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Showing 1 to 20 of 56 for “"PHOTOCHEMICAL REACTIONS"”.
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Subwavelength nanostructures for optical biosensing and rapid photochemical reactions
… enhanced photon absorption for photocatalytic reactions has been demonstrated. Photocatalytic metal nanoparticle synthesis is of significant interest in plasmonic biosening due to the simple fabrication capability. However, long synthesis time of more than 10 hours and the use of particle …
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Femtosecond through nanosecond investigations of liquid state photochemical reactions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Competing reaction pathways in the photochemical reactions of metal carbonyl compounds
The photochemical reaction of Mn$\sb2$(CO)$\sb{10}$ with HSnBu$\sb3$ has been studied by continuous photolysis. Sunlamp irradiation of a CO-saturated hexane solution of Mn$\sb2$(CO)$\sb{10}$ and HSnBu$\sb3$ results in formation of HMn(CO)$\sb5$ and Bu$\sb3$SnMn(CO)$\sb5$ in equimolar quantities. …
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Investigation of nitroxide-mediated thermal and photochemical reactions of living free radical polymerization.
… of this process have been studied; thermal and photochemical reaction sequences. Stoichiometric unimolecular initiators were found to be ideal probes for studying the reactions involved in the LFRP process. The bond dissociation energy (BDE) of the labile C-O bond of the alkoxyamine initiators …
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Thermal and photochemical reactions of large metallaborane clusters and functionalizations of boron nitride nanosheets
<p>The thermal and photochemical pathways of several metallaborane compounds and the functionalization of boron nitride nanosheets have been investigated. The nanosheets have potential applications in Dye Sensitized Solar Cells.Chapters 1 and 3 describe the thermal and photochemical pathways for …
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Photochemical reactions of tetraorganoborate salts: Electron transfer-mediated photoreductions and alkylations and di-pi-borate rearrangements
The photochemical reaction of sodium borohydride and methyltriphenylborate with halo-substituted cyanonaphthalenes has been studied. The reaction leads to photo-dehalogenation in high yield. Sodium borohydride was also found to react photochemically with dicyanonaphthalene, leading to reduction …
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The Photochemical Reactions of Dirhenium Decacarbonyl With Water and of Dinuclear Rhenium Carbonyl Complexes Substituted by Nitrogen Bases
… are also detected but are formed through side reactions of HRe(CO)(,5). Eq-Re(,2)(CO)(,9)(OH(,2)) is produced selectively under 313 nm irradiation; quantum yield measurements at this wavelength indicate that formation of the aqua complex proceeds through dissociative substitution of H(,2)O for …
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Tddft Derivative Couplings And Other Topics In Quantum Chemistry
Photochemical reactions, which involve both the ground and excited electronic states of a molecule, can promote processes otherwise inaccessible by normal reactions. In general, photochemical reactions may be classified as adiabatic or nonadiabatic depending on whether the reaction takes place on …
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Mass-independent sulfur isotope fractionation during photochemistry of sulfur dioxide
… the multiple sulfur isotope systematics during photochemical reactions of sulfur dioxide as a function of a variety of experimental conditions. Two absorption regions of SO2 are tested - photolysis in the 190 to 220 nm region and photoexcitation in the 250 to 350 nm region. Experimental …
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Characterization of biological chromophores using fast electrophoretic analyses and multiphoton-exited fluorescence
… including investigations of enzymatic reactions with fast chemical kinetics, analysis of transient photochemical reactions, and probing neurotransmitter secretion. In this dissertation work, multiphoton excitation (MPE), a high sensitivity detection approach, and capillary …
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SYNTHETIC AND MECHANISTIC PHOTOCHEMISTRY OF ALKOXY ANTHRAQUINONES: POTENTIAL UTILITY IN DRUG DELIVERY AND SYNTHETIC METHODOLOGIES
… delves into the mechanistic details of the photochemical reactions of alkoxy-anthraquinones in various media in order to devise potential applications of these photoreactions. Currently, Photodynamic therapy relies on the generation of singlet oxygen in cells which is not efficient under …
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Picosecond Studies of Unimolecular Reactions
Several photochemical reactions occur on a very fast timescale. These ultrafast reactions may best be studied by the use of picosecond spectroscopy. These studies require advanced instrumental and data acquisition techniques. The construction of an apparatus which allows resolution of events on the …
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Photochemical transformations of α-diazocarbonyl compounds in flow
… under continuous flow photolysis. These photochemical transformations yielded 2,3-dihydrobenzofurans, γ- and β-lactones, oxazoles and Wolff rearrangement products indicating the synthetic versatility of these metal-free processes. Continuous flow technology was also applied to telescope …
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Monoaromatic hydrocarbons and aldehydes in Las Vegas air
… were used to infer the occurrence of photochemical reactions in atmosphere. There are significant negative correlations between CO normalized concentrations of monoaromatic hydrocarbons and aldehydes, between monoaromatic hydrocarbons and ozone, and significant positive correlation …
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Reactions of graphene oxide and buckminsterfullerene in the aquatic environment
… damage by GO within biological cells. Indirect photochemical reactions involving GO were shown to occur in an experiment in which hydroxyl radicals were generated by the photodecay of hydrogen peroxide. GO was oxidized by ˙OH within a 48 hr irradiation period, as measured by changes in the …
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Beschreibung angeregter Molekülzustände in komplex strukturierter Umgebung durch einen effizienten, individuell selektierenden MRCI-Algorithmus gekoppelt an ein molekularmechanisches Kraftfeld
… such techniques to enable the description of photochemical reactions and to carry out case studies subsequently. In order to tackle the enormous computational demand due to the involvement of excited electronic states, we (i) largely speed up the individually selecting multi-refernce …
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SYNTHESIS OF NATURAL PRODUCT NEPETANUDONE THROUGH THERMALLY FORBIDDEN [4Π+4Π] CYCLOADDITION IN THE PRESENCE OF LIGHT
… been proved or proposed to involve a number of photochemical reactions like photocyclizations, Norrish type reactions, photochemical rearrangements, reactions via dienol intermediates, Paterno-Buchi reaction, photodimerization, photo-claisen rearrangement etc [1]. These reactions have been used …
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A Model for the Chloroplast: A Study of the Photochemical and Spectral Properties of Pheophytin A Adsorbed to the Surface of Small Particles
… in influencing the nature and efficiency of the photochemical electron-transfer reactions of chlorophyll. This research has involved the study of a simple model for the chloroplast with the purpose of gaining some insight into this problem. It is known that chlorophyll and related molecules will …
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Molecular Dynamics Simulation Studies on Interfacial Dynamics of Proteins
… flow channels that may mediate the kinetics of photochemical reactions such as charge transfer and conformational isomerization.
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