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Photosensitizing Properties of 6H ‐Dibenzo[ b, h ]xanthene Derivatives
Author(s) -
Teixeira Rodolfo I.,
dos Santos Iago C.,
Garden Simon J.,
Carneiro Paula F.,
Ferreira Vitor F.,
de Lucas Nanci C.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702649
Subject(s) - xanthene , photochemistry , flash photolysis , chemistry , singlet oxygen , quenching (fluorescence) , excited state , photosensitizer , reactivity (psychology) , ultrafast laser spectroscopy , fluorescence , triplet state , singlet state , absorption (acoustics) , absorption spectroscopy , oxygen , organic chemistry , molecule , laser , materials science , reaction rate constant , kinetics , alternative medicine , pathology , optics , composite material , quantum mechanics , nuclear physics , medicine , physics
Dibenzoxanthenes are a class of compounds that have attracted attention due principally to their photochemical and photophysical properties. The absorption spectra of the dibenzo[ b, h ]xanthene derivatives revealed a blue shift in the absorption spectra on increasing the solvent polarity. The laser flash photolysis technique was used to study the reactivity of the triplet excited states of the dibenzo[ b, h ]xanthene‐5,6,8,13‐tetrone derivatives. Hydrogen atom or electron donors, including model biological compounds, led to quenching of the excited state and formation of a new transient, thus revealing type I photosensitizer reactivity. Further, energy transfer to oxygen to generate singlet oxygen was also observed demonstrating type II photosensitization. Additionally, the novel dibenzo[ b, h ]xanthene‐5,6,8,13‐tetrol acetates revealed fluorescence emission with maximum wavelengths between 350–360 nm.