Novel organic solvents for electrochemistry at the liquid/liquid interface

Area of Science:

• Electrochemistry
• Physical Chemistry
• Analytical Chemistry

Background:

• Liquid-liquid interfaces are crucial in various chemical and biological systems.
• Understanding ion and electron transfer across these interfaces is key for electrochemical applications.

Purpose of the Study:

• To investigate ion transfer across liquid/liquid interfaces using two-phase voltammetry.
• To determine the standard Gibbs energies of ion partition.
• To study ion transfer and electron transfer at the 5-nonanone/water interface.

Main Methods:

• Two-phase voltammetry in a reverse cell configuration.
• Utilizing organic solvents with nitrile or ketone functional groups.
• Observation of ion transfer for tetraphenylarsonium (TPAs+), tetrabutylammonium (TBA+), tetrapropylammonium (TPrA+), and perchlorate (ClO4-) ions.
• Investigation of electron transfer using ferri/ferrocyanide and 7,7,8,8-tetracyanoquinodimethane (TCNQ).

Main Results:

• Observed ion transfer across interfaces with nitrile and ketone-containing organic solvents.
• Calculated standard Gibbs energies of ion partition from water to di-n-butyl ketone (5-nonanone).
• Compared partition energies with the 2-heptanone/water interface.
• Investigated ion transfer (IT) and electron transfer (ET) at the 5-nonanone/water interface.

Conclusions:

• The study successfully demonstrated ion transfer and electron transfer across specific liquid/liquid interfaces.
• Quantified Gibbs energies provide valuable thermodynamic data for ion partitioning.
• Findings contribute to the understanding of electrochemical behavior at interfaces.