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Letteratura scientifica selezionata sul tema "Photochemistry"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 16 novembre 2024

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Articoli di riviste sul tema "Photochemistry"

Kumpulainen, Tatu, e Alexandre Fürstenberg. "SCS Photochemistry Section Meeting Fribourg, June 14, 2019". CHIMIA International Journal for Chemistry 73, n. 10 (30 ottobre 2019): 840. http://dx.doi.org/10.2533/chimia.2019.840.

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On June 14, 2019, nearly 50 photochemists from all over Switzerland and beyond gathered together at the Haute Ecole d'Ingénierie et d'Architecture in Fribourg (HEIA-FR) for the annual SCS Photochemistry Section meeting to discuss their latest findings in the field. The organizing committee consisting of the board of the SCS Photochemistry Section put together a program consisting of 3 invited talks, 9 oral communications and a poster session with 24 posters to revive this event which, they hope, will take place annually. In addition, the general assembly of the Section was held at the premise during the day.

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Burrows, Hugh D., e Artur J. M. Valente. "Preface". Pure and Applied Chemistry 85, n. 7 (1 gennaio 2013): iv. http://dx.doi.org/10.1351/pac20138507iv.

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The XXIVth IUPAC Symposium on Photochemistry was held in the old university city of Coimbra, Portugal from 15 to 20 July 2012, and welcomed 640 participants from 53 countries presenting their research on this important area of chemistry. This series of meetings started in Strasbourg in July 1964 as the International Symposium on Organic Photochemistry, organized by George Hammond and J. Levisalles. Subsequent symposia have seen the meeting expand to embrace all areas of photochemistry. The program topics of the Coimbra symposium ranged from materials aspects of photochemistry through nanostructures and nanomaterials to mechanistic and synthetic aspects of organic photochemistry, photobiology, photomedicine and skin photochemistry, applied photochemistry, and photochemistry and cultural heritage.The symposium had 8 plenary lectures, 22 invited lectures, 105 oral communications, and more than 400 posters, confirming the vitality of this area of chemistry. It is difficult to pinpoint specific highlights, as these depend very much on one's personal interests, but one of the most important presentations was undoubtedly Tom Meyer's Porter Medal Lecture on metal-to-ligand charge-transfer states in polypyridylruthenium(II) complexes and related systems. An IUPAC Photochemistry Symposium was previously held in Portugal, in Lisbon, in 1986, and it is interesting to note that Prof. Meyer also gave a plenary lecture there addressing some of the fundamental photophysics of these systems [Pure Appl. Chem.58, 1193 (1986)]. It is refreshing to see how these have developed from pure science to practical applications.George Porter gave a plenary lecture at the Lisbon symposium in 1986 on the first nanoseconds of photosynthesis. Developments in instrumentation in the intervening 26 years now make interrogation of excited-state behavior on the femtosecond timescale relatively straightforward, and as various presentations in this volume and in the symposium demonstrate, are helping unravel the importance of early events in many photochemical and photobiological processes.In addition to the lectures and poster presentations, the program also included a number of awards for young photochemists and posters, and a variety of social activities, including canoeing on the local River Mondego.We believe that the scientific program has maintained the excellent tradition of the IUPAC Photochemistry Symposia in showing that this continues to be a vibrant, exciting interdisciplinary area of research. This issue of Pure and Applied Chemistry contains a number of the plenary and invited lectures from the symposium, which we feel mirror the current state of the art of photochemistry as a dynamic and important field of chemistry.Hugh D. BurrowsJ. Sérgio Seixas de MeloArtur J. M. ValenteConference Editors

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Liu, Wenbo, e Chao-Jun Li. "Recent Synthetic Applications of Catalyst-Free Photochemistry". Synlett 28, n. 20 (14 settembre 2017): 2714–54. http://dx.doi.org/10.1055/s-0036-1590900.

