Tetrahydrothiophene-Based Ionic Liquids: Synthesis and Thermodynamic Characterizations.

ABSTRACT: S-alkyltetrahydrothiophenium, [C_n THT]⁺ bis(trifluorosulfonyl)imide, [NTf₂ ]^- room temperature ionic liquids (ILs) and tetraphenylborate, [BPh₄ ]^- salts with alkyl chain lengths from C₄ to C₁₀ have been prepared. The ILs and salts were characterized and their purity verified by ¹ H- and ¹³ C-nuclear magnetic resonance, elemental analysis, ion chromatography, Karl-Fischer titration, single crystal X-ray diffraction as well as thermogravimetric analysis. The experimentally determined density and viscosity decrease with increasing temperature. The experimental solubility of the [C_n THT][NTf₂ ]-ILs in water (75 to 2.2?mg/L for C₄ to C₁₀ ) was modelled with very good agreement by Perturbed Chain Statistical Associating Fluid Theory (PC-SAFT), based on the extremely low vapor pressures for the [C_n THT][NTf₂ ]-ILs measured in this work (4.15 to 0.037???10^-7 ×p_sat for C₄ to C₁₀ ). PC-SAFT is able to predict and correlate different thermodynamic properties by estimating the Helmholtz residual energy.

SUBMITTER: Schmitz A 

PROVIDER: S-EPMC7874261 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature