Crystal structure of protic ionic liquids and their hydrates
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Date
2021-08-14
Journal Title
Journal ISSN
Volume Title
Publisher
International Union of Crystallography
Abstract
Protic Ionic Liquids (PILs) are a class of tailorable solvents made up of fused salts with melting points below 100 °C, which are formed through a Brønsted acid-base reaction involving proton exchange[1]. These solvents have applications as lubricants, electrolytes, and many other uses[2]. Although they are quite similar to molten salts, their crystal structures have not been explored in-depth, with only ethylammonium nitrate (EAN) having a reported crystal structure[3, 4]. Ten alkylammonium-based protic ionic liquids at both neat (<1 wt% water) and 90 mol% PIL, 10 mol% water concentrations were selected. Diffraction patterns were collected at the Australian Synchrotron ANSTO while attempting to crystallise the samples by cooling to 120 K. Five samples crystallised (3 neat, 2 dilute), where the temperature of the system was then increased at a rate of 6 K/min to room temperature. From these patterns we have identified a number of crystal phases, identifying their stability ranges and lattice constant variation from 120 K to room temperature. © 2021 The Authors
Description
Keywords
Crystal structure, Molten salts, Temperature range, Broensted acids, Protons, Solvents, Liquids, Hydrates, Diffraction, ANSTO, Crystallization
Citation
Hassett, M. P., Brand, H., Binns, J., Martin, A. V., & Greaves, T. L. (2021). Crystal structure of protic ionic liquids and their hydrates. Poster presented to the IUCr 2021, 25th Congress of the International Union of Crystallography, Prague, Czech Republic, 14-22 August 2021. In Acta Crystallographica Section A: Foundations and Advances, 77(a2), C1242. https://doi.org/doi:10.1107/S0108767321084701