Observation of the cation radicals of pyrrole and of some substituted pyrroles in fast-scan cyclic voltammetry. Standard potentials and lifetimes

Polypyrroles and polysubstituted pyrroles have attracted considerable and increasing attention over the past 10 years in view of their remarkable conducting and electrocatalytic properties. Oxidative electropolymerization of pyrrolic monomers is a convenient and attractive route to polypyrrole elect...

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Bibliographic Details
Published in:Journal of the American Chemical Society 1990-03, Vol.112 (6), p.2439-2440
Main Authors: Andrieux, Claude P, Audebert, Pierre, Hapiot, Phillipe, Saveant, Jean Michel
Format: Article
Language:English
Subjects:
400400 - Electrochemistry
Adsorption
AZOLES
CHEMISTRY
DATA
DATA ANALYSIS
ELECTROCHEMISTRY
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
HETEROCYCLIC COMPOUNDS
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRROLES
RADICALS
REACTIVITY
Study of interfaces
VOLTAMETRY
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Summary:Polypyrroles and polysubstituted pyrroles have attracted considerable and increasing attention over the past 10 years in view of their remarkable conducting and electrocatalytic properties. Oxidative electropolymerization of pyrrolic monomers is a convenient and attractive route to polypyrrole electrode coatings and free-standing films. Although valuable information has been gained about the nucleation processes following the initial generation of dimeric and polymeric species, the mechanism by which these dimers are formed has not been ascertained. Likewise, the standard potentials at which the cation radicals are formed as well as their lifetimes are not known. The reason for this lack of information concerning the reactivity of the electrochemically generated pyrrole cation radical is that the measurement times employed in the experimental studies carried out by potential-step and cyclic voltammetric techniques were too long to allow the observation of the cation radical by means of its rereduction current. In the present preliminary report, they show that it is possible to overcome these difficulties by use of recently developed ultramicroelectrode techniques and thus to observe the pyrrolic cation radicals through their rereduction wave in fast-scan cyclic voltammetry.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja00162a065