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Catalyst-free photochemistry provides numerous opportunities toward sustainable synthesis because catalyst separation can usually be avoided, which is consistent with green chemistry principles. Complementary to the well-reviewed photoredox chemistry, this review specifically summarizes the synthetic applications of photochemistry without external catalysts reported since 2000. The selected examples include both natural product synthesis and new methodology development. This review is arranged based on the type of chromophore. It is our hope that this review will inspire more synthetic chemists to embrace photochemistry into their research plans.1 Introduction2 Photochemistry of Olefins2.1 [2+2] Cycloaddition of Enones and Olefins2.2 Cycloaddition of Olefins without Carbonyl Groups2.3 Z/E Isomerization2.4 Cyclization2.5 Others3 Photochemistry of C=O3.1 The Paternò–Büchi Reaction3.2 The Yang Photoenolization3.3 The Norrish Type I Reaction3.4 The Norrish Type II Reaction3.5 Others4 Photochemistry of Nitrogen-Containing Functional Groups5 Photochemistry of Halogen-Containing Compounds6 Conclusion and Outlook

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Coyle, Emma E., e Michael Oelgemöller. "Micro-photochemistry: photochemistry in microstructured reactors. The new photochemistry of the future?" Photochemical & Photobiological Sciences 7, n. 11 (2008): 1313. http://dx.doi.org/10.1039/b808778d.

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Lemon, Christopher M. "Corrole photochemistry". Pure and Applied Chemistry 92, n. 12 (16 dicembre 2020): 1901–19. http://dx.doi.org/10.1515/pac-2020-0703.

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AbstractThe rapid expansion of photoredox catalysis and artificial photosynthesis has garnered renewed interest in the field of photochemistry. While porphyrins have been widely utilized for a variety of photochemical applications, corrole photochemistry remains underexplored, despite an exponential growth in corrole chemistry. Indeed, less than 4% of all corrole-related publications have studied the photochemistry of these molecules. Since corroles exhibit chemical properties that are distinct from porphyrins and related macrocycles, it is likely that this divergence would also be observed in their photochemical properties. This review provides a comprehensive summary of the extant corrole photochemistry literature. Corroles primarily serve as photosensitizers that transfer energy or an electron to molecular oxygen to form singlet oxygen or superoxide, respectively. While both of these reactive oxygen species can be used to drive chemical reactions, they can also be exploited for photodynamic therapy to treat cancer and other diseases. Although direct photochemical activation of metal–ligand bonds has been less explored, corroles mediate a variety of transformations, particularly oxygen atom transfer reactions. Together, these examples illustrate the diversity of corrole photochemistry and suggest that there are many additional applications yet to be discovered.

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WASHIDA, Nobuaki. "Spectroscopic Measurements in Photochemistry. X. Atmospheric Photochemistry." Journal of the Spectroscopical Society of Japan 40, n. 4 (1991): 235–46. http://dx.doi.org/10.5111/bunkou.40.235.

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García, Hermenegildo. "Preface". Pure and Applied Chemistry 77, n. 6 (1 gennaio 2005): iv. http://dx.doi.org/10.1351/pac20057706iv.

