Thermodynamic properties of tetrabutylammonium iodide and tetrabutylammonium tetraphenylborate

N. N. Smirnova*, L. Ya Tsvetkova, T. A. Bykova, V. A. Ruchenin, Yizhak Marcus

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 languageEnglish
Pages (from-to)15-20
Number of pages6
JournalThermochimica Acta
Volume483
Issue number1-2
DOIs
StatePublished - 10 Feb 2009

Keywords

  • Calorimetry
  • Fusion
  • Heat capacity
  • Tetrabutylammonium iodide
  • Tetrabutylammonium tetraphenylborate
  • Thermodynamic characteristics of fusion
  • Thermodynamic functions

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