Lithium and Potassium Ions Transfer Processes across the ITIES in The Presence of Crown Ethers

الملخص

The electrolytic cell with the electrolyte dropping electrode comprised Ag/AgCl as
working electrode, Ag/AgCl reference electrode and platinum wire counter electrode.
This cell evaluated by the determination of the thermodynamics data for lithium and
potassium ions transfer across a liquid-liquid interface in the presence of the crown
ethers. In the present system we intend to demonstrate the use of a simple threeelectrode
assembly with electrolyte dropping electrode for the study of the interfacial
ion transfer.
In particular, we focused on the transfer of lithium and potassium ions from water
to 1, 2- dichloroethane (1, 2-DCE) facilitated by complex formation with benzo-15-
crown -5 (B15C5), 18-crown -6 (18C6), dibenzo-18 – crown-6 (B218C6) and
dicyclohexyl-18- crown -6 (Cy2 18C6).
Extensive thermodynamics data, suggest that the standard
Gibbs energies of transfer of lithium and potassium ions from water to 1,2-DCE and
stability constant of crown ether complexes depends on the relative cation and ligand
cavity size, the number and special arrangements of the ligand binding sites and the
substitution on the macrocyclic ring.