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Photochemistry is a mature science. A characteristic hallmark of a consolidated scientific discipline is that it increasingly broadens its scope of interests from an initial central core toward the periphery where it interacts with other areas. Most of the current scientific research is characterized by an enriching multidisciplinarity, focusing on topics that combine backgrounds from different fields. In this way, the largest advances are taking place at the interphase between areas where different fields meet.This multidisciplinarity is, I believe, also a characteristic feature of the current situation for photochemistry. Thus, photochemistry was initially focused on the understanding and rationalization at a molecular level of the events occurring after light absorption by simple organic compounds. Molecular organic photochemistry constituted the core of this discipline, and it largely benefited from advances in the understanding of the electronic states provided by quantum mechanics. Later, photochemistry started to grow toward areas such as photobiology, photoinduced electron transfer, supramolecular photochemistry, and photochemistry in heterogeneous media, always expanding its sphere of interest.This context of increasing diversity in topics and specialization is reflected in this issue of Pure and Applied Chemistry. The contributors correspond to some of the plenary plus two invited lectures of the XXth IUPAC Symposium that was held 17ñ22 July in Granada, Spain. The program included plenary and invited lectures and oral contributions grouped in 13 sections covering femtochemistry, photochemistry of biomacromolecules, single-molecule photochemistry, and computational methods in photochemistry to nanotechnology, among others. These workshop titles give an idea of the breadth of themes that were included in this symposium. While it is obvious that the list of contributions correspond to different subdisciplines in photochemistry, all of them have a common scientific framework to rationalize the facts.The purpose of the symposium was to present an overview of the current status of some research fronts in photochemistry. This issue begins with the 2004 Porter Medal Lecture awarded jointly by the Asian, European, and Interamerican Photochemical Societies that was given to Prof. Graham Fleming (University of California, Berkeley) for his continued advances in photosynthesis. Prof. Flemingís studies have constituted a significant contribution to the understanding of the interplay between the structure of photosynthetic centers of green plants and the mechanism of energy migration toward the photosynthetic centers. These events take place in a very short time scale and are governed by the spatial arrangement of the constituents.Continuing with photobiology, the second article by Prof. Jean Cadet (Grenoble University) describes the type of photochemical damage and photoproducts arising from DNA UV irradiation. Knowledge of these processes is important for a better understanding of skin cancer and the possibilities for DNA repair. Closely related with DNA damage occurring upon irradiation, the article by Prof. Tetsuro Majima (Osaka University) provides an account of his excellent work on photosensitized oneelectron oxidation of DNA.The concept of "conical intersection", developed initially by Robb and Bernardi to rationalize the relaxation of excited states, led to the foundation of computational photochemistry, which has proved to be of general application to photochemical reactions. In this issue, Prof. Massimo Olivucci (University of Siena) shows that quantum chemical calculations can also be applied to photochemical reactions occurring in photobiology and, in particular, to the problem of vision. These calculations are characterized by the large number of atoms that are included and the fact that they have to estimate at a high calculation level and with high accuracy the energy of states differring in a few kcal mol-1.The next article corresponds to one of the two invited lectures included in this issue. The one given by Dr. Virginie Lhiaubet-Vallet (Technical University of Valencia) in the workshop Photophysical and Photochemical Approaches in the Control of Toxic and Therapeutic Activity of Drugs describes the enantioselective quenching of chiral drug excited states by biomolecules. Moving from photobiology to free radical polymerization with application in microlithography, the article by Prof. Tito Scaiano (University of Ottawa) reports among other probes an extremely elegant approach to detect the intermediacy of radicals in photochemical reactions based on a silent fluorescent molecular probe containing a free nitroxyl radical.Solar energy storage is a recurrent topic and a long-desired application of photochemistry. In her comprehensive contribution, Prof. Ana Moore (Arizona State University) summarizes the continued seminal contribution of her group to the achievement of an efficient solar energy storage system based on the photochemical generation of long-lived charge-separated states. Another possibility of solar energy storage consists of water splitting. In his article, Prof. Haruo Inoue (Tokyo Metropolitan University) deals with artificial photosynthetic methods based on the use of ruthenium porphyrins as photosensitizers for the two-electron oxidation of water with formation of dioxygen.Also in applied photochemistry, Prof. Luisa De Cola (University of Amsterdam) reports on intramolecular energy transfer in dinuclear metal complexes having a meta-phenylene linker. The systems described by Prof. De Cola have potential application in the field of light-emitting diodes, since most of the complexes described exhibit electroluminescence. The second invited lecture is by Dr. Alberto Credi (University of Bologna), one of Europeís most promising young photochemists. In his interesting article, the operation upon light excitation of a rotaxane molecular machine is described. A macro-ring acting as electron donor moiety in a charge-transfer complex is threaded in a dumbbell-shaped component having two viologen units with different redox potential. Light absorption produces the cyclic movement of the macro-ring from one viologen station to the other.The last two contributions fall within the more classic organic photochemistry realm. Prof. Axel Griesbeck (University of Cologne) describes the multigram synthesis of antimalarial peroxides using singlet-oxygen photosensitizers adsorbed or bonded to polymer matrices. The last contribution comes from Prof. Heinz Roth (University of Rutgers), who has worked during his entire career in the fields of organic photochemistry and radical ion chemistry. Prof. Roth has summarized his vast knowledge in radical ion chemistry, reviewing the mechanism of triplet formation arising from radical ion pair recombination. This mechanism for triplet formation is currently gaining a renewed interest owing to the potential applicability to the development of phosphors.I hope that the present selection will be appealing and attractive for a broad audience of readers interested in photochemistry and will give readers an idea of the state of the art of some current topics in this area.Hermenegildo GarcíaConference Editor

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Braslavsky, S. E. "Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)". Pure and Applied Chemistry 79, n. 3 (1 gennaio 2007): 293–465. http://dx.doi.org/10.1351/pac200779030293.

