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Three new polymers, obtained by reacting thiophene or 3-alkylthiophenes as electron donors with aniline as acceptor in a donor–acceptor structure, were synthesized via oxidative polymerization using iron(III) chloride (FeCl3). The final products were characterized utilizing conventional techniques such as IR, NMR, UV–Vis spectrometry, which enabled demonstrating that an increase of the aliphatic chain...