Abstract
The electrochromism of an octacyanophthalocyanine‐potassium complex film was investigated byin situ visible and Raman spectroscopies in and . A new absorption band was observed in the range 700–900 nm during electrochemical reduction in those electrolytes. The absorbance at 880 nm saturated with the charge of 1 F/mol in the alkaline electrolyte. The Raman spectra showed that the isoindole moiety and the azaporphyrin ring of were affected by the reduction. From both the visible and Raman spectra, it was found that molecules in the film were protonated at one of the nitrogens in positions 6, 13, 20, and 27 by the reduction. The mechanism for the protonation of in the alkaline electrolyte was considered to be analogous to that of the hydrogen evolution in alkaline electrolytes. It seems that a charge‐transfer complex in the film plays an important role in the electrochromism of film.
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