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Structural characterization of conducting polypyrrole using 13C cross-polarization/magic-angle spinning solid-state nuclear magnetic resonance spectroscopy
journal contribution
posted on 1994-04-01, 00:00 authored by Maria ForsythMaria Forsyth, V T Truong, M Smith13C nuclear magnetic resonance (n.m.r.) has been used to study polypyrrole and N-substituted polypyrrole in the solid state. The extent of oxidation appears to be counterion-dependent; in particular, the quinoid structure appears favoured in the films prepared with dodecyl sulfate. Resonances associated with the quinoid unit are lost upon reduction of the polypyrrole film, which supports the idea that the quinoid structure is associated with the oxidized form of polypyrrole. N-substituted polypyrroles have a more distinct resonance at 110 ppm, which is linked to lower degrees of oxidation or charge delocalization in these systems. The decrease in conductivity of polypyrrole upon thermal ageing in air is associated with both the loss of counterion (‘thermal dedoping’) and the decomposition of the quinoid structure in the polymer backbone. There is no indication of carbonyl formation in the solid-state n.m.r. spectra obtained in the present study.
History
Journal
PolymerVolume
35Issue
8Pagination
1593 - 1601Publisher
Elsevier Ltd.Location
Oxford, EnglandPublisher DOI
ISSN
0032-3861eISSN
1873-2291Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1994, Butterworth-Heinemann Ltd.Usage metrics
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