Abstract：
:The infrared spectrum of monomeric unsubstituted coumarin (C9H6O2; 2H-1-benzopyran-2-one), isolated in solid argon at 10 K is presented and assigned. The UV-induced (lambda>200 nm) unimolecular photochemistry of the matrix-isolated compound was studied experimentally. Three main photoreactions were observed: (a) decarboxylation of the compound and formation of benzocyclobutadiene and CO2, with the Dewar form of coumarin as intermediate; (b) isomerization of the compound, leading to production of a conjugated ketene; and (c) decarbonylation, leading to formation of CO and benzofuran complex. Further decomposition of benzofuran to produce ethynol is suggested. Photochannels (a) and (b) correspond to those previously observed for matrix-isolated alpha-pyrone and its sulfur analogs (Phys. Chem. Chem. Phys. 2004, 6, 929; J. Phys. Chem. A 2006, 110, 6415), while route (c) is similar to the UV-induced photochemistry of coumarin in the gaseous phase (J. Phys. Chem. A 2000, 104, 1095). Interpretation of the experimental data is supported by extensive calculations performed at the B3LYP/6-311++G(d,p), MP2/6-31G(d,p) and MP2/6-311++G(d,p) levels.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Kuş N,Breda S,Reva I,Tasal E,Ogretir C,Fausto Rdoi
10.1111/j.1751-1097.2007.00152.xsubject
Has Abstractpub_date
2007-09-01 00:00:00pages
1237-53issue
5eissn
0031-8655issn
1751-1097pii
PHP152journal_volume
83pub_type
杂志文章abstract：:People can get oral cancers from UV (290-400 nm) exposures. Besides high outdoor UV exposures, high indoor UV exposures to oral tissues can occur when consumers use UV-emitting tanning devices to either tan or whiten their teeth. We compared the carcinogenic risks of skin to oral tissue cells after UVB (290-320 nm) ex...
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
doi：10.1111/j.1751-1097.1994.tb05066.x
更新日期：1994-04-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1992.tb09740.x
更新日期：1992-12-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1996.tb09628.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
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更新日期：1993-12-01 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
doi：10.1111/j.1751-1097.1989.tb04136.x
更新日期：1989-07-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/j.1751-1097.2011.01029.x
更新日期：2012-01-01 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.tb08697.x
更新日期：1990-10-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1992.tb04229.x
更新日期：1992-02-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12353
更新日期：2015-05-01 00:00:00
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journal_title：Photochemistry and photobiology
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doi：10.1111/php.12301
更新日期：2015-03-01 00:00:00
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journal_title：Photochemistry and photobiology
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doi：
更新日期：1998-09-01 00:00:00
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更新日期：2019-11-01 00:00:00
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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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更新日期：2001-08-01 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：2012-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 评论,杂志文章
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更新日期：2019-09-01 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：2016-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2018-03-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.2012.01194.x
更新日期：2012-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.1995.tb02361.x
更新日期：1995-09-01 00:00:00