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Abstract: The second edition of the Glossary of Terms Used in Photochemistry [Pure Appl. Chem.68, 2223-2286 (1996); <http://www.iupac.org/publications/pac/1996/pdf/6812x2223.pdf>] has been both corrected and updated. Terms have been added related to molecular anisotropy, the use of polarized radiation, nonlinear optical phenomena, and the emerging field of computation of excited species. Some changes have been introduced in this "Glossary" regarding the terms related to radiation energy to make this collection fully compatible with internationally agreed-upon terms. Many links are included to various Web pages listing quantities relevant to the work of photochemists and scientists using photochemical tools.

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Baeyens, Robin, Thomas Konings, Olivia Venot, Ludmila Carone e Leen Decin. "Grid of pseudo-2D chemistry models for tidally locked exoplanets – II. The role of photochemistry". Monthly Notices of the Royal Astronomical Society 512, n. 4 (26 marzo 2022): 4877–92. http://dx.doi.org/10.1093/mnras/stac809.

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ABSTRACT Photochemistry is expected to change the chemical composition of the upper atmospheres of irradiated exoplanets through the dissociation of species, such as methane and ammonia, and the association of others, such as hydrogen cyanide. Although primarily the high altitude day side should be affected by photochemistry, it is still unclear how dynamical processes transport photochemical species throughout the atmosphere, and how these chemical disequilibrium effects scale with different parameters. In this work we investigate the influence of photochemistry in a 2D context, by synthesizing a grid of photochemical models across a large range of temperatures. We find that photochemistry can strongly change the atmospheric composition, even up to depths of several bar in cool exoplanets. We further identify a sweet spot for the photochemical production of hydrogen cyanide and acetylene, two important haze precursors, between effective temperatures of 800 and 1400 K. The night sides of most cool planets (Teff < 1800 K) are shown to host photochemistry products, transported from the day side by horizontal advection. Synthetic transmission spectra are only marginally affected by photochemistry, but we suggest that observational studies probing higher altitudes, such as high-resolution spectroscopy, take photochemistry into account.

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Scandola, Franco. "Preface". Pure and Applied Chemistry 83, n. 4 (1 gennaio 2011): iv. http://dx.doi.org/10.1351/pac20118304iv.

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Latest in a long series of successful conferences, the XXIIIrd IUPAC Symposium on Photochemistry was held in Ferrara, Italy on 11-16 July 2010. The conference venues were the Opera Theatre and the Estense Castle, in the historic center of the city. The contrasting mix of modern science and ancient environment was a special trait of the Ferrara symposium.The symposium was attended by over 500 delegates (including some 130 Ph.D. students) from 40 different countries. The scientific program consisted of 8 plenary lectures, 23 invited lectures, 97 selected oral presentations, as well as 354 posters. A highlight of the symposium was the presentation of the Porter Medal to Prof. David Phillips of Imperial College London, UK, in recognition of his outstanding contributions to several fields of photochemistry. The title of his lecture was “Targeted sensitizers for photodynamic therapy”.The wide variety of fields encompassed by modern photochemistry is reflected by the list of sessions held within the symposium: Electron and Energy Transfer, Molecular Switches and Machines, Organic Photochemistry, Inorganic Photochemistry, Photochromic Systems, Solar Energy, Supramolecular Photochemistry, Nanoparticles, Photocatalysis, Ultrafast Spectroscopy, Theoretical Photochemistry, Exciton and Charge Dynamics, Microscopy, Nanoscopic Systems, Singlet Oxygen and Phototherapy, Photobiology, Fluorescent Labels, Photoactive Materials, Applied Photochemistry, and Organized Media. Most of the topics discussed were characterized by a fertile combination of fundamental insight, advanced techniques, and practical application.This issue of Pure and Applied Chemistry collects a number of papers based on plenary and invited lectures delivered at the symposium. I hope that this collection will help illustrate modern photochemistry not only as a lively and exciting research field but also as a powerful resource toward the solution of important practical problems.Franco ScandolaConference Editor

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Tesi sul tema "Photochemistry"

Bones, David Lawrence. "Liquid Aerosol Photochemistry". Thesis, University of Canterbury. Chemistry, 2008. http://hdl.handle.net/10092/1500.

