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In this work, poly (3-methylthiophene) (P3MT) and poly (3-octylthiophene)  (P3OT) films were synthesized electrochemically in non-aqueous media through  the oxidation of the monomers, (3-methylthiophene and 3-octylthiophene),  using a standard three-electrode cell in acetonitrile with 0.100 mol L-1  LiClO4. The polymeric thin films were deposited on platinum plates for  optimal quality control of the process. It was observed that the material  as-prepared for the anodic electropolymerization undergoes a natural process  of de-protonation as a function of time. Moreover, the partial dedoped form,  obtained in NH4OH solution, presents a good chemically stabilite form but,  when radiated with blue light again becomes unstable. Films obtained by these  methods have been characterized by cyclic voltammetry, Raman and  photoluminescence spectroscopy. Both Raman and photoluminescence (PL) spectra  results led to the characterization of two structures (pristine and  non-pristine forms of thiophene rings) which formed the P3MT and P3OT polymer  chain. These results were associated with the stabilization of pristine  chains and mixed chains (non-pristine structures), radical cation and  dication forms, in the polymeric film. Their bands in the Raman and PL  spectra are wide and asymmetric and their adjustments by Gaussian functions  were necessary, indicating that there are three distinct contributions to the  vibration and two to the emission spectra in the formed polymeric material

Spectroscopic analysis of the structure and stability of two electrochemically synthesized poly(3-alkylthiophene)s