Abstract
Conducting polypyrrole-ferrous cyanide films or powders can be obtained by electrochemical or chemical oxidation of pyrrole in solutions containing ferrous and/or ferric cyanide anions. Mössbauer effect studies show that Fe(CN) 4− 6 is the only iron species detectable in electrochemically prepared polypyrrole films. Ferrous cyanide anion is also the dominant dopant in the samples synthesized chemically. Elemental analysis and IR studies confirm the presence of iron cyanide anions in the samples. The IR studies indicate the existence of defects in polypyrrole chains possibly consisting of C=N groupings in dehydrogenated pyrrole rings. Solid state 13C NMR spectra of chemically prepared polypyrrole-iron cyanide anions system exhibits a double peak structure: a broad peak centered at 126 ppm and a small peak at 104 ppm. The conductivity of polypyrrole-ferrous cyanides is lower than observed in other conducting polypyrrole-based systems and decreases approximately twice upon 30 day period of exposure to air.
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