Influence of the Water Content on the Structure and Physicochemical Properties of an Ionic Liquid and Its Li⁺ Mixture

Abstract

The effect of water on the hydrophobic ionic liquid (IL) 1-n-butyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonylimide) and its Li(+) mixture was evaluated. The electrochemical stability, density, viscosity, and ionic conductivity were measured for both systems in different concentrations of water. The presence of Li(+) causes a large increase in the water absorption ability of the IL. The experimental results suggest a break of the interactions between Li(+) and Tf2N(-) anions in the strong aggregates formed in dried Li(+) mixtures, modifying the size and physicochemical nature of these aggregates. It is also observed that the size of the ions aggregates with formal charge increases at high temperature and decreases the mobility of the charge carrier, explaining the break in the Walden rules at high temperature. Raman spectroscopy and molecular dynamic simulations show the structural change of these systems. In neat ILs, the water molecules interact mainly among each other, while in the Li(+) mixtures, water interacts preferentially with the metallic cation, causing an important change in the aggregates present in this system.

Solvent extraction of Pt(IV), Pd(II), and Rh(III) with the ionic liquid trioctyl(dodecyl) phosphonium chloride

“…Our new ionic liquid P 88812 Cl featured lower water content than that of P 66614 Cl. Water molecules in ionic liquids can interact with the ionic liquid cations leading to their aggregation . Thus, the low water content of P 88812 Cl might prevent any decrease in extraction performance.…”

“…Water molecules in ionic liquids can interact with the ionic liquid cations leading to their aggregation. 21,22 Thus, the low water content of P 88812 Cl might prevent any decrease in extraction performance. P 88812 Cl also showed a lower degree of P release into the aqueous phase than that of P 66614 Cl, which indicates higher hydrophobicity of P 88812 Cl compared with that of P 66614 Cl.…”

One‐Pot Synthesis of Sulfur and Nitrogen Co‐Functionalized Graphene Material using Deep Eutectic Solvents for Supercapacitors

“…Alargercation will provide better nucleophilicity to associated anionsi ncomparison with as maller cation owing to the loose association between them. [39,40] The observed density of the DES was 1.14 gmL À1 .F urther,t he co-doping of Sa nd Na nd the reductionwere analyzed by different characterization techniques. After the reduction process, the yellow-brown GO turned into ad ark black mass, suggesting the temporary formationo f RGO.…”

“…[38] This was also correlated with KF titration at room temperature. [39,40] The observed density of the DES was 1.14 gmL À1 .F urther,t he co-doping of Sa nd Na nd the reductionwere analyzed by different characterization techniques. From the elemental analysis, we found 12.4 %Sand 4.9 %Nin the as-prepared SN-rGO material( Ta ble S1, Supporting Information).…”

Creation of Nonspherical Microparticles through Osmosis‐Driven Arrested Coalescence of Microfluidic Emulsions

“…The extraordinary solubility of salt (LiTf 2 N) in the IL (C 4 vim[Tf 2 N]) results from the unique physical chemistry properties and multiple molecular interactions of ILs . Different from conventional organic solvents, ILs are a class of molten salts consisting of organic cations and anions, exhibiting dual ionic and organic nature and excellent solvency for a broad range of substances .…”