinium/imidazolium based ionic liquids and toluene binary systems
Hong Chen1, Zonghua Wang, Xianzhen Xu
1Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, College of Chemistry and Chemical Engineering, Instrumental Analysis Center of Qingdao University, Qingdao University, Qingdao 266071, China. zhouyu@qdu.edu.cn.
Abstract:
Imidazolium and pyridinium-based ionic liquids (ILs) have attracted increasing attention in the extraction of aromatic VOCs. However, fundamental studies on the mechanism of capturing aromatic VOCs have been less reported. In this work, the interactions between two ILs, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) and N-butylpyridinium bis(trifluoromethylsulfonyl)imide (BpyTFSI), and toluene (C6H5CH3), were investigated by using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), excess infrared spectroscopy, hydrogen nuclear magnetic resonance (1H NMR) spectroscopy and quantum chemical calculations. Some conclusions were obtained as follows: (1) H atoms on EMIMTFSI/BpyTFSI were located above or below the benzene ring and were mainly formed as C2-Hπ bonds and C2,6-Hπ bonds with C6H5CH3, respectively. C-Hπ bonds played a significant role in capturing aromatic compounds. (2) Upon adding C6H5CH3, the two IL-C6H5CH3 system's interaction strength was as follows: EMIMTFSI-C6H5CH3 > BpyTFSI-C6H5CH3. (3) Since C6H5CH3 was unable to disrupt the interactions between cations and anions of ion pairs in the two studied IL-C6H5CH3 systems, only ion cluster-C6H5CH3 and ion pair-C6H5CH3 complexes were observed. This work may provide theoretical insights into the separation mechanism for capturing VOCs.
More Related Videos
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
05:59Author Spotlight: Advancing Antimicrobial Resistance Research with Innovative Approaches and Synthetic Compounds
Published on: September 27, 2024
Related Concept Videos
Intermolecular Forces and Physical Properties
Mass Spectrometry: Aromatic Compound Fragmentation
Ideal Solutions
Basicity of Heterocyclic Aromatic Amines
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group...