Structural Characterization of Conducting Polypyrrole Using C-13Cross-Polarization Magic-Angel-Spining Solid-State Nuclear-Magnetic-Resonance Spectroscopy

Forsyth, M. and Truong, V.T and Smith, M.E (1994) Structural Characterization of Conducting Polypyrrole Using C-13Cross-Polarization Magic-Angel-Spining Solid-State Nuclear-Magnetic-Resonance Spectroscopy. Polymer, 35 (8). pp. 1593-1601. ISSN 0032-3861. (The full text of this publication is not available from this repository)

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Abstract

C-13 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.

Item Type: Article
Uncontrolled keywords: CONDUCTING POLYPYRROLE; C-13 CP-MAS NMR; STRUCTURAL CHARACTERIZATION
Subjects: Q Science > Q Science (General)
Divisions: Faculties > Science Technology and Medical Studies > Centre for Music Technology
Depositing User: P. Ogbuji
Date Deposited: 29 Jun 2009 20:26
Last Modified: 29 Jun 2009 20:26
Resource URI: http://kar.kent.ac.uk/id/eprint/20190 (The current URI for this page, for reference purposes)
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