The enthalpy of formation of gaseous tetra-n-propylammonium cations

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