Properties of Dicationic Disiloxane Ionic Liquids

Abstract

A number of dicationic ionic liquids with a disiloxane linker between imidazolium cations and bis(trifluoromethylsulfonyl)imide anion were synthesized and characterized. Melting points, viscosity, and volatility in a vacuum were measured; the thermal and hydrolytic stability of ionic liquids were also studied. The dependence of the properties on the structure of substituents in the cation of the ionic liquid was demonstrated.

Thermal Stability of Ionic Liquids: Current Status and Prospects for Future Development

“…Therefore, the thermal stability of DILs can be tuned by branching linkage chains [69]. Recently, DILs with m-xylyl, pyridine functional groups, and dioxane linkage chain have been synthesized, and all of them have a low melting point and high thermal stability [140][141][142]. Similar to monocationic ILs, anions have a major influence in the thermal stability of DILs, and Table 15 reveals that the thermal stability order is as follows: [129,141].…”

Preparation of Polyoxometalate-Based Composite by Solidification of Highly Active Cobalt-Containing Polytungstate on Polymeric Ionic Liquid for the Efficient Isolation of Proteinase K

“…Their structures are greatly affected by ambient pH conditions. There are three different lacunary anions in Keggin POMs, namely, [XM 11 O 39 ] n− , [XM 10 O 36 ] n− , and [XM 9 O 34 ] n− , which have been shown to possess the advantages of high coordination activity, catalytic activity, and structural flexibility [4]. At the same time, the negative charge localization caused by the lacunary structure results in Keggin POMs with high nucleophilicity, allowing them to easily coordinate with transition-metal ions, organometallic ions, rare-earth elements, etc.…”

“…Ionic liquids (ILs) are organic salts with a melting point below 100 • C [10]. An almost unlimited number of cations and anions may combine to form ILs with an equal number of anions and cations [11]; thus, ILs appear electrically neutral at room temperature. Possessing excellent characteristics such as good thermal stability, low volatility, low toxicity, high ionic conductivity, and an adjustable electrochemical structure, ILs are known as structurally adjustable green solvents and have been widely used in various scientific research fields [12].…”