Vapor Pressure of Ionic Liquids with a Common Tetrabutylammonium Cation and Three Different Anions
Source abstract
Abstract
The vapor pressures, pv, of three ionic compounds used as starting materials of deep eutectic systems, namely, tetrabutylammonium bromide (TBA-Br), tetrabutylammonium trifluoromethanesulfonate (TBA-TFO), and tetrabutylammonium bis(trifluoromethanesulfonyl)imide (TBA-NTF2), were measured using isothermal thermogravimetry. TBA-Br displays large values of pv, reaching ≈700 Pa at 170 °C. TBA-NTF2 is the less volatile liquid, with a vapor pressure of ≈1 Pa at 240 °C, while TBA-TFO has a slightly higher value of pv, of about 3 Pa at the same temperature. The values of pv for the NTF2-containing ionic compound are comparable to those of ionic liquids containing the same anion. The obtained mean vaporization enthalpy, ΔHvap, for TBA-Br and TBA-TFO (≈170 kJ mol−1) is higher than for TBA-NTF2 (≈145 kJ mol−1). The obtained vaporization enthalpy values fall within the typical range observed for ionic liquids.
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Research context
OpenAlex topics: Ionic liquids properties and applications · Chemical Thermodynamics and Molecular Structure · Electrochemical Analysis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Dipartimento di Chimica, Sapienza Università di Roma, Piazzale A. Moro 5, 00185 Roma, Italy
Istituto Nazionale per la Scienza e Tecnologia dei Materiali, Via G. Giusti 9, 50121 Firenze, Italy
Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Piazzale A. Moro 5, 00185 Roma, Italy
Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale A. Moro 5, 00185 Roma, Italy
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