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Novel photodimerization of 2,3-dibromopropene 2,3-二溴丙烯的新型光二聚化反应
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87035-1
M. Krafft
{"title":"Novel photodimerization of 2,3-dibromopropene","authors":"M. Krafft","doi":"10.1016/0047-2670(87)87035-1","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87035-1","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"14 1","pages":"391-393"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83823269","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: 3
General synthesis of new rose bengal derivatives with ether functional groups 含醚官能团的新玫瑰衍生物的一般合成
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87030-2
Danian Xu, Adriaan Vanloon, S. Linden, D. Neckers
{"title":"General synthesis of new rose bengal derivatives with ether functional groups","authors":"Danian Xu, Adriaan Vanloon, S. Linden, D. Neckers","doi":"10.1016/0047-2670(87)87030-2","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87030-2","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"11 1","pages":"357-363"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74595327","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: 8
Prototropism in aminophenols and anisidines: A reinvestigation 氨基酚和茴香胺的原向性:再研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87022-3
R. Sarpal, S. Dogra
{"title":"Prototropism in aminophenols and anisidines: A reinvestigation","authors":"R. Sarpal, S. Dogra","doi":"10.1016/0047-2670(87)87022-3","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87022-3","url":null,"abstract":"","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"30 1","pages":"263-276"},"PeriodicalIF":0.0,"publicationDate":"1987-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73791623","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: 16
The effect of transient quenching on the excimer kinetics of 2,5-diphenyloxazole 瞬态猝灭对2,5-二苯基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.J.S. Birch, A.D. Dutch, R.E. Imhof, B. Nadolski, I. Soutar
{"title":"The effect of transient quenching on the excimer kinetics of 2,5-diphenyloxazole","authors":"D.J.S. Birch,&nbsp;A.D. Dutch,&nbsp;R.E. Imhof,&nbsp;B. Nadolski,&nbsp;I. Soutar","doi":"10.1016/0047-2670(87)87020-X","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87020-X","url":null,"abstract":"<div><p>Excimer formation in 2,5-diphenyloxazole (PPO) in ethanol is shown not to obey the expected biexponential kinetics because of the presence of time-dependent quenching. Between 25 and 50°C the decay of monomer fluorescence can be described by a model based on the linear superposition of excimer reverse dissociation and transient quenching to give values for the diffusion coefficient and the interaction radius. However, at lower temperatures the model provides an incomplete description and the indications are that this is caused by the emergence of a heterogeneous distribution of PPO molecules.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 239-254"},"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)87020-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72260979","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
Chemistry of hydroxamic acid XII: Photochemistry of N-phenylbenzenecarbo-hydroxamic acid—studies on the mechanism of reaction 异羟肟酸化学XII:N-苯基苯甲酰胺酸的光化学反应机理研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87028-4
Ewa Lipczyńska-kochany, Jan Kochany
{"title":"Chemistry of hydroxamic acid XII: Photochemistry of N-phenylbenzenecarbo-hydroxamic acid—studies on the mechanism of reaction","authors":"Ewa Lipczyńska-kochany,&nbsp;Jan Kochany","doi":"10.1016/0047-2670(87)87028-4","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87028-4","url":null,"abstract":"<div><p>The quantum yield for the photodestruction of <em>N</em>-phenylbenzenecarbohydroxamic acid was determined in a number of solvents. Protonation was found to photostabilize both the hydroxamic acid and its anion. Quenching studies showed that the reaction in cyclohexane occurs from both the singlet and the triplet state, giving benzanilide as the main photoproduct. The results are discussed in the light of other recent investigations in the field.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 331-343"},"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)87028-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261006","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
Temperature-dependent fluorescence of acrylic polymers containing benzyl groups 含苄基的丙烯酸类聚合物的温度依赖性荧光
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87032-6
I.F. Piérola, D. Radić, L. Gargallo
{"title":"Temperature-dependent fluorescence of acrylic polymers containing benzyl groups","authors":"I.F. Piérola,&nbsp;D. Radić,&nbsp;L. Gargallo","doi":"10.1016/0047-2670(87)87032-6","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87032-6","url":null,"abstract":"<div><p>Fluorescence spectra were recorded as a function of temperature (10-60°C) for dilute dioxane solutions of four homopolymers containing the benzyl group in different positions with respect to the backbone, poly(α-benzylmethyl acrylate), poly(benzyl methacrylate), poly(monobenzyl itaconate) and poly(dibenzyl itaconate). In all cases the intensity decreases with increasing temperature. Arrhenius plots show two lines with different slopes intercepting at a point which we ascribe to a transition temperature between two states of the coil characterized by different activation energy parameters. The transition temperatures are around 29°C for all the systems except for poly(α-benzylmethyl acrylate) which gives simple linear behaviour without a transition. Activation energy parameters are compared for the different structures studied.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 375-380"},"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)87032-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261007","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
