Thallium(III) trifluoroacetate-rifluoroacetic acid in the chemistry of polythiophenes. 2. Treatment of 3-alkylthiophenes and electron paramagnetic resonance resonance results

摘要

The treatment of thiophene and 3-alkylthiophenes with thallium(III) trifluoroacetate (TTFA) in trifluoroacetic acid (TFA) gives insoluble and dark powdery solids with oxygen content and electrical conductivities ranging from 10~4to 10~6Ω-1 cm~1. Polar and short fraction are negligible. All of them show semiconductivity (10~3-10~6Ω~1 cm~1) when doped in iodine atmosphere. Electron paramagnetic resonance (EPR) spectra of either as-synthesized or I_2-treated solids display characteristic single and broad lines (ΔH_pp, 1.84-7.4 G) with Lorentzian shapes and g-values in the range 2.0028-2.0038.