THE CHEMICAL AND PHYSICAL-PROPERTIES OF ELECTROCHEMICALLY PREPARED POLYINDOLE HEXAFLUOROPHOSPHATE (PIPF6)

Polyindole hexafluorophosphate (PIPF6) was prepared by electrooxidation supplying a potential of 0.7 V. The cyclic voltammetry suggested that the electrode reaction was irreversible, and the electropolymerization of indole formed radical cations. Thermogravimetric analyses of the polyindole-based systems were performed at a temperature range of 25 approximately 800-degrees-C under a nitrogen atmosphere. From the TGA results, we concluded that most polyindole systems mainly decomposed at higher temperatures than the polyaniline-based ones. The maximum thermal decomposition rate (R(max)) for polyindole systems was unaffected by the kind of electron acceptors, but the values of the polyaniline-based materials were affected by dopants. The electrical conductivity of the PIPF6 was measured in a temperature range from -150 to 25-degrees-C. The values of log-sigma at 25-degrees-C and of E(a) as calculated from an Arrhenius plot were -4.15 S/cm and 0.64 eV, respectively. Our conductivity measurements suggest that a possible conduction mechanism for the PIPF6 pellet is the hopping conduction, and that the charge carriers are polarons. The ESR analysis of the PIPF6 powder was performed at 25-degrees-C, and, thus, parameters of DELTA-H(pp), g-value and spectra ratio were obtained.