Abstract：
:During the maturation of red wines, the anthocyanins of grapes are transformed into pyranoanthocyanins, which possess a pyranoflavylium cation as their basic chromophore. Photophysical properties of the singlet and triplet excited states of a series of synthetic pyranoflavylium cations were determined at room temperature in acetonitrile solution acidified with 0.10 mol dm-3 trifluoroacetic acid (TFA, to inhibit competitive excited state proton transfer) and at 77 K in a rigid TFA-acidified isopropanol glass. In solution, the triplet states of these pyranoflavylium cations are efficiently quenched by molecular oxygen, resulting in sensitized formation of singlet oxygen, as confirmed by direct detection of the triplet-state decay by laser flash photolysis and of singlet oxygen monomol emission in the near infrared. The strong visible light absorption, the relatively small singlet-triplet energy differences, the excited state redox potentials and the reasonably long lifetimes of pyranoflavylium triplet states in the absence of molecular oxygen suggest that they might be useful as triplet sensitizers and/or as cationic redox initiators in polar aprotic solvents like acetonitrile.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Silva GTM,Thomas SS,Silva CP,Schlothauer JC,Baptista MS,Freitas AA,Bohne C,Quina FHdoi
10.1111/php.12973subject
Has Abstractpub_date
2019-01-01 00:00:00pages
176-182issue
1eissn
0031-8655issn
1751-1097journal_volume
95pub_type
杂志文章abstract：:In photodynamic therapy with topically applied delta-aminolevulinic acid porphyrins are acting as photosensitizers. The profile of porphyrin metabolites in normal or in neoplastic skin after administration of delta-aminolevulinic acid has not been determined in detail yet. Thus, to study porphyrin biosynthesis in huma...
journal_title：Photochemistry and photobiology
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doi：10.1111/j.1751-1097.1997.tb03146.x
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journal_title：Photochemistry and photobiology
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1991.tb08475.x
更新日期：1991-01-01 00:00:00
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journal_title：Photochemistry and photobiology
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更新日期：1998-10-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12183
更新日期：2014-01-01 00:00:00
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更新日期：2007-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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更新日期：2013-05-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章,评审
doi：10.1111/j.1751-1097.1996.tb02450.x
更新日期：1996-08-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.2010.00863.x
更新日期：2011-03-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：
更新日期：1999-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12981
更新日期：2018-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12836
更新日期：2018-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 社论
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更新日期：2012-05-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1995.tb02352.x
更新日期：1995-05-01 00:00:00
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pub_type： 杂志文章
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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更新日期：1994-02-01 00:00:00
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更新日期：2020-01-01 00:00:00
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更新日期：2020-05-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1990.tb08686.x
更新日期：1990-10-01 00:00:00
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pub_type： 杂志文章
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更新日期：1989-09-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1562/0031-8655(2000)071<0737:miamft>2.0.co;2
更新日期：2000-06-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章,评审
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更新日期：2017-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：
更新日期：1998-10-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12540
更新日期：2016-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章,评审
doi：10.1562/0031-8655(2000)072<0421:OSRIP>2.0.CO;2
更新日期：2000-10-01 00:00:00
