Analytical Sciences

Abstract − Analytical Sciences, 34(8), 919 (2018).

Prediction of the Standard Gibbs Energy of Ion Transfer across the 1,2-Dichloroethane/Water Interface
Akiyoshi YAMADA, Erina YOSHIDA, Kazuo EDA, and Toshiyuki OSAKAI
Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe 657-8501, Japan
The standard Gibbs energy of ion transfer at the 1,2-dichloroethane/water interface (ΔGtr°,W→O) was determined for 26 organic cations and 24 anions by means of ion-transfer voltammetry with a micro oil/water interface. Based on the data sets, a theoretical analysis was performed with the non-Bornian solvation model, in which the solvation energy of an organic ion is evaluated from local electric fields on the surface of the ion. The semi-empirical equations thus obtained are available for relatively accurate prediction of ΔGtr°,W→O for organic ions. The mean absolute error was 1.9 or 3.1 kJ mol−1 for cations or anions, respectively, corresponding to the error of ∼20 or ∼30 mV in the standard ion-transfer potential. In this paper, energy decomposition has been performed to discuss different contributions to ΔGtr°,W→O from the “hydrated” (strongly charged) and positively and negatively charged “non-hydrated” (moderately charged) surfaces as well as from the hydrophobic interaction (cavity formation energy).