Abstract
The heat capacities of crystalline tetrabutylammonium iodide (TBAI) and tetrabutylammonium tetraphenylborate (TBATPhB) were determined over the temperature range 5-350 K by adiabatic vacuum calorimetry, generally with an uncertainty of ±0.2%. The experimental data were used to calculate the standard thermodynamic functions of TBAI and TBATPhB, namely, the heat capacity C p°(T), enthalpy H°(T) - H°(0), entropy S°(T) and Gibbs function G°(T) - H°(0) at p° = 0.1 MPa for the range from T → 0 to T = 350 K. The standard entropy of formation ΔfS° TBAI and TBATPhB at T = 298.15 K was also determined. Thermodynamic characteristics of fusion and solid-state transition were determined by DSC, their comparison with literature data were carry out; numerical values of enthalpies and entropies of transitions were discussed in dependence of compounds composition.
Original language | English |
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Pages (from-to) | 15-20 |
Number of pages | 6 |
Journal | Thermochimica Acta |
Volume | 483 |
Issue number | 1-2 |
DOIs | |
State | Published - 10 Feb 2009 |
Keywords
- Calorimetry
- Fusion
- Heat capacity
- Tetrabutylammonium iodide
- Tetrabutylammonium tetraphenylborate
- Thermodynamic characteristics of fusion
- Thermodynamic functions