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An international journal for chemical science
REVIEW

Micellar Catalysis and Reactivity in Nanostructured Ionic Liquids: Two Sides of the Same Coin?

Navjot K. Kahlon A B and Cameron C. Weber https://orcid.org/0000-0002-3626-7618 A B C
+ Author Affiliations
- Author Affiliations

A School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland 1010, New Zealand.

B The MacDiarmid Institute for Advanced Materials and Nanotechnology, PO Box 600, Wellington 6140, New Zealand.

C Corresponding author. Email: cameron.weber@auckland.ac.nz




Navjot Kaur Kahlon obtained her B.Sc. Chem. (Hons) and M.Sc. from the University of Delhi. She is currently doing her Ph.D. under the supervision of Dr Cameron Weber in the School of Chemical Sciences at the University of Auckland, examining reactivity within nanostructured ionic solvents.



Cameron obtained his B.Sc.(Adv)(Hons) and Ph.D. from the University of Sydney under the supervision of Associate Professor Tony Masters and Professor Thomas Maschmeyer. Following post-doctoral positions with Professor Allan Myerson (MIT) and then Professor Tom Welton (Imperial College), Cameron received a Marie Curie Individual Fellowship held at Imperial College. He was subsequently appointed as a lecturer at the Auckland University of Technology before taking up his current position as Senior Lecturer and Deputy Director of the Centre for Green Chemical Science at the University of Auckland. His research involves investigating the use of alternative solvents for chemical processes.

Australian Journal of Chemistry 75(2) 9-23 https://doi.org/10.1071/CH21109
Submitted: 6 May 2021  Accepted: 3 June 2021   Published: 30 June 2021

Abstract

Micellar catalysis has been established for several decades although has recently been gaining attention as a method for enabling greener chemical synthesis. While the main reason underpinning the modern renaissance of micellar catalysis is the ability to perform reactions using water as a solvent, the use of micellar conditions influences reactivity in ways that do not occur in homogeneous solutions, owing to the confinement of reagents within the micelle and their interactions with micellar headgroups. Recently, it has been discovered that ionic liquids, low-melting salts, can form amphiphilic nanostructures with bicontinuous polar and non-polar domains. Here, we review the evidence to date of the influence of ionic liquid nanostructure on reactivity in comparison with the known influence of micellar catalysis to examine the relationship between these approaches to reactivity in structured media. Key benefits and limitations of each approach are highlighted, with areas likely to benefit from the development of a deeper understanding of reactivity in nanostructured ionic liquids identified.

Keywords: ionic liquids, micellar catalysis, kinetics, nanostructure, self-assembly, pseudophase, solvent effects, Stern layer.


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