2000
DOI: 10.1021/jp000084y
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Photophysical Properties of Hydroxy-Substituted Flavothiones

Abstract: Flavothione and a number of synthesized hydroxy-(mono-and di-) substituted flavothiones have been thoroughly examined, particularly regarding their absorption, emission, photophysical (triplet yields and lifetimes), and oxygen-photosensitizing characteristics. These were all studied as a function of the nature of the solvent (four), which was particularly critical in terms of aiding in determining the energy and configurational nature of the lowest triplet state as well as the mechanism of intersystem crossing… Show more

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Cited by 22 publications
(62 citation statements)
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References 14 publications
(26 reference statements)
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“…The experimental errors on T were estimated to be about Ϯ10%, whereas those on T and T were Ϯ15%. The singlet oxygen yields ( ⌬ ) were determined by measuring the phosphorescence intensity of O 2 ( 1 ⌬ g ) with a germanium diode detector in air-equilibrated solutions (14,15) and by using phenalenone ( ⌬ ϭ 0.97) (16) as a reference.…”
Section: Photophysical Measurementsmentioning
confidence: 99%
“…The experimental errors on T were estimated to be about Ϯ10%, whereas those on T and T were Ϯ15%. The singlet oxygen yields ( ⌬ ) were determined by measuring the phosphorescence intensity of O 2 ( 1 ⌬ g ) with a germanium diode detector in air-equilibrated solutions (14,15) and by using phenalenone ( ⌬ ϭ 0.97) (16) as a reference.…”
Section: Photophysical Measurementsmentioning
confidence: 99%
“…The photophysical properties of these compounds were studied in some detail (1). Briefly, the consequences of replacing the carbonyl (CϭO) group of flavones by the thione (CϭS) group generally include (1) a large decrease in the energy of the n, * (1,3) and , * (1,3) states (leading to absorption of visible light); (2) the increase in the quantum yields of triplet formation ( T ) and singlet oxygen photosensitization ( ⌬ ); and (3) the appearance of photobiological activity and photochemistry under visible light irradiation (1).…”
Section: Formulamentioning
confidence: 99%
“…This study is part of a series of efforts with the ultimate goal of developing environmentally friendly photopesticides (1)(2)(3). Our strategy has been based on the search of chemical modifications of nontoxic, nonphototoxic, naturally occurring compounds, which may lead to still nontoxic but strongly photoactive derivatives.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…These are described by absorption and emission spectroscopy, triplet yield and life times. They are used as oxygen photosensitizes [4,5] and photobiological activities and also as green pesticides as they inhibit the growth of fungi, bacteria and mammalian cells. [6,7] In the mid-1950s, Baker synthesized FTs and isoflavothiones using phosphorus pentasulfide in dry benzene or xylene under reflux.…”
Section: Introductionmentioning
confidence: 99%