Ac Conductivity of Pyrene Iodine Charge Transfer Complex

抄録

Electrical conduction of a charge transfer complex between pyrene and iodine is studied by ac method. Frequencies used are from 1.0×10³ to 2.4×10¹⁰ Hz at the temperature region from 80°K to 330°K. The conductivity of the complex is expressed as σ=σ_d+σ_ω; σ_d is independent of frequency, σ_ω dependent on frequency. Above 250°K, σ_d predominates and below 150°K, σ_ω predominates in σ in the frequency region of the measurement. It is suggested that σ_d is due to the unpaired electrons in conduction state since the activation energy of conductivity and that of spin density are the same value of 0.14 eV and the conductivity shows no frequency dispersion at the higher temperatures. σ_ω is due to the localized unpaired electrons surrounded by a potential barrier of 0.07 eV and it is explained by an equation based on a simplified hopping model.