An evaluation of anion suitability for use in ionic liquids with long-term, high-temperature thermal stability

Abstract

The stability of fourteen different PPN+ salts has been studied in 96 hour tests, in air, at temperatures of 200 °C, 250 °C, and 300 °C.

Understanding liquid–liquid equilibria in binary mixtures of hydrocarbons with a thermally robust perarylphosphonium-based ionic liquid

“…[38][39][40] While many of these ILs do not melt below 100 C, these mesothermal ILs have shown a lot of promise as heat transfer uids, lubricants, solvents, and catalysts for high temperature reactions. 41 Despite the connement to thermally stable groups, innovative ways have been developed to expand this design space [42][43][44] and even tune the melting point. 45 This work focuses on triphenyl-p-phenoxyphenylphosphonium bis-triimide, shown in Fig.…”

Ionic liquids of superior thermal stability. Validation of PPh4+ as an organic cation of impressive thermodynamic durability

“…Since 2013 we have sought to design, prepare, and study ionic liquids that have degrees of thermal stability superior to those exhibited by commonplace imidazolium, quaternary ammonium, and tetraalkylphosphonium-type ILs. [1][2][3][4][5][6][7][8] And, while high thermal stability is important to ILs slated to be used as solvents in synthetic applications, 9 their development is especially important to their practical utility as additives to highperformance polymers, advanced lubricants, and as liquid-or 'liquiable' materials for energy-related uses such as energy storage via phase change and heat transfer uids in solar thermal arrays. 10 We note that the latter applications are those in which we especially envision future practical roles for the present class of ILs.…”

“…Our decision to employ it was driven by the established nature of its high intrinsic thermal stability, and its demonstrated lack of reactivity (versus several other ions) towards tetraarylphosphonium cations. 2,4 As in all our prior work, these were prepared using a modication of a synthetic methodology used by Charette and co-workers. 18 In brief, this consists of the dissolution of equimolar amounts of triphenylphosphine and an appropriately substituted aryl bromide, chloride, or iodide in ethylene glycol, to which has been added ca.…”

Extension of TEAM Force-Field Database to Ionic Liquids

“…For example, pyridinium has the advantage of low cost and high thermal stability; pyrrolidinium, piperidinium, and tetraalkylammonium exhibit high electrochemical stability; − phosphonium and ammonium share similar structure but different viscosity; , and triazolium has a low melting point . The selection of anions is more diversified, providing variations in thermal stability, hydrolytic stability, toxicity, and adsorption capacity . The abundant combinations of cations and anions, coupled to chemical modifications, gives rise to the great potential of manipulating the physical properties of ILs.…”