The impact of oligomeric anions on the speciation of protic ionic liquids
authors Martins, MAR; Carvalho, PJ; Santos, LMNBF; Pinho, SP; Coutinho, JAP
nationality International
author keywords Protic Ionic Liquids; Carboxylates; Oligomeric anions; Acid:base; Ionicity
abstract The synthesis of protic ionic liquids based in carboxylate anions, too often admitted as being straightforward, is actually challenging and must be carefully addressed. This review discusses the importance of oligomeric anions, in particular those based on carboxylates, in the behavior and nature of protic ionic liquids. There is strong evidence in the literature that the synthesis, and subsequent purification, of protic ionic liquids involving carboxylic acids, leads to structures in the liquid phase with an acid:base proportion different from the expected 1:1 stoichiometry. The formation of the oligomeric anions, mostly dependent on the proton transfer from the Bronsted acid to the Bronsted base, may lead to a higher ionicity that suggests the formation of true ionic liquids. It is here stressed the relevance of deepening the understanding of the interactions between the species and the speciation of the liquid phase, combining experimental and theoretical approaches to establish foundations for insightful advances in the area. (C) 2020 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0378-3812
isbn 1879-0224
year published 2021
volume 531
digital object identifier (doi) 10.1016/j.fluid.2020.112919
web of science category 6
subject category Thermodynamics; Chemistry, Physical; Engineering, Chemical
unique article identifier WOS:000608006500009
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journal impact factor 2.838
5 year journal impact factor 2.454
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