G. Zotti, S. Zecchin, G. Schiavon
May 5, 2001
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0
Influential Citations
17
Citations
Journal
Macromolecules
Abstract
Anodic coupling of some (4H-cyclopentadithien-4-yl)alkylammonium perchlorates in acetonitrile + 0.1 M Bu 4 NClO 4 produces polycationic polythiophene films with high conjugation length (λ max = 590-600 nm; E° = -0.3 V vs Ag/Ag + ), conductivity (0.5-2 S cm 1 ), and solubility in organic solvents such as ethanol and acetonitrile. The 4-hexyl-substituted polymer is reversibly reduced (n-doped) at E° = -2.08 V. Electrochemical quartz crystal microbalance measurements of the ion flux during n-doping in acetonitrile have shown that anion ejection is dominant over cation injection, attaining 90-95% of the total ion flux. The kinetics of the n-doping process has been investigated by cyclic voltammetry in comparison with that of the analogous 4,4'-dihexyl-substituted polymer. In the latter cation injection is slower and shows a strong dependence on the cation size.