Equilibrium pK* of carbazole studied by the deprotonation reaction in ammoniacal aqueous media 咔唑在氨水介质中脱质子化反应的平衡pK*研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87025-9
Nitin Chattopadhyay, Mihir Chowdhury
{"title":"Equilibrium pK* of carbazole studied by the deprotonation reaction in ammoniacal aqueous media","authors":"Nitin Chattopadhyay,&nbsp;Mihir Chowdhury","doi":"10.1016/0047-2670(87)87025-9","DOIUrl":"https://doi.org/10.1016/0047-2670(87)87025-9","url":null,"abstract":"<div><p>Forward and backward rate constants for the excited state deprotonation reaction of carbazole in ammoniacal aqueous media were determined from both steady state (Weller's fluorescence quenching technique) and direct kinetic studies. The results establish that the equilibrium p<em>K</em><sup>*</sup> may be significantly different from the “apparent” p<em>K</em><sup>*</sup> obtained by the fluorometric titration method.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 301-309"},"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)87025-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72261052","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: 15
Electron spin resonance detection of oscillating peroxy radical concentration in the cumene—anthraquinone system 异丙烯-蒽醌体系中振荡过氧自由基浓度的电子自旋共振检测
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87010-7
A. Rockenbauer, M. Györ
{"title":"Electron spin resonance detection of oscillating peroxy radical concentration in the cumene—anthraquinone system","authors":"A. Rockenbauer,&nbsp;M. Györ","doi":"10.1016/0047-2670(87)87010-7","DOIUrl":"10.1016/0047-2670(87)87010-7","url":null,"abstract":"<div><p>Kinetic electron spin resonance spectroscopy has been applied in order to follow the variation in peroxy radical concentration in the cumene—anthraquinone system in the presence of oxygen and during UV irradiation. A periodic variation in concentration was observed, which can be caused either by hydrodynamic convections or by diffusion-controlled photochemical oscillations. For the latter case, a model was suggested in which the anthraquinone regeneration, controlled by the local oxygen concentration, can serve as a feedback mechanism, and the oscillations can be maintained by concentration gradients between the irradiated and the dark zones and by the different diffusion rates of oxygen and anthraquinone.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 109-116"},"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)87010-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80763943","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: 1
Electronic structure of quinoxaline-2,3(1H,4H)dione and its prototropic species in the ground and excited singlet states 喹诺啉-2,3(1H,4H)二酮及其原物质在基态和激发态的电子结构
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87023-5
Mannam Krishnamurthy, Karthik A. Iyer, Sneh K. Dogra
{"title":"Electronic structure of quinoxaline-2,3(1H,4H)dione and its prototropic species in the ground and excited singlet states","authors":"Mannam Krishnamurthy,&nbsp;Karthik A. Iyer,&nbsp;Sneh K. Dogra","doi":"10.1016/0047-2670(87)87023-5","DOIUrl":"10.1016/0047-2670(87)87023-5","url":null,"abstract":"<div><p>The solvent-dependent electronic absorption and fluorescence spectra indicate that quinoxaline-2,3(1<em>H</em>,4<em>H</em>)dione exists in its keto form, even in non-polar solvents, but the deprotonation reaction is observed from its enol form. The protonation reaction in comparison with those of the parent quinoxaline and 1,4-dimethylquinoxaline-2,3-dione suggests that the cation is formed by the gain of a proton on one of the carbonyl groups of the molecule.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 277-287"},"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)87023-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78607130","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
Molecular beam chemiluminescence studies of the systems SmSF6 and SmCCl4 SmSF6和SmCCl4体系的分子束化学发光研究
Journal of Photochemistry Pub Date : 1987-06-01 DOI: 10.1016/0047-2670(87)87004-1
U.B. Pavanaja, P.D. Naik, A.V. Sapre, P.N. Bajaj, K.V.S.Rama Rao, J.P. Mittal, R.M. Iyer
{"title":"Molecular beam chemiluminescence studies of the systems SmSF6 and SmCCl4","authors":"U.B. Pavanaja,&nbsp;P.D. Naik,&nbsp;A.V. Sapre,&nbsp;P.N. Bajaj,&nbsp;K.V.S.Rama Rao,&nbsp;J.P. Mittal,&nbsp;R.M. Iyer","doi":"10.1016/0047-2670(87)87004-1","DOIUrl":"10.1016/0047-2670(87)87004-1","url":null,"abstract":"<div><p>The beam gas chemiluminescence reactions of samarium with SF<sub>6</sub> and samarium with CCl<sub>4</sub> have been studied. The emission is attributed to SmF<sub>2</sub><sup>*</sup> and SmCl<sub>2</sub><sup>*</sup> emitters. The reactions are first order with respect to both metal and oxidizer gas at low pressures. The total cross-section, chemiluminescence cross-section and photon yields for the reactions have been found to be 280 Å<sup>2</sup>, 0.44 Å<sup>2</sup> and 0.0015 respectively for the samarium plus SF<sub>6</sub> reaction and 315 Å<sup>2</sup>, 0.32 Å<sup>2</sup> and 0.001 for the samarium plus CCl<sub>4</sub> reaction.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"38 ","pages":"Pages 43-53"},"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)87004-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82691877","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: 3
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