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Aerosols of nitrate solutions were irradiated in the presence of radical scavengers in an attempt to measure the yield of hydroxyl radical in both the aqueous phase and the gas phase. Carbon monoxide, benzoic acid, benzene and cyclohexane were used as scavengers to trap hydroxyl radical. The products from the reaction of these scavengers with hydroxyl radical were analysed with High Performance Liquid Chromatography and mass spectrometry. The radiant flux in the chamber was measured via ferrioxalate actinometry, both with bulk liquid and aerosol droplets. Many quantitative results were obtained but several anomalies were found. This suggests that Mie theory is not capable of predicting rates of photochemical reactions within droplets.

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Firth, S. "Low temperature photochemistry". Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378979.

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Rapley, P. A. "Photochemistry of thiophthalimides". Thesis, Open University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371027.

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Niederjohann, Britta. "Photochemistry of small molecules". [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972767398.

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Karlsson, Daniel. "Photochemistry of Phenyl Halides". Doctoral thesis, Uppsala universitet, Institutionen för fotokemi och molekylärvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8602.

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We have studied fundamental aspects of photo-induced dissociation kinetics and dynamics in several phenyl halides. By combining femtosecond pump-probe measurements with ab initio calculations we are able to account for several observations. In mixed phenyl halides, the dissociation kinetics is found to be dependent on the nature, the number, and the position of the substituents, and also on the excitation wavelength. A surprisingly large reduction in the dissociation time constant, compared to that of bromobenzene (~30 ps), is observed when having two or more fluorine atoms. For example, in bromopentafluorobenzene a subpicosecond time constant is obtained. This can be explained by a significant lowering of the repulsive potential energy curves (PEC) along the C-Br bond. However, several of the experimental results cannot be accounted for by one-dimensional PECs. Therefore, we suggest a refined model for the dissociation, in which the excited states of the same spin multiplicity are coupled by employing multidimensional potential energy surfaces. This model has been explicitly evaluated by quantum dynamics simulations in the case of 3-BrFPh, and it seems to be capable of capturing the main features in the measured kinetics. Thereby we are also able to clarify the role of spin-orbit coupling in these molecules.

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Haynes, Anthony. "Intermediates in organometallic photochemistry". Thesis, University of Nottingham, 1989. http://eprints.nottingham.ac.uk/27829/.

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CHAPTER 1: A background to the techniques of matrix isolation, liquid xenon solution and flash photolysis with fast IR detection is presented. The application of infrared spectroscopy in structural studies of metal carbonyl compounds is also discussed. Chapter 2: Photolysis of((nu5-C5R5)Pt(CO))2 (R=H, Me) in frozen gas matrices results in production of ((nu5-C5R5)Pt2(mu-CO)). 13CO enrichment and polarised photochemistry show that the photoproduct contains a single symmetrically bridging CO group. Photolysis of (CpNi(mu-CO))2 in frozen gas matrices results in formation of CP2Ni2(CO) with a terminal CO ligand. The stability these dinuclear photoproducts in room temperature solution has been investigated using fast TRIR spectroscopy. Photolysis in CO matrices leads to M-M bond cleavage and reaction with CO to give Pt(CO)4 or Ni(CO)4 as the final product. CHAPTER 3: Photolysis of Os2(CO)9 or OS2(CO)8- - (mu-nu1, nu1-C2H4) in frozen gas matrices leads to formation of Os2(CO)8, which has only terminal CO groups. The thermal and photochemical reactivity of Os2(CO)a towards CO, N2 and C2H4 is investigated. Photolysis using plane polarised light provides confirmation of the C2v structure of Os2(CO)9, and gives evidence favouring a D2h structure for Os2(CO)8. Prolonged UV photolysis of Os2(CO)9 in CO matrices leads to cleavage of the Os-Os bond and production of Os(CO)5. CHAPTER 4: The mechanism of the photochemical deoligomerisation of FpSiMe2SiMe3 is investigated using a variety of techniques. The reaction is shown to proceed via two photochemical steps. Primary CO-loss is followed by intramolecular trapping to give a silyl(silylene) intermediate. The second step involves expulsion of an SiMe2 fragment and coordination of a ligand. L. to give CpFe(CO)(L)SiMe3 (L = CO, PPh3,C2H4 or N2). CHAPTER 5: A study of the photochemistry of Fp-disilyl complexes containing beta-silyl hydrogens implies beta-H transfer from Si to Fe as the dominant process following photodissociation of CO. The product, a metalladisilacyclopropane or nu2-disilene complex, is implicated as an intermediate in the photochemical formation of FpH in this system. CHAPTER 6: The experimental techniques and spectrometers used in this research are described. along with a discussion of the theory and advantages of FTIR spectroscopy.

