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Electrochemical polymerization and Optical Vibrations of Polyaniline Films

Salah Abdulla Hasoon

Polyaniline films were electrochemically synthesized of aniline in a two-electrode cell. It was observed that the doping influences the color of PANI thin films, which passes from blue to dark green color. Characterizations were made using FT-IR (Fourier transform spectroscopy) and a group theory analysis. A complete assignment of the fundamental infrared modes (400-4000 cm-1) of polymer is proposed. Experimental spectra were compared with that calculated by AM1, PM3, RM1, and MNDO. Results indicated that, for aniline, bianiline, and polyaniline, PM3 and RM1 calculated frequencies are in good agreement with experimental data. The geometry and vibrational calculations of four-ring unit (emeraldine base, EB) are believed to be a good representation of polyaniline.