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Nitroxide reduction by electron transfer from the eosin triplet state: electron paramagnetic resonance and flash photolysis studies 由伊红三重态电子转移的氮氧化物还原:电子顺磁共振和闪光光解研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87013-2
A. Seret, E. Gandin, A. Van De Vorst
{"title":"Nitroxide reduction by electron transfer from the eosin triplet state: electron paramagnetic resonance and flash photolysis studies","authors":"A. Seret,&nbsp;E. Gandin,&nbsp;A. Van De Vorst","doi":"10.1016/0047-2670(87)87013-2","DOIUrl":"10.1016/0047-2670(87)87013-2","url":null,"abstract":"<div><p>The paramagnetism loss of nitroxide, photosensitized by eosin, was analysed in basic aqueous and micellar media using electron paramagnetic resonance (EPR) spectroscopy. In cetyltrimethylammonium bromide micelles and sodium bis(2-ethylhexyl)sulphosuccinate—<em>n</em>-heptane microemulsions, the paramagnetism decay curves are monoexponential. This is not the case in neat water and sodium dodecylsulphate micelles, for which more complex decays were recorded. It is concluded from flash photolysis measurements that the eosin triplet state is physically quenched by nitroxide and that the latter can be reduced by electron transfer either from the triplet state or from the semireduced form of eosin. This sequence of reactions was confirmed by experiments in micellar media and leads to an understanding of the EPR results.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 145-155"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87013-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85237756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Ring contraction of cyclic olefins: chemical processes specific to electronically excited states? 环状烯烃的环收缩：电子激发态特有的化学过程？
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87018-1
Guy J. Collin, George R. De Maré
{"title":"Ring contraction of cyclic olefins: chemical processes specific to electronically excited states?","authors":"Guy J. Collin,&nbsp;George R. De Maré","doi":"10.1016/0047-2670(87)87018-1","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87018-1","url":null,"abstract":"<div><p>The photochemical ring cleavage and ring contraction reactions of cyclic olefins are reviewed. The retro Diels-Alder processes cannot be unambiguously linked to a particular electronic state. Although there seem to be some differences between the bicycloalkane products observed in the photosensitization (triplet) and the direct photolysis (singlet) of cyclo-olefins, these differences do not warrant assignment of the formation of a given bicycloalkane to a particular electronic state. Ring contraction to the corresponding vinylcycloalkane can occur from either the triplet or the “hot” ground state. The formation of methylenecycloalkanes appears to be a reaction specific to a Rydberg singlet state of the cycloalkenes.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 205-215"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87018-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Photophysical evidence for intramolecular energy transfer in insoluble polymeric benzophenone (benzoylated polystyrene beads) 不溶性聚合物二苯甲酮(苯甲酰化聚苯乙烯珠)分子内能量转移的光物理证据
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87033-8
F. Wilkinson, C. Willsher, J. Bourdelande, J. Font, J. Greuges
{"title":"Photophysical evidence for intramolecular energy transfer in insoluble polymeric benzophenone (benzoylated polystyrene beads)","authors":"F. Wilkinson, C. Willsher, J. Bourdelande, J. Font, J. Greuges","doi":"10.1016/0047-2670(87)87033-8","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87033-8","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"15 1","pages":"381-384"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73420399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
The photolysis of pyrene and perylene in cyclohexane liquid solution from highly excited electronic states 环己烷溶液中高激发态芘和苝的光解反应
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87016-8
M. Lamotte, J. Pereyre, J. Joussot‐Dubien, R. Lapouyade
{"title":"The photolysis of pyrene and perylene in cyclohexane liquid solution from highly excited electronic states","authors":"M. Lamotte, J. Pereyre, J. Joussot‐Dubien, R. Lapouyade","doi":"10.1016/0047-2670(87)87016-8","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87016-8","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"37 1","pages":"177-188"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91314071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Photophysical evidence for intramolecular energy transfer in insoluble polymeric benzophenone (benzoylated polystyrene beads) 不溶性聚合物二苯甲酮（苯甲酰化聚苯乙烯珠）分子内能量转移的光物理证据
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87033-8
F. Wilkinson, C.J. Willsher, J.L. Bourdelande, J. Font, J. Greuges
{"title":"Photophysical evidence for intramolecular energy transfer in insoluble polymeric benzophenone (benzoylated polystyrene beads)","authors":"F. Wilkinson,&nbsp;C.J. Willsher,&nbsp;J.L. Bourdelande,&nbsp;J. Font,&nbsp;J. Greuges","doi":"10.1016/0047-2670(87)87033-8","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87033-8","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 381-384"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87033-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Photosensitized conjugation of methyl 9,12-octadecadienoate 9,12-十八碳二烯酸甲酯的光敏偶联