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Banks, C. P. "Aspects of polymer photochemistry". Thesis, University of Hertfordshire, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384083.

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Sanderson, Jason Terry. "Studies in organic photochemistry". Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393200.

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McCallum, Terry. "Radical Adventures in Photochemistry". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37825.

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A field in bloom: photoredox catalysis has allowed chemists access to highly reactive intermediates via the photo-mediated excitation of transition metal complexes and organic dyes for the mild generation of free radicals. These complexes and dyes are designed based on Nature’s blueprints of light-harvesting biomolecules that transform solar energy (photons) into chemical energy during photosynthesis. Light-mediated chemical activation is regarded as one of the most sustainable forms of chemical activation being that the energy provided by the sun is considered renewable and largely underutilized and presents an attractive avenue for research and development of new transformations that are mild, efficient, and waste-limiting in organic synthesis. Radical chemistry and photochemistry are united in their inherent ability to undergo single (or photoinduced) electron transfers by one-electron reaction modes. Combining these unique fields, photoredox catalysis has emerged as a mild and efficient alternative to classic alkyl radical generation using hazardous initiators and organostannanes. Photoredox catalysis has been dominated by ruthenium- and iridium-based polypyridyl complexes. These complexes are limited by their inherent redox potentials, restricting their reactivity towards relatively activated bonds. Nonactivated bromoalkanes and arenes are considered challenging substrates to engage using redox chemistry and typically only accessible in the realm of organostannane chemistry. Described herein are the efforts towards the discovery of free radical based organic transformations derived from nonactivated bromoalkanes and arenes mediated by photochemical excitation of polynuclear gold(I) complexes as photoredox catalysts. This work represents some of the first uses of a photoredox catalyst in the reduction of substrates having such high reduction potentials and offers a practical and useful alternative to classic radical reactions mediated by initiators (peroxides, persulfates, and azo compounds) and toxic organostannanes (Bu3SnH). Using gold based photoredox catalysts, the research conducted has provided many methodological advancements for the mild and efficient formation of carbon-carbon bonds using nonactivated bromoalkanes and a large collection of radical acceptors. Establishing the use of these photoexcited polynuclear gold(I) complexes in the context of classic radical reactions in organic synthesis was important for their validation as useful photocatalysts. First, the Ueno-Stork cyclization of nonactivated bromoalkanes was used to demonstrate the powerful reducing capabilities of the excited-state gold(I) complexes. Next, a photo-mediated variant of the Appel reaction was described, where the transformation of an alcohol to a bromoalkane was achieved using carbontetrabromide and N,N-dimethylformamide through the intermediacy of a Vilsmeier-Haack reagent. In combination with the hydrodebromination chemistry developed with photoexcited polynuclear gold(I) complexes, a photo-mediated one-pot formal deoxygenation reaction of alcohols was described; a useful alternative to the organostannane mediated Barton-McCombie deoxygenation reaction. Finally, in the field of medicinal chemistry, the functionalization of heteroarenes is of high interest for the discovery of drug candidates and bioactive molecules. In this respect, one of the most useful reactions for the functionalization of heteroarenes by alkyl radicals is the Minisci reaction using silver salts, carboxylic acids, and persulfates. Detailed are the efforts for the development of a photo-mediated redox-neutral improvement of the Minisci reaction, needing only gold(I) photocatalyst and nonactivated bromoalkane in the presence of heteroarenes. Overall, the work described in this thesis represents the push for mild and efficient alternatives to the relatively harsh conditions and/or toxic reagents and byproducts associated with classic radical chemistry. These studies demonstrate the ability to control highly reactive alkyl radical intermediates with the goal of their broader application in synthetic organic chemistry. The use of photoexcited polynuclear gold(I) complexes as potent reductants compared to ruthenium- and iridium-based polypyridyl complexes is illustrated through the genesis of highly reactive alkyl radicals from nonactivated bromoalkanes.

