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

Journal Article · Wed Mar 14 04:00:00 EST 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00162a065· OSTI ID:6378639

Andrieux, C P; Audebert, P; Hapiot, P; Saveant, J ^[1]

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1. Universite de Paris (France)

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.

• OSTI ID: 6378639
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:6; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
AZOLES
CHEMISTRY
DATA
DATA ANALYSIS
ELECTROCHEMISTRY
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRROLES
RADICALS
REACTIVITY
VOLTAMETRY