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Durham University

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Publication details for Professor Andy Monkman

KENWRIGHT, AM, FEAST, WJ, ADAMS, P, MILTON, AJ, MONKMAN, AP & SAY, BJ (1992). SOLUTION-STATE C-13 NUCLEAR-MAGNETIC-RESONANCE STUDIES OF POLYANILINE. Polymer 33(20): 4292-4298.
  • Publication type: Journal Article
  • ISSN/ISBN: 0032-3861
  • Keywords: CONDUCTING POLYMERS; POLYANILINE; C-13 NUCLEAR MAGNETIC RESONANCE; CONFORMATIONSC-13 NMR; SPECTRA; POLYMERS

Author(s) from Durham

Abstract

Solution-state C-13 nuclear magnetic resonance spectra are presented
for the emeraldine base and leucoemeraldine base forms of polyaniline.
The bulk of the leucoemeraldine base sample gives a simple two-line
spectrum, which is readily assignable. The emeraldine base samples give
spectra of much greater complexity, showing many more lines than there
are carbons in the postulated chain repeat unit. This is rationalized
in terms of slow interchange of the many conformers available to the
emeraldine base form. A quantitative 'region assignment' is made. Gel
permeation chromatography measurements show that interconversion
between the two forms is achieved without either significant
crosslinking or chain scission. The minor peaks in the spectrum of the
leucoemeraldine base form due to chain defects (including chain ends)
are compared with chemical shift values calculated for postulated
structures, and some structures can be rejected on the basis of this.