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Sugita, Akihiro. "Multiphoton spectroscopy and photochemistry". Kyoto University, 2001. http://hdl.handle.net/2433/150656.

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Libri sul tema "Photochemistry"

Dunkin, Iain, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2007. http://dx.doi.org/10.1039/9781847558572.

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Fasani, Elisa, e Angelo Albini, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2015. http://dx.doi.org/10.1039/9781782622772.

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Albini, Angelo, e E. Fasani, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/9781849737722.

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Protti, Stefano, e Carlotta Raviola, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781839162114.

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Crespi, Stefano, e Stefano Protti, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839165269.

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Albini, Angelo. Photochemistry. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-47977-3.

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Persico, Maurizio, e Giovanni Granucci. Photochemistry. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89972-5.

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Schalk, Oliver, e Enrico Tapavicza. Photochemistry. Washington, DC, USA: American Chemical Society, 2021. http://dx.doi.org/10.1021/acs.infocus.7e4009.

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Albini, Angelo, Elisa Fasani e Stefano Protti, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781788010696.

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Albini, Angelo, e Stefano Protti, a cura di. Photochemistry. Cambridge: Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781788013598.

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Capitoli di libri sul tema "Photochemistry"

Black, John H. "Photochemistry". In Encyclopedia of Astrobiology, 1231–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1193.

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Atreya, Sushil K. "Photochemistry". In Atmospheres and Ionospheres of the Outer Planets and Their Satellites, 80–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71394-1_5.

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Kawamoto, Masuki, e Yoshihiro Ito. "Photochemistry". In Photochemistry for Biomedical Applications, 3–23. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0152-0_1.

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Black, John H. "Photochemistry". In Encyclopedia of Astrobiology, 1862–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1193.

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Carey, Francis A., e Richard J. Sundberg. "Photochemistry". In Advanced Organic Chemistry, 729–72. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-9795-3_13.

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Duffey, George H. "Photochemistry". In Modern Physical Chemistry, 509–28. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4297-1_19.

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Grossweiner, Leonard I., e Kendric C. Smith. "Photochemistry". In The Science of Photobiology, 47–78. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4615-8061-4_2.

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Black, John H. "Photochemistry". In Encyclopedia of Astrobiology, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1193-7.

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Arumainayagam, Chris. "Photochemistry". In Encyclopedia of Astrobiology, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_5610-1.

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Arumainayagam, Christopher R. "Photochemistry". In Encyclopedia of Astrobiology, 2284–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_5610.

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Atti di convegni sul tema "Photochemistry"

Koplitz, Brent D., Jeffrey L. Brum, Subhash Deshmukh, Xiaodong Xu, Zhongrui Wang e Yu-Fong Yen. "Site-specific photochemistry". In OE/LASE '92, a cura di Cheuk-Yiu Ng. SPIE, 1992. http://dx.doi.org/10.1117/12.58134.

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Ho, W. "Femtosecond surface photochemistry". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.thddd.2.

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Abstract (sommario):

The use of femtosecond lasers to study the dynamics of chemical reactions on solid surfaces is relatively new. In addition to the possibility of following reactions in real time, the high photon flux of these short laser pulses gives rise to novel reaction channels which are absent in the gas phase and with cw or nanosecond lasers.

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Weiner, Brad R., e Robert N. Rosenfeld. "Photochemistry of formyl fluoride". In ADVANCES IN LASER SCIENCE−IV. AIP, 1989. http://dx.doi.org/10.1063/1.38597.

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White, J. M. "Photochemistry at Metal Surfaces". In The Microphysics of Surfaces: Beam-Induced Processes. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/msbip.1991.mc1.

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Recently, photon-driven processes at adsorbate substrate interfaces has received considerable attention in the research community and for both fundamental and practical reasons. Among the most recent avenues being pursued is photochemistry at adsorbate-metal interfaces where bond breaking within the adsorbate, surface rearrangement, reaction with coadsorbates, and adsorbate desorption have all been observed in systems where thermal effects can be ruled out. Thus, the quenching of electronically excited states by metallic substrates does not always overwhelm, bond breaking processes.

