| Autor: |
Markin AV; Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, Gagarin Avenue 23, 603022 Nizhny Novgorod, Russia., Ciccioli A; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Lapi A; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy.; Institute for Biological Systems, Italian National Research Council (ISB-CNR), Secondary Office of Rome-Reaction Mechanisms c/o Department of Chemistry, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy., Sologubov SS; Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, Gagarin Avenue 23, 603022 Nizhny Novgorod, Russia., Smirnova NN; Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, Gagarin Avenue 23, 603022 Nizhny Novgorod, Russia., Vecchio Ciprioti S; Department of Basic and Applied Science for Engineering (S.B.A.I.), Sapienza University of Rome, Via del Castro Laurenziano 7, 00161 Rome, Italy. |
| Abstrakt: |
The molar heat capacity of 1,4-bis(3-methylimidazolium-1-yl)butane bis(trifluoromethylsulfonyl)imide dicationic ionic compound ([C 4 (MIm) 2 ][NTf 2 ] 2 ) has been studied over the temperature range from 6 to 350 K by adiabatic calorimetry. In the above temperature interval, this compound has been found to form crystal, liquid, and supercooled liquid. For [C 4 (MIm) 2 ][NTf 2 ] 2 , the temperature of fusion T ° fus = (337.88 ± 0.01) K has been determined by the fractional melting experiments, the enthalpy of fusion Δ fus H ° = (52.79 ± 0.28) kJ mol -1 has been measured using the calorimetric method of continuous energy input, and the entropy of fusion Δ fus S ° = (156.2 ± 1.7) J K -1 mol -1 has also been evaluated. The standard thermodynamic functions of the studied dicationic ionic compound, namely, the heat capacity C p °( T ), the enthalpy [ H °( T ) - H °(0)], the entropy S °( T ) and the Gibbs free energy [ G °( T ) - H °(0)] have been calculated on the basis of the experimental data for the temperature range up to 350 K. The results have been discussed and compared with those available in the literature and in the NIST Ionic Liquids Database (ILThermo) for monocationic ionic compounds. |
