Chapter 16 Electrically-Conducting Polymers

Abstract

High-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy provides useful information about the structures and dynamics of electrically-conducting polymers in solid state, which sometimes cannot be determined by X-ray diffraction. NMR chemical shifts are very sensitive to the structure in the solid state and the separable resonance lines lead to an exact structural analysis. Polypyrrole is a series of heterocyclic polymers that has attracted much attention because of its characteristic electric and electronic properties. The structure of polypyrrole in the solid state has been studied by means of high-resolution solid-state 13 C NMR spectroscopy. The structure of polypyrrole, prepared electrochemically, has been analyzed by using highresolution solid-state 15 N NMR spectroscopy. The sample used is 15 N-labeled to obtain 15 N spectra with a high signal-to-noise ratio. However, a successful analysis of the 15 N cross-polarization combined with magic-angle spinning (CP/MAS) spectra of the polymers could not be carried out in the solid state because of insufficient resolution. The structural analysis using high resolution solid-state NMR was successfully performed on other conducting polymers such as polyphenylene vinylene, polyaniline, polyphenylene sulphide, and poly- p -phenylene.