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Littérature scientifique sur le sujet « Flash photolysis : Free radicals (Chemistry) »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 15 février 2022

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Articles de revues sur le sujet "Flash photolysis : Free radicals (Chemistry)"

Bensasson, R. V. "Flash photolysis, pulse radiolysis - Contribution the chemistry of free radicals in biological systems." Bulletin des Sociétés Chimiques Belges 92, no. 6-7 (2010): 615–22. http://dx.doi.org/10.1002/bscb.19830920606.

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Levin, Peter P., Alexei F. Efremkin, and Igor V. Khudyakov. "Kinetics of benzophenone ketyl free radicals recombination in a polymer: reactivity in the polymer cage vs. reactivity in the polymer bulk." Photochemical & Photobiological Sciences 14, no. 5 (2015): 891–96. http://dx.doi.org/10.1039/c5pp00024f.

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The decay kinetics of intermediates produced under photolysis of benzophenone (B) dissolved in soft rubber poly(ethylene-co-butylene) films (abbreviated asE) was studied by ns laser flash photolysis in the temperature range of 263–313 K.

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McGarry, P. F., and J. C. Scaiano. "The absolute kinetics for radical addition and electronic energy transfer to [1.1.1]propellane." Canadian Journal of Chemistry 76, no. 10 (1998): 1474–89. http://dx.doi.org/10.1139/v98-191.

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Free radicals react more readily with [1.1.1]propellane, 1, than with styrene. For example Et3Si· reacts with 1 and styrene with rate constants of 6 × 108 M-1 s-1 and 2 × 108 M-1 s-1, respectively. Fluorenone, phenanthrene, triphenylene, benzophenone, and pyrene transfer electronic energy to 1 with rate constants well below the diffusion-controlled limit. For example, triplet benzophenone is quenched by 1 with a bimolecular rate constant of 9.9 × 106 M-1 s-1. A linear dependence of the log of the quenching rate constants, log kq, upon the excited-state energy of the donors is found.Key words:

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Scaiano, J. C., Terrence J. Connolly, Nadereh Mohtat, and Claudette N. Pliva. "Exploratory study of the quenching of photosensitizers by initiators of free radical "living" polymerization." Canadian Journal of Chemistry 75, no. 1 (1997): 92–97. http://dx.doi.org/10.1139/v97-014.

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Several compounds of the type PhCR1R2-TEMPO (where TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxide) have been prepared and examined as potential photosensitized initiators for "living" free radical polymerizations. For example, these compounds are excellent quenchers of triplet xanthone (rate constants in the range (8.0–13) × 108 M−1 s−1) and result in the formation of benzylic and TEMPO radicals. The importance of excited state energy and nature of the excited triplet state have also been explored. We also tested pyrene as a possible singlet sensitizer. While pyrene fluorescence is efficiently

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Timtcheva, I., J. Zechner, N. Getoff, and St Minchev. "Photoreactions of 2,6-Diphenyl-s-Hydrindacene-1,3,5,7-Tetrone and its Derivatives in Polar and Nonpolar Solvents." Zeitschrift für Naturforschung A 40, no. 10 (1985): 1040–44. http://dx.doi.org/10.1515/zna-1985-1010.

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Continuous UV-irradiation as well as flash-photolysis of derivatives of 2,6-diphenyl-s-hydrindacene- 1,3,5,7-tetrone (bisindandione - BID), substituted in the p and p' positions of the phenyl rings, was found to result in the formation of stable photoproducts, of which the absorption, emission and excitation maxima coincide with those of the corresponding diarylidene-benzodifurandiones (bis-benzylidenephthalides - BBPh). Studies of light intensity effects gave evidence that this isomerization proceeds via a semi-isomerized intermediate. Additionally, flash-photolysis of BID showed the formatio

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Fayed, Tarek A., Gunter Grampp, and Stephan Landgraf. "Fluorescence quenching of aromatic hydrocarbons by nitroxide radicals: a mechanismatic study." International Journal of Photoenergy 1, no. 3 (1999): 173–76. http://dx.doi.org/10.1155/s1110662x99000306.

