Solvent-free synthesis of protic ionic liquids. Synthesis, characterization and computational studies of triazolium based ionic liquids
Journal article, 2022

A series of triazolium and imidazolium based protic ionic liquids were synthesized using a solvent-free method designed to address several limitations encountered with other commonly used methods. Using this method, pure (98–99% m/m) and dry (128–553 ppm of water) protic ionic liquids were synthesized (in a laboratory scale) without the need for purification methods that require heating the ionic liquid, hence avoiding the common issue of thermal decomposition. This method was also designed to allow for the accurate measurement of acid and base, and for the controlled mixing of both compounds, which is essential to avoid producing impure protic ionic liquids with excess of either acid or base. The system is constructed of only glass and chemically resistant polymer (PTFE and PVDF) parts, which avoid other contaminants that can result from unwanted reactions involving the reagents with common laboratory tools (metallic objects, paper, plastic, etc.). This process is described in detail in the paper as well as in a video. The resulting ionic liquids were carefully analyzed by spectroscopic and thermal methods designed to avoid water absorption, which is known to affect their properties. To complement this experimental characterization, computational chemistry tools were used to assess the ionic liquids’ properties, as well as to assign vibrational modes.

Synthesis

Protic Ionic Liquid

DFT

Acidity

Solvent-free

Vibrational Assignment

Author

Eduardo Maurina Morais

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Iqbaal Abdurrokhman

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Anna Martinelli

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Journal of Molecular Liquids

0167-7322 (ISSN)

Vol. 360 119358

Combining acid-base chemistry with self-assembly for enhanced proton conduction in protic ionic liquids

Swedish Research Council (VR) (2018-05207), 2019-01-01 -- 2022-12-31.

Subject Categories

Inorganic Chemistry

Physical Chemistry

Materials Chemistry

Other Chemistry Topics

Theoretical Chemistry

Chemical Sciences

Organic Chemistry

Driving Forces

Sustainable development

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Areas of Advance

Materials Science

DOI

10.1016/j.molliq.2022.119358

More information

Latest update

6/17/2022