Scholz, Fritz and Gulaboski, Rubin (2005) Gibbs energies of transfer of chiral anions across the interface water|chiral organic solvent determined with the help of three-phase electrodes. Faraday Discussions, 129. p. 169. ISSN 1359-6640
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Abstract
For the first time the differences in free energies have been experimentally determined for
the solvation of two enantiomeric ions in two enantiomeric solvents. Three-phase
electrodes consisting of a droplet of a solution of decamethylferrocene in a chiral solvent
(D- and L-2-octanol) attached to a graphite electrode and immersed in an aqueous solution
containing chiral anions, allow the measurement of these data for the transfer of the
enantiomeric ions across the water|chiral solvent interface. In all studied combinations the
Gibbs energy to transfer an L-ion from water to the L-solvent was equal to the Gibbs
energy of transfer of the D-ion from water to the D-solvent, and the same was found for
the transfer of a L-ion from water to the D-solvent and for the D-ion from water to the
L-solvent. In all cases, the combinations D-anion/D-solvent and L-anion/L-solvent have
smaller standard Gibbs energies than the combinations D-anion/L-solvent and L-anion/
D-solvent. This can be explained by less favourable interactions between an anion and a
solvent molecule in the latter cases.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ion transfer, chiral ions, voltammetry, liquid-liquid interface, biomimetic membranes, lipophilicitym standard Gibbs energy of ion transfer |
| Subjects: | Natural sciences > Chemical sciences |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Rubin Gulaboski |
| Date Deposited: | 31 Oct 2012 13:10 |
| Last Modified: | 31 Oct 2012 13:10 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/141 |
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