Simultaneous EPR (Electron Paramagnetic Resonance) Electrochemical Measurements on Polyfluorene in Ambient Temperature Ionic Liquids

摘要

Simultaneous electron paramagnetic resonance (EPR) and electrochemical measurements have been carried out in polyfluorene prepared by monomer oxidation and utilized in an ambient temperature ionic liquid consisting of 1-methyl-3-ethylimidazolium chloride-aluminum chloride. A considerable EPR signal is observed in both the reduced and oxidized states; the EPR signal achieves a maximum value coincident with the peak current during a cyclic voltammogram. Assuming that the process is two one-electron steps, initially forming a radical cation, the difference between the two E values is estimated as less than 70 m V. Keywords: Electroactive conducting polymers, Chloroaluminates, Electrochemistry. Reprints. (jes)