ITIES
ITIES is an acronym used in electrochemistry for the Interface between Two Immiscible Electrolyte Solutions. Usually, one electrolyte is an aqueous electrolyte composed of hydrophilic ions such as NaCl dissolved in water and the other electrolyte is a lipophilic salt such as tetrabutylammonium tetraphenylborate dissolved in an organic solvent immiscible with water such as nitrobenzene, 1,2-dichloroethane.
An ITIES is an electrochemical interface that is either polarisable or polarised. An ITIES is said polarisable if one can change the Galvani potential difference or in other words the difference of inner potentials between the two adjacent phases without changing noticeably the chemical composition of the respective phases, i.e. without noticeable electrochemical reactions taking place at the interface. An ITIES system is said polarised if the distribution of the different charges and redox species between the two phases determined the Galvani potential difference.
Charge transfer reactions at ITIES
Three major classes of charge transfer reactions can be studied at ITIES.
Ion transfer reactions.
Assisted ion transfer reactions.
Heterogeneous electron transfer reactions.
The Nernst equation for ion transfer reaction reads
where File:Formule2.jpg is the standard transfer potential defined as the Gibbs energy of transfer expressed in a voltage scale.
File:Formule3.jpg

The Nernst equation for heterogeneous electron transfer reactions reads
where File:Formule5.jpg is the standard redox potential for the interfacial transfer of electrons defined as the difference the standard redox potentials of the two redox couples but referred the aqueous Standard Hydrogen Electrode (SHE).
