Abstract
Electrochemical properties of poly[(disilanylene)oligophenylenes], [(SiR 1R 2SiR 1R 2)(C 6H 4) m ] n (R 1=R 2=Me, R 1=R 2=Et, and R 1=Ph, R 2=Me; m=1–4) were investigated. The cyclic voltammograms (CVs) of the polymer films on indium–tin oxide (ITO) display irreversible oxidation peaks. Disilanylene–phenylene polymers ( m=1) were oxidized in one step, while polymers with longer oligophenylene groups ( m=2–4) underwent multi-step oxidation and the oxidation peaks shifted to lower potentials with the increase of the number of phenylene groups ( m) between disilanylene units. Poly[(dimethyldiphenyldisilanylene)phenylene] (R 1=Ph, R 2=Me; m=1) exhibited changes in UV spectrum and CV profile, presumably due to the conformation changes in the polymer chain, on annealing the film at 210°C. We also measured CVs of poly[(dimethylsilylene)biphenylene] and poly[(tetraethyldisiloxanylene)biphenylene] for comparison and found that the Si–Si orbital plays an important role in the first oxidation step of disilanylene–oligophenylene polymer films.
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