Abstract
X-Ray photoelectron spectroscopy (XPS) studied have been performed on conductive polypyrrole (PPY)–halogen complexes, such as PPY–I2, PPY–Br2, and PPY–Cl2 complexes, prepared by the simultaneous chemical polymerization and oxidation of pyrrole by the respective halogens. Substantial halogenation of the pyrrole ring was observed in the case of PPY–Cl2 and PPY–Br2 complexes. In the case of PPY–Br2 complex, the ratio of covalent to ionic bromide content can be effectively varied over a wide range by varying the bromine to monomer ratio used for polymerization. The increase in covalent bromide content causes a decrease in the electrical conductivity of the complex. The N1s spectra suggest the presence of positively charged nitrogen species and their possible contribution to the electrical conductivity of the complexes. The C1s spectra for all the complexes reveal that close to 1/3 of the carbon atoms may have been associated with structural disorder, as in the case of electrochemically prepared PPYs.
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Kang, E., Ti, H., Neoh, K. et al. ESCA Analysis of Polymer–Acceptor Interactions in Chemically Synthesized Polypyrrole–Halogen Complexes. Polym J 20, 399–406 (1988). https://doi.org/10.1295/polymj.20.399
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DOI: https://doi.org/10.1295/polymj.20.399
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