Electrochemistry of Conductive Polymers: V . In Situ Spectroelectrochemical Studies of Polyaniline Films

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Abstract
In situ spectroelectrochemical studies have been carried out on polyaniline films formed on a reflective platinum disk electrode in acidic media by means of near‐normal incidence reflectance spectroelectrochemical techniques. The results indicate that there are four optically different species depending on the potential applied to the electrode. These are a leuco form absorbing at ∼320 nm, a radical cation at ∼440 nm, delocalized free electron states at ∼800 nm, and a quinoid form absorbing at ∼650 nm. The two forms, leuco and quinoid, are insulators, while the other two are conducting forms. Chemical transformations of these species into each other were also studied by derivative cyclic voltabsorptometry and the results are discussed.

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