Synthesis, NMR, vibrational spectroscopy, thermal and DFT studies of new DABCO hexafluorophosphate based ionic liquid

Haddad, Boumediene; Brandán, Silvia Antonia; Fetouhi, Bekhaled; Boumediene, Mostefa; Paolone, A.; Villemin, Didier; Rahmouni, Mustapha; Bresson, Serge

doi:10.1016/j.molstruc.2022.132682

Cited by 7 publications

(1 citation statement)

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“…The thermal stability of all ionic liquids with 12 to 20 carbon atoms in the alkyl chain was similar and a 1% mass loss was observed around 340 °C [ 45 ], a value in close agreement with that here reported for [DABCO10][NTf 2 ]. [DABCO8][PF 6 ], instead, displayed a reduced thermal stability, as it started to decompose around 271 °C [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

Thermal Decomposition, Low Temperature Phase Transitions and Vapor Pressure of Less Common Ionic Liquids Based on the Bis(trifuoromethanesulfonyl)imide Anion

et al. 2022

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Four ionic liquids (ILs) based on the bis(trifluoromethanesulfonyl)imide (NTf2) anion were synthesized and characterized concerning their thermal stability, the occurrence of low temperature phase transitions and their volatility. All these physical quantities are highly important for possible applications. Both monocationic and dicationic ILs were considered. All ILs exhibit thermal stability exceeding 350 °C, an extremely high value, due to the presence of the NTf2 anion. Monocationic ILs can undergo crystallization, and they melt at 1 and 38 °C. On the contrary, dicationic ILs containing large positively charged ions display only a glass transition around −40 °C, without any crystallization or melting process; this fact is particularly important in view of the possibly low temperature applications of the dication ILs. The vapor pressure, pv, of the four ILs was measured by isothermal thermogravimetry in the temperature range between 250 and 325 °C; the lowest values of pv were obtained for the two dicationic liquids, suggesting that they are particularly well suited for high temperature applications. The vaporization enthalpy was calculated through the Clausius–Clapeyron equation and was found in the range between ~140 and ~180 kJ/mol depending on the specific IL.

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Section: Resultsmentioning

confidence: 99%