High quality poly(9,9-dioctylfluorene) films were synthesized electrochemically by direct oxidation of 9,9-dioctylfluorene in pure boron trifluoride diethyl etherate on stainless steel sheet, with polymer conductivity of 1×10^－2 S/cm. The initiate oxidation onset of 9,9-dioctylfluorene in such medium was only 1.25 V vs. SCE, which was much lower than that determined in 0.1 mol/L Bu₄NBF₄ acetonitrile solution (1.52 V vs. SCE). Polymer obtained from this medium showed good electrochemical behavior and can be partly dissolved in chloroform, tetrahydrofuran, dimethylsulfoxide, etc. FTIR and ¹H NMR spectral investigations indicated that the polymerization of monomer occurred mainly at 2,7 positions, and fluorescent spectral studies indicated that the polymer was a blue-light emitter.

Key words: conducting polymer, polyfluorenes, electrochemical polymerization, boron trifluoride diethyl etherate