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A study of acid/base treatments of polypyrrole films using 13C n.m.r. spectroscopy

Forsyth, M. and Truong, V. -T. 1995, A study of acid/base treatments of polypyrrole films using 13C n.m.r. spectroscopy, Polymer, vol. 36, no. 4, pp. 725-730.

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Title A study of acid/base treatments of polypyrrole films using 13C n.m.r. spectroscopy
Formatted title A study of acid/base treatments of polypyrrole films using 13C n.m.r. spectroscopy
Author(s) Forsyth, M.
Truong, V. -T.
Journal name Polymer
Volume number 36
Issue number 4
Start page 725
End page 730
Publisher Elsevier Ltd.
Place of publication Oxford, England
Publication date 1995
ISSN 0032-3861
1873-2291
Keyword(s) polypyrrole films
n.m.r. spectroscopy
acid/base treatment
Summary Electrodeposited polypyrrole films prepared with paratoluenesulfonate (pTS), dodecylsulfate (DDS) and perchlorate anions were treated with acidic and basic solutions, and their structure was investigated by 13C solid state n.m.r. spectroscopy. This technique has confirmed that pTS is completely removed from the film in both acidic and basic solutions whilst DDS is only partially removed and tends to decompose upon treatment with H2SO4. The appearance of shoulders at 143 ppm upon treatment with 0.5 M base indicates formation of a quinoid pyrrole structure. Substitution on the β-carbon by OH cannot be confirmed from the present spectra. Stronger base causes a more dramatic change in the polypyrrole backbone with an obvious increase in the electron density on the β-carbons, consistent with the reduction of the carbon backbone. There is no indication of quinoid units in this case. Acid treatments result in considerable broadening of the main 127 ppm polypyrrole peak.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1995, Elsevier Science Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030148

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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