Abstract
Substituent effects on the photophysical properties of 9-arylxanthyl and 9-arylthioxanthyl cations have been examined. These properties include fluorescence quantum yields, excited-state lifetimes, radiative and non-radiative rate constants. A dramatic substituent effect is observed on these properties for the xanthyl cations, with an increase in the electron-donating ability of the substituents resulting in a decrease in the fluorescence lifetimes and quantum yields and a corresponding increase in the non-radiative rate constants. In contrast, little or no substituent effect is seen in the thioxanthyl cation series. Possible explanations for the differing substituent effects are considered.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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