Abstract
Two phthalein dyes in aqueous polyvinyl alcohol solutions of pH 8.5 have been investigated: fluorescein and phenolphthalein. Competitive pathways of deactivation of their energetically excited states have been followed by the use of spectroscopic and photoelectric techniques. Radiative, nonradiative, and charge separation processes followed by electron transfer have been measured by absorption, fluorescence, and photoacoustic spectroscopy accompanied by photovoltage/photocurrent generation in a photoelectrochemical cell. It is shown that, despite their being only a slight difference in molecular structure between the two dyes, their spectral as well as photoelectric behavior is significantly different.
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Boguta, A., Wróbel, D. Fluorescein and Phenolphthalein—Correlation of Fluorescence and Photoelectric Properties. Journal of Fluorescence 11, 129–137 (2001). https://doi.org/10.1023/A:1016681502731
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DOI: https://doi.org/10.1023/A:1016681502731