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Electrocatalytic Deposition of Polypyrrole
Author(s) -
Oberst Manfred,
Beck Fritz
Publication year - 1987
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198710311
Subject(s) - polypyrrole , pyrrole , chemistry , bromine , bromide , deposition (geology) , polymer , polymer chemistry , molecule , photochemistry , inorganic chemistry , catalysis , radical ion , ion , organic chemistry , polymerization , paleontology , sediment , biology
In the presence of a small amount of bromide , the deposition of polypyrrole is possible at appreciably higher current densities than in the absence of a catalyst. The mechanism is assumed to involve the reaction of pyrrole with bromine in the form of Br 3 to give [Br 3 ] ⊖ and the pyrrole radical cation. The latter then undergoes addition at the 2 position with a second radical cation or with a neutral pyrrole molecule, a CC bond being formed. The dimers are readily oxidized further, resulting in the formation of polymers. The [Br 3 ] ⊖ ion is reoxidized at the electrode.