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The fluorescence quenching of phenanthrene (Phen), 9-cyanophenanthrene (CPhen), 9-cyanoanthracene (CA), perylene (Per), 9,10-dicyanoanthracene (DCA), and 9,10-diphenylanthracene (DPA) using stable nitroxide radicals as quenchers has been studied by steady state and flash photolysis measurements. Both linearity and deviation from linearity in the Stern-Volmer plots have been observed. The active sphere model was used to discuss the upward curvature of the Stern-Volmer plots in case of Per, DCA, and DPA. The bimolecular quenching rate constant(kq)of Phen, CPhen and CA was found to be diffusion c

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Markovic, Dejan. "Photochemistry of aromatic ketones in sodium dodecyl sulphate micelles in the presence of unsaturated fatty acids." Journal of the Serbian Chemical Society 69, no. 2 (2004): 107–15. http://dx.doi.org/10.2298/jsc0402107m.

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Laser-flash photolysis has been employed to characterize the behaviour of the free radicals created in the photochemical reaction of benzophenone (BZP), as well as of its lipoidal derivative, benzophenone-4-heptyl-4?-pentanoic acid (BHPA), with chosen unsaturated fatty acids in sodium dodecyl sulphate micelles. The calculated rate constants were used to study the "cage effect" i.e., the recombination of the created radical-pairs (BZP, BHPA ketyl radical - lipid radical) inside the highly limited space of the SDS micelles. The "cage effect" appears to be the dominant event inside SDS micelles,

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Taras-Goslinska, Katarzyna, Fabrizio Vetica, Sebastián Barata-Vallejo, Virginia Triantakostanti, Bronisław Marciniak, and Chryssostomos Chatgilialoglu. "Converging Fate of the Oxidation and Reduction of 8-Thioguanosine." Molecules 24, no. 17 (2019): 3143. http://dx.doi.org/10.3390/molecules24173143.

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Thione-containing nucleobases have attracted the attention of the scientific community for their application in oncology, virology, and transplantology. The detailed understanding of the reactivity of the purine derivative 8-thioguanosine (8-TG) with reactive oxygen species (ROS) and free radicals is crucial for its biological relevance. An extensive investigation on the fate of 8-TG under both reductive and oxidative conditions is here reported, and it was tested by employing steady-state photooxidation, laser flash photolysis, as well as γ-radiolysis in aqueous solutions. The characterizatio

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Sumiyoshi, T., W. Weber, and W. Schnabel. "Thiophosphonyl Radicals Photolytic Generation and Reactivity Towards Olefinic Compounds." Zeitschrift für Naturforschung A 40, no. 6 (1985): 541–43. http://dx.doi.org/10.1515/zna-1985-0601.

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Upon irradiation with UV light (λ = 347 nm), 2,4,6-trimethylbenzoyldiphenylphosphine sulfide was found to be fragmented into free radicals by α-scission (F(k) = 0.3 ± 0.1): Flash photolysis studies revealed that the optical absorption spectrum of diphenylthiophosphonyl radicals, S = P(Ph)2. possesses a strong band with λmax = 340 nm and a somewhat weaker band with λmax ≈ 500 nm (e340nm = 1.2 ± 0.2) · 104 1/mol cm). The reactivity towards olefinic compounds, M, is 10 to 30 times lower than in the case of O = P(Ph)2 radicals. Typical bimolecular rate constants (in 1/mol s) of the reaction of S =

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Telitel, Sofia, Frédéric Dumur, Thomas Faury та ін. "New core-pyrene π structure organophotocatalysts usable as highly efficient photoinitiators". Beilstein Journal of Organic Chemistry 9 (7 травня 2013): 877–90. http://dx.doi.org/10.3762/bjoc.9.101.

