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Oxidative electrochemical polymerization of pyrrole has been shown to occur in the 1:1 mole ratio AlCl3:N-(l-butyl)pyridinium chloride((BuPyCl) molten salt at 40 C. Polypyrrole cannot be prepared in analogous 0.8:1 (basic) or 1.2:1 (acidic) mole ratio melts. The polypyrrole prepared in the molten salt is electrochemically similar to polypyrrole prepared in acetonitrile; both materials are conductors when oxidizes, can be used as electrode materials for the electrochemistry of solution species (eg ferrocene) and are oxidized and reduced at ca. -200 mV vs SSCE in CH3CN. The cyclic voltammetry of materials prepared in both CH3CN and in the neutral melt has been investigated in the AlCl3:BuPyCl molten salt system and in CH3CN. The most significant differences appear in the kinetics of the redox chemistry. The most facile behavior was observed in a 0.8:1 melt with polypyrrole prepared in the 1:1 melt. (Author)
Pickup et al. (Sun,) studied this question.