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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 (1993). SOLUTION-STATE NMR-STUDIES OF POLYANILINE STRUCTURE. Synthetic Metals 55(1): 666-671.
  • Publication type: Journal Article
  • ISSN/ISBN: 0379-6779
  • Keywords: C-13 NMR

Author(s) from Durham

Abstract

We present the results of solution state NMR investigations of the
structure of polyaniline in various oxidation states. The resolution
obtained is much higher than that available from solid state
techniques. We confirm that the majority of the material present in
samples of leucoemeraldine base and emeraldine base have the previously
postulated structures, but find that defects in the postulated
structures may be present at concentrations up to 5 mole% of the repeat
units. The nature of the defects cannot be identified with certainty,
but some postulated defect structures can be excluded on the basis of
chemical shift calculations. End groups form part of the ''defect''
resonances, but do not account for all of them. We believe that the
considerable spectral complexity apparent in both the C-13 and N-15
spectra of emeraldine base reflect the large number of discrete
conformational states of the polymer chain.