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Eleven di- and trifunctional compounds based on a core-pyrene π structure (Co_Py) were synthesized and investigated for the formation of free radicals. The application of two- and three-component photoinitiating systems (different Co_Pys with the addition of iodonium or sulfonium salts, alkyl halide or amine) was investigated in detail for cationic and radical photopolymerization reactions under near-UV–vis light. The proposed compounds can behave as new photocatalysts. Successful results in terms of rates of polymerization and final conversions were obtained. The strong MO coupling between th

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Thèses sur le sujet "Flash photolysis : Free radicals (Chemistry)"

Zhao, Zhijun. "Laser flash photolysis studies of some gas phase reactions of atmospheric interest." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31790.

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Thesis (Ph.D)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2010.<br>Committee Chair: Wine, Paul; Committee Member: Huey, Greg; Committee Member: Mulholland, James; Committee Member: Nenes, Athanasios; Committee Member: Weber, Rodney. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Simpson, Nigel J. K. "Studies of transient free radicals in solution by flash photolysis E.S.R." Thesis, University of Oxford, 1990. http://ora.ox.ac.uk/objects/uuid:dd9a8aa9-f68a-4362-af7e-6c052fa3a5fe.

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An introduction is presented to the nature of polarized and non-polarized transient spin resonance signals, produced by flash-photolysis e.s.r., followed by a description of the equipment used for experimental work. Theories of Chemically Induced Dynamic Electron Spin Polarization are reviewed and various models introduced to illustrate these concepts. A description is given of the first thorough investigation into the effect of CIDEP polarization transfer down a free radical chain and expands upon the consequences of hyperfine-dependent relaxation and the relative signs of coupling constants

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Smith, M. J. C. "Flash photolysis studies of gas phase free radical reactions." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355811.

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Laine, Patrick L. "Laser flash photolysis studies of halogen atom reactions of atmospheric interest." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42817.

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The Earth's atmosphere is a large photochemical reactor consisting primarily of N2 (~78%) and O2 (~21%) with Ar and water vapor being the next most abundant constituents. All of the remaining gases in the atmosphere are referred to as 'trace gases', and they play a critical role in understanding climate change, urban air quality, ozone production and depletion, and in determining the overall 'health' of the atmosphere. These trace components are present in our atmosphere with mixing ratios, i.e., mole fractions, ranging from sub parts per trillion to several hundred parts per million. One c

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Friedline, Robert Alan. "The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11157.

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t-Butoxyl radical has been used as a chemical model for hydrogen abstractions in many enzymatic and biological systems. However, the question has arisen as to how well this reactive intermediate mimics these systems. In addressing this concern, absolute rate constants and Arrhenius parameters for hydrogen abstraction by t-butoxyl radical were measured for a broad class of substrates including amines, hydrocarbons, and alcohols using laser flash photolysis. Initially, no obvious reactivity relationship between rate constant and substrate structure was observed for these homolytic reactions.

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Venham, Lanny Dean. "Kinetic studies of alpha-silyl radicals : 1) relative rates of bromination of substituted benzyltrimethylsilanes : 2) laser flash photolysis study of the absolute rates of formation of alpha-silyl radicals /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487268021746361.

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Sarkar, Sujan K. "Reaction Mechanism and Detection of Elusive C, N, and O Centered Radicals and Intermediates in Solution and Solid State." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448037904.

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Livres sur le sujet "Flash photolysis : Free radicals (Chemistry)"

Chemistry in microtime: Selected writings on flash photolysis, free radicals, and the excited state. Imperial College Press, 1997.

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J, Land E., and Truscott T. G, eds. Excited states and free radicals in biology and medicine: Contributions from flash photolysis and pulse radiolysis. Oxford University Press, 1993.

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Nicovich, John Michael. Pulsed laser photolysis kinetics study of reactions between small radical species. 1993.

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Actes de conférences sur le sujet "Flash photolysis : Free radicals (Chemistry)"

Wine, Paul H., J. M. Nicovich, Anthony J. Hynes, et al. "Laser flash photolysis studies of atmospheric free-radical chemistry using optical diagnostic techniques." In Environmental Sensing '92, edited by Harold I. Schiff and Ulrich Platt. SPIE, 1993. http://dx.doi.org/10.1117/12.140183.

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