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New poly(p-substituted-N-phenylpyrrole)s. Electrosynthesis, electrochemical properties and characterization.

Poly(N-p-hydroxyphenylpyrrole) [poly(HOPhPy)], poly(N-p-methoxyphenylpyrrole) [poly(MeOPhPy)], poly(N-p-thiophene-phenylpyrrole) [poly(ThPhPy)], poly(1,1-phenylene dipyrridyl) [poly(PhDPy)] and poly(1,1-diphenylene dipyrridyl) [poly(DPhDPy)] were electrosynthesized from the corresponding monomers on Pt electrode in 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF6) acetonitrile solutions, using cyclic voltammetry (CV), galvanostatic and potentiostatic modes. The electrodeposited films were characterized by CV, FT-IR spectrometry, X-ray photoelectron spectra (XPS), and scanning electron microscopy (SEM). Electron-donating substituent effects on the polymer electrochemical properties were investigated by CV. The CV of the films indicated a good redox behaviour and a peak position depending on the nature of substituent. FT-IR spectral studies allowed one to predict a linear and regular structure of the polymer chains, the coupling taking place in the 2 and 5 positions of the pyrrole rings. XPS analysis showed a variation of the film doping levels (26–42% for oxidized films and 6–12% for reduced films) with the electron-donor character of the phenyl p-substituents. The conjugated -electronic system was extended by strong electron-donating substituents which led to a higher doping level of the polypyrrolic chains and a polymer structure with high-energy and polar bonds like C N+ and C N+. SEM analysis revealed changes in the polymer film morphology and thickness with the nature of substituents

Auteur(s) : A.K.D. Diaw, D. Gningue-Sall, A. Yassar, J.J. Aaron
Pages : 74–85
Année de publication : 2013
Revue : Synthetic Metals
N° de volume : 179
Type : Article
Statut Editorial : Elsevier B.V
Mise en ligne par : DIAW Abdou Karim Diagne