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Schwoerer, Heinrich, Karel von Eschwege, Gurthwin Bosman, Patrizia Krok e Jeanet Conradie. "Ultrafast Photochemistry of Mercury Dithizonates". In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/up.2010.the9.

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Artemyev, Mikhail V., Sergey V. Gaponenko, I. N. Germanenko e A. M. Kapitonov. "Selective photochemistry of quantum dots". In International Conference on Coherent and Nonlinear Optics, a cura di Victor N. Zadkov. SPIE, 1996. http://dx.doi.org/10.1117/12.242155.

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Syage, Jack A. "Picosecond photochemistry in molecular clusters". In OE/LASE '90, 14-19 Jan., Los Angeles, CA, a cura di Keith A. Nelson. SPIE, 1990. http://dx.doi.org/10.1117/12.17891.

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Chen, J. S. Y., T. G. Euser, N. J. Farrer, P. J. Sadler e P. St J. Russell. "Photochemistry in photonic crystal fibers". In 11th European Quantum Electronics Conference (CLEO/EQEC). IEEE, 2009. http://dx.doi.org/10.1109/cleoe-eqec.2009.5196326.

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Harrison, Ian A., Vladimir A. Ukraintsev e Alexander N. Artsyukhovich. "Oxygen photochemistry on Pt(111)". In OE/LASE '94, a cura di Hai-Lung Dai e Steven J. Sibener. SPIE, 1994. http://dx.doi.org/10.1117/12.180853.

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Arnaut, Luis G. "Photosensitizers and photochemistry (Conference Presentation)". In 17th International Photodynamic Association World Congress, a cura di Tayyaba Hasan. SPIE, 2019. http://dx.doi.org/10.1117/12.2536227.

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Rapporti di organizzazioni sul tema "Photochemistry"

Eisenthal, Kenneth B. Photochemistry at Interfaces. Office of Scientific and Technical Information (OSTI), febbraio 2015. http://dx.doi.org/10.2172/1170586.

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Wittig, Curt, e Hanna Reisler. Informal Photochemistry Conference (XVIIIth). Fort Belvoir, VA: Defense Technical Information Center, febbraio 1990. http://dx.doi.org/10.21236/ada219779.

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Tollin, G. Chlorophyll photochemistry in microheterogeneous media. Office of Scientific and Technical Information (OSTI), dicembre 1989. http://dx.doi.org/10.2172/7152223.

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Schmidt, R., G. Overturf, B. Watkins e L. Fried. Toward Unraveling the Photochemistry of TATB. Office of Scientific and Technical Information (OSTI), novembre 1999. http://dx.doi.org/10.2172/792425.

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Zafiriou, Oliver C. Oxidation-Reduction Photochemistry in Marine Systems. Fort Belvoir, VA: Defense Technical Information Center, marzo 1997. http://dx.doi.org/10.21236/ada324011.

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Ludowise, P. D. Ultrafast measurements of chlorine dioxide photochemistry. Office of Scientific and Technical Information (OSTI), agosto 1997. http://dx.doi.org/10.2172/658167.

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Shi, Yun-bo. Photochemistry of psoralen-DNA adducts, biological effects of psoralen-DNA adducts, applications of psoralen-DNA photochemistry. Office of Scientific and Technical Information (OSTI), marzo 1988. http://dx.doi.org/10.2172/5069947.

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Castellano, Felix. LOW POWER UPCONVERSION FOR SOLAR FUELS PHOTOCHEMISTRY. Office of Scientific and Technical Information (OSTI), agosto 2013. http://dx.doi.org/10.2172/1089302.

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Rosenberg, R. A., J. K. Simons e S. P. Frigo. Site-specific, synchrotron radiation induced surface photochemistry. Office of Scientific and Technical Information (OSTI), dicembre 1995. http://dx.doi.org/10.2172/195701.

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Davis, H. Floyd. Reaction dynamics and photochemistry of divalent systems. Office of Scientific and Technical Information (OSTI), maggio 1992. http://dx.doi.org/10.2172/10181507.

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