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87029-6
Michel Julliard, Alain Luciani, Jean-Louis Chevalier, Georges Cecchi, Eugène Ucciani
{"title":"Photosensitized conjugation of methyl 9,12-octadecadienoate","authors":"Michel Julliard,&nbsp;Alain Luciani,&nbsp;Jean-Louis Chevalier,&nbsp;Georges Cecchi,&nbsp;Eugène Ucciani","doi":"10.1016/0047-2670(87)87029-6","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87029-6","url":null,"abstract":"<div><p>The conjugation of methyl 9,12-octadecadienoate (DH) is a reaction of industrial interest. It has been photochemically performed with iodine as photosensitizer (λ=520nm). The reaction is a radical chain process which is inhibited by galvinoxyl, the overall quantum yield decreasing from 1.9 to 1.3 with the irradiation time. The rate is given by the empirical expression <em>k</em> [<em>i</em>]<sup>0.56</sup> [ DH]<sup>1.22</sup> [I<sub>2</sub>]<sup>0.40</sup> where <em>i</em> is the light intensity. The reaction leads to a mixture of methyl 9,11-octadecadienoate and methyl 10,12-octadecadienoate with <em>E,E</em>:<em>Z,E</em>:<em>Z,Z</em> in the molar ratio of 0.72:0.26:0.02 in 80% yield.</p><p>This study illustrates the possibility of applying solar radiation to an industrial process.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 345-355"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87029-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72260982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Low temperature fluorescence lifetime of aromatic solutes in 3-methylpentane: investigation using Čerenkov radiation 芳香族溶质在3-甲基戊烷中的低温荧光寿命：Čerenkov辐射研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87034-X
J. Mayer, M. Szadkowska-Nicze, J. Kroh
{"title":"Low temperature fluorescence lifetime of aromatic solutes in 3-methylpentane: investigation using Čerenkov radiation","authors":"J. Mayer,&nbsp;M. Szadkowska-Nicze,&nbsp;J. Kroh","doi":"10.1016/0047-2670(87)87034-X","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87034-X","url":null,"abstract":"<div><p>The fluorescence lifetime-temperature dependences for naphthalene and pyrene in 3-methylpentane were investigated in the temperature range 92 - 298 K using Čerenkov light as the source of photochemical excitation. The results are explained in terms of temperature-dependent intersystem crossing from S<sub>1</sub> to the adjacent triplet levels.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 385-389"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87034-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
The effect of transient quenching on the excimer kinetics of 2,5-diphenyloxazole 瞬态猝灭对2,5-二苯氧恶唑准分子动力学的影响
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87020-X
D. Birch, A. Dutch, R. Imhof, B. Nadolski, I. Soutar
{"title":"The effect of transient quenching on the excimer kinetics of 2,5-diphenyloxazole","authors":"D. Birch, A. Dutch, R. Imhof, B. Nadolski, I. Soutar","doi":"10.1016/0047-2670(87)87020-X","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87020-X","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"100 1","pages":"239-254"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77566054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Absorption spectra of NONH2 isomers and NO in liquid ammonia solution: possible implications for Jupiter 液态氨溶液中NONH2异构体和NO的吸收光谱:对木星的可能影响
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87003-X
L.F. Phillips
{"title":"Absorption spectra of NONH2 isomers and NO in liquid ammonia solution: possible implications for Jupiter","authors":"L.F. Phillips","doi":"10.1016/0047-2670(87)87003-X","DOIUrl":"10.1016/0047-2670(87)87003-X","url":null,"abstract":"<div><p>Molar absorption coefficients of NONH<sub>2</sub> have been measured for bands at 285 nm, 365 nm and 550 nm, and the bands assigned to the tautomeric species HNNOH, NH<sub>2</sub>NO and HNNHO respectively. Solutions of NO in liquid ammonia have an absorption band at 425 nm which is assigned to a charge transfer complex of NO with NH<sub>3</sub>. It is suggested that coloured solutions of NONH<sub>2</sub> and NO in liquid ammonia may contribute to the colours observed in the atmosphere of Jupiter.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 35-41"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87003-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78913578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemistry of hydroxamic acid XII: Photochemistry of N-phenylbenzenecarbo-hydroxamic acid—studies on the mechanism of reaction 羟肟酸的化学十二:n -苯基苯碳羟肟酸的光化学-反应机理的研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87028-4
E. Lipczynska‐kochany, J. Kochany
{"title":"Chemistry of hydroxamic acid XII: Photochemistry of N-phenylbenzenecarbo-hydroxamic acid—studies on the mechanism of reaction","authors":"E. Lipczynska‐kochany, J. Kochany","doi":"10.1016/0047-2670(87)87028-4","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87028-4","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"32 1","pages":"331-343"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83099332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
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