Abstract
X-Ray photoelectron spectroscopy (XPS) studies have been performed on polypyrrole–2,3-dichloro-5,6-dicyano-p-benzoquinone (PPY–DDQ) and polypyrrole–tetrachloro-o-benzoquinone (PPY–chloranil) complexes prepared via the simultaneous chemical polymerization and oxidation of pyrrole by the respective acceptor. XPS data suggested that the charge transfer interactions in both complexes probably proceeded further than the pure formation of a molecular complex. The negative charges of both organic anions were mainly localized on the oxygen and the chlorine atoms and to some extent on the nitrogen of DDQ. More extensive charge transfer interaction and higher fraction of pyrrole nitrogen with positive charge were observed in the PPY–DDQ complex, which exhibited a substantially higher electrical conductivity than the corresponding PPY–chloranil complex.
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