The enthalpy of formation of gaseous tetra-n-propylammonium cations Dedicated to the memory of the late Professor Manuel Ribeiro da Silva

Yizhak Marcus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The standard molar enthalpies of formation of crystalline tetraalkylammonium halides, ΔfH (R4NX, c), R = Me, Et, Pr, Bu and X = Cl, Br, I, and the corresponding lattice energies, U L(R4NX) were obtained from the literature as far as available for T = 298.15 K. From consistent values of these two quantities and values for ΔfH (X-, g) the standard molar enthalpies of formation of the gaseous cations were obtained from ΔfH (R4N+, g) = ΔfH (R4NX, c) + UL(R4NX) + 2RT - ΔfH (X-, g). The value for the hitherto unreported ΔfH (Pr4N +, g) = (307 ± 7) kJ · mol is here derived. The value for the absolute standard molar enthalpy of hydration ΔhH (R4N+, aq) is -210 kJ · mol-1, but may have an appreciable uncertainty, reflecting that of ΔfH (R 4N+, aq), obtained from interpolation of values for the Me, Et, and Bu analogues.

Original languageEnglish
Pages (from-to)196-199
Number of pages4
JournalJournal of Chemical Thermodynamics
Volume71
DOIs
StatePublished - Apr 2014

Keywords

  • Enthalpy of formation of crystalline salts
  • Enthalpy of formation of gaseous cation
  • Enthalpy of hydration
  • Lattice energy
  • Tetraalkylammonium cations

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