Thermodynamics of Protonation of Aqueous Triethylenediamine
Calorimetric determinations of heats of solution of solid triethylenediamine in water and in aqueous acid at 25°C. lead to the following: NR3NH+(aq) = H+(aq) + NR3N(aq) ΔH° = 7.21 kcal. per mole and +HNR3NH+(aq) = 2H+(aq) + NRN(aq) ΔH° = 10.18 kcal. per mole. Combination of these ΔH° values with ΔG° values from ionization constants leads to ΔS° = -15.2 and ΔS° = -18.8 cal. deg. -1 mole-1 for the two ionization reactions indicated above.
J. W. Larson et al., "Thermodynamics of Protonation of Aqueous Triethylenediamine," Journal of Chemical and Engineering Data, American Chemical Society (ACS), Jan 1966.
The definitive version is available at https://doi.org/10.1021/je60031a045
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© 1966 American Chemical Society (ACS), All rights reserved.