Chemistry Reference
In-Depth Information
To further clarify the mechanism, we can carry
out the electrochemical reaction on a large
enough scale to permit the products and
intermediates to be isolated and identified. CV
measurements of the products and
intermediates isolated by preparative scale
electrolysis may also help us to understand the
mechanism of the studied electrochemical
reaction. Thus, both CV measurement and
preparative scale electrolysis are absolutely
essential to clarify the complex mechanism of
an unknown organic electrode reaction.
2.8.3 Voltammetry for Selection of
Mediator
Most organic electrode reactions are carried out
by direct electrolysis, that is, by electron
transfer between the organic substrate and the
electrode. On the other hand, by adding a redox
mediator to the medium it is possible to carry
out electrochemical reactions even at a
potential where the substance of interest is
electroinactive. In this system, as shown in
Figure 2.9 (this is for the oxidation process, but
exactly analogous behaviour can be observed
for the reduction process), electron interchange
between the mediator M Red (catalyst) and the
electrode generates a substance M Ox that can in
turn undergo an electron interchange with the
substrate molecule to give the product. This
kind of system is called a mediated
Search WWH ::




Custom Search