IN-SITU POLARIZATION MODULATION-FOURIER TRANSFORM-INFRARED SPECTROELECTROCHEMISTRY OF PHENAZINE AND PHENOTHIAZINE DYE FILMS AT POLYCRYSTALLINE GOLD ELECTRODES

Polarization modulation-Fourier transform infrared (PM-FTir) spectra w ere obtained in situ for polymer films of neutral red and thionine, an d for a film of leucomethylene blue generated on a gold electrode as a function of potential. The spectra of the polymer films revealed that the aromatic rings lie mostly parallel to the electrode surface in bo th the reduced and oxidized forms. In contrast, the spectrum of the ad sorbed leuco methylene blue film indicated that most of the molecules within the film are oriented perpendicular to the gold surface.