Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Photoreaction."”.
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FTIR study of carboxylic acids and tyrosines in bacteriorhodopsin
… (bR) were obtained in order to study its photoreaction at the molecular level. The noise level was near 10-5 in the spectral regions where amino acid residues are monitored. The excellent signal to noise ratio allowed detection of absorption changes of single amino acids during the …
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Some Mechanistic Studies of Organotellurium Chemistry
… in solution cantaining alcohol is described. The photoreaction was found to proceed under aerobic conditions via the breaking of the tellurium-tellurium bond, and the production of a free radical species is reported. The final product obtained from the photoreaction, an bis(aryltellurenyl) oxide, …
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Unraveling the mechanism of the lightstruck flavor of beer
… characterization and identification of prevalent photoreaction products by comprehensive product analysis, relevant reaction schemes were elaborated to account for formation of key compounds. In a first section, a detailed study of the photolability of isohumulones, dihydroisohumulones, and …
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Photoinitiated coupling of dienes and monoolefins with pentacarbonyliron
The photoreaction of pentacarbonyliron with 1,3-diene/monoolefin mixtures results in C-C coupling of the two organic substrates, forming a six-carbon chain which is coordinated to the Fe (CO) 3 moiety in a 1-a,4-6-n3 fashion. Using various 1,3- dienes and monoolefins carrying methyl and carboalkoxy …
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The mechanism of an unusual benzo/benzo photocycloaddition reaction : photophysical and photochemical investigation of [3.3] orthocyclophanes with two face-to-face preoriented benzenoid chromophores
… generated, the „scope and limitation“ of this photoreaction (= PR) was of utmost importance. Even though limited functionalization is tolerated, minor skeletal changes have severe consequences. This structural dependency asked for a detailed photomechanistic study, the more so, since B/B …
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Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly
… In this thesis, I describe both a secondary photoreaction that this ligand is capable post-photocleavage, which removes the ligand's ability to bind to negatively charged gold nanospheres, allowing for, among other assembly methods, reverse photopatterning. I further show that this …
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Ultrafast reaction dynamics of polyatomic molecules probed by ionization
… probe step. Concerning the 1,3,5-cyclooctatriene photoreaction, there are strong arguments for the participation of two different reaction channels (involving a 3-center and a 4-center substructure) which lead to three products. Studying the ring-opening reaction of 7-dehydrocholesterol, which is …
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Photochemistry of cyclopentadienyliron(II) arene complexes and tetraorganoborate salts
… $\eta\sp4$-arene-Cp-iron compound. Also, the photoreaction of (CpFe(ArH)) $\sp{+}$X$\sp{-}$ in solutions containing epoxides was investigated.
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Some aspects of quinonoid chemistry
… With t - butylamino - benzoquinone no photoreaction was observed.
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Monitoring Photocatalytic Degradation of X-ray Contrast Media with Raman Spectroscopy
… were monitored for eight hours. Evidence of photoreaction is observed, indicating that the degradation of X-ray contrast media can be measured using Raman spectra. To our knowledge, this represents the first use of Raman spectroscopy to monitor photocatalytic degradation in real time, opening …
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Femtosekunden-Spektroskopie biologischer Systeme mittels kohärenter Kontrolle
… on concepts of coherent control. By initiating a photoreaction with femtosecond pulses whose temporal phase and amplitude are shaped in such a manner that specific molecular vibrations and states are addressed, the energy flow can be steered at will. The comparison between the ensuing energy flow …
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Kinetics of gelation in photoreversible gels
… gelation process can be considered to consist of photoreaction, micelle formation, and possibly polymer relaxation. It was found that the photon flux through the material limits the rate of reaction, which then controls the remaining processes in the system. The photoreaction was studied under …
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Molecular dynamics studies of membranes and membrane proteins
… interaction in controlling the initial photoreaction and revealed an important role of internal water molecules for the function of bacteriorhodopsin. (2) A dilaurylphosphatidylethanolamine membrane bilayer solvated in excess water: Structural properties of the membrane, electrostatic …
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Development of a new actinometric method for polychromatic light irradiation. Application to photochromes, drugs and stilbenoids
… regarding parameter representation of the photoreaction and the reproducibility of associated results. The other models available in the literature use approximation and expansion methods to solve the photochemical rate law but are unfortunately unable to provide robust models to describe …
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Crosstalk of protein phosphorylation and lysine acetylation on 14-3-3 proteins and their applications in brassinosteroid signaling and photosynthesis
… (RbCL and RbCS), subunits of PSII and PSI photoreaction centers, the ATP synthase beta subunit, and glyceraldehyde 3-phosphate dehydrogenase. We demonstrated that lysine acetylation of LHCb1 was correlated with its localization in relation to PSII photoreaction center; acetylation of RbCL …
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A 'Toolkit' of Small Molecules for Polymer Assembly and Post-Synthetic Modification Using 'Click' and Photoactive Chemistries
… Chapter 4 is an inquiry into the nature of the photoreaction of a standard photoactive moiety - benzophenone - with model compounds that represent polymers in which the crosslinkers of Chapter 2 are embedded. Comparison of competitive rates of abstraction gives insight into the reactive …
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Functional Nanomaterials From Bis-Urea Macrocycles
… These guests usually undergo non selective photoreaction in solid-state with very low percent conversion and produce different photodimers and/or isomers. Within our molecular container, a number of guests showed photo-dimerization with amazing selectivity and enhanced conversion in the …
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Leveraging the Photochemistry of N-Nitrosamines for Their Aqueous Detection, and Development of a Novel Hemi-Iptycene for Porous Polymers
… indicator is described. The initial photoreaction yields an ortho-naphthoquinone-oxime, and the colorimetric response is enhanced by the formation of an intensely green iron(II) complex. The sensitivity and selectivity of the resulting solution-phase assay are evaluated, and efforts …
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PHOTOCHEMICAL AND TITANIUM (II) MEDIATED METHODS FOR THE SYNTHESIS OF COMPLEX MOLECULAR SCAFFOLDS
… cyclic ketones. Intramolecular [4 + 4] photoreaction of 2-pyridones with silyl 3-enol-1-ynes yields a highly reactive 1,2,5-cyclooctatriene. In the presence of a silanol proton source the allene is converted into a 1,3-diene. Without the combination of silyl 3-enol-1-ynes and silanol, as …
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