Photochemistry of Organic Compounds

Kln, Petr; Wirz, Jakob

doi:10.1002/9781444300017

Cited by 509 publications

(496 citation statements)

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“…Direct photochemistry occurs when the organic species features one or more chromophores, i.e., it directly absorbs incoming radiation, leading to possible photochemical breakdown of the compound. Indirect photochemistry occurs when another species (known as a photosensitizer) absorbs radiation, subsequently transferring electronic energy to or exchanging electrons with another moiety which becomes either an excited species or radical intermediate, which in turn undergoes intra-or intermolecular transformations (Klan and Wirz, 2009). Secondary chemical reactions can also be triggered by the presence of reactive species, such as radicals, formed by direct irradiation of photoinitiators.…”

Section: Photophysics and Photochemistrymentioning

confidence: 99%

Organics in environmental ices: sources, chemistry, and impacts

et al. 2012

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Abstract. The physical, chemical, and biological processes involving organics in ice in the environment impact a number of atmospheric and biogeochemical cycles. Organic material in snow or ice may be biological in origin, deposited from aerosols or atmospheric gases, or formed chemically in situ. In this manuscript, we review the current state of knowledge regarding the sources, properties, and chemistry of organic materials in environmental ices. Several outstanding questions remain to be resolved and fundamental data gathered before an accurate model of transformations and transport of organic species in the cryosphere will be possible. For example, more information is needed regarding the quantitative impacts of chemical and biological processes, ice morphology, and snow formation on the fate of organic material in cold regions. Interdisciplinary work at the interfaces of chemistry, physics and biology is needed in order to fully characterize the nature and evolution of organics in the cryosphere and predict the effects of climate change on the Earth's carbon cycle.

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Section: Photophysics and Photochemistrymentioning

confidence: 99%

Organics in environmental ices: sources, chemistry, and impacts

et al. 2012

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“…First, the influence of sulfide substituents on the quantum yield for product formation was probed. Using a ferrioxalate actinometer 38 we have determined the quantum yield (Φ) for the conversion of 1 in degassed methanol solutions, and the results are summarized in Table 1. The effect of added oxygen on the quantum yield is generally small and will be discussed further below.…”

Section: Scheme 2 Potential Intermediates and Pathways In The Photolmentioning

confidence: 99%

“…2 has been previously derived to describe the variation in quantum yield when there are two quenchable pathways. 38 The expression includes two SV quenching constants, ‫ܭ‬ ௌ ௌ and ‫ܭ‬ ௌ ் , for the singlet and triplet pathways, and the ratio of their quantum yields (Φ ் Φ ௌ ⁄ ). A regression analysis of Eq.…”

Section: Triplet Sensitization/quenching Studiesmentioning

confidence: 99%

Mechanistic Studies of the Photoinduced Quinone Trimethyl Lock Decaging Process

et al. 2017

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Mechanistic studies of a general reaction that decages a wide range of substrates on exposure to visible light are described. The reaction involves a photochemically initiated reduction of a quinone mediated by an appended thioether. After reduction, a trimethyl lock system incorporated into the quinone leads to thermal decaging. The reaction could be viewed as an electron-transfer initiated reduction of the quinone or as a hydrogen abstraction -Norrish Type II -reaction. Product analysis, kinetic isotope effects, stereochemical labeling, radical clock, and transient absorption studies support the electron transfer mechanism. The differing reactivities of the singlet and triplet states are determined, and the ways in which this process deviates from typical quinone photochemistry are discussed. The mechanism suggests strategies for extending the reaction to longer wavelengths that would be of interest for applications in chemical biology and in a therapeutic setting.

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“…[14][15][16][17][18][19][20] Coordination chemistry of quinones is also quite rich from the perspective of designing magnetic materials 21 and understanding photophysical properties. 22 The studies of quinonoid compounds have focused on a broad spectrum of topics viz occurrence in nature, 2 syntheses, 23 cycloaddition reactions, 24 photochemistry and pulse radiolysis, 1,25,26 computational chemistry, etc. 27 The copiousness of articles describing the aforementioned multi-functional aspects serves as a grand testimonial to the contemporary interest in quinone chemistry.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in 1,4-benzoquinone chemistry

Abraham¹,

Joshi²,

Pardasani³

et al. 2011

J. Braz. Chem. Soc.

169

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As 1,4-benzoquinonas são encontradas em toda a natureza, podendo ser sintetizadas por diversas estratégias. Esta revisão apresenta os desenvolvimentos recentes das metodologias de síntese, das reações de ciclo adição, da química computacional e dos estudos de pulso radiolítico. Destaca ainda a sua significância química e biológica e de seus compostos derivados.1,4-Benzoquinones are ubiquitous in nature and can be synthesized by diverse strategies. Recent developments on their synthetic methodologies, cycloaddition reactions, computational chemistry and pulse radiolytic studies are reported in this review. Their chemical and biological significance as well as their derivates' are also covered.

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Photochemistry of Organic Compounds

Cited by 509 publications

References 0 publications

Organics in environmental ices: sources, chemistry, and impacts

Organics in environmental ices: sources, chemistry, and impacts

Mechanistic Studies of the Photoinduced Quinone Trimethyl Lock Decaging Process

Recent advances in 1,4-benzoquinone chemistry

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