Chemistry Reference
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intense and fruitful research in the field of
chemically modified electrodes. Functional
substances are immobilized on base electrodes
through covalent bonds like ester, ether and
amide with desired functional substances.
When noble metal electrodes like gold and
platinum are immersed in a solution of thiol or
disulfide for a while, the electrode surface is
readily modified with a self-assembled thiol
monolayer. Since various functional groups can
be immobilized on the electrode surface and the
method of modification is versatile, this method
is widely used. However, only a few examples of
its application to electrosynthesis are known
[50].
Pinson, Saveant and co-workers developed an
efficient and general procedure for covalent
bonding of aryl groups to an electrode by
cathodic reduction of an aryldiazonium ion. The
aryl radicals thus generated bind efficiently to
the electrode surface. The resulting modified
electrode is highly stable. Thus, various aryl
groups can be attached to carbon, silicon and
metal electrode surfaces by this procedure
[51a]. Such modified electrodes are widely
applicable, for instance in sensors and
electrocatalysts,
but
application
to
electrosynthesis has been limited so far [51b].
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