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Showing 1 to 13 of 13 for “"Photoisomerisation"”.
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Self-Assembly of Azobenzene Photosurfactants and the Relationship with Macroscopic Properties
… to self-organise into polymolecular assemblies. Photoisomerisation changes the polarity and shape of the surfactant on demand, which has led to the exploration of these materials in a diverse range of applications. The interplay between these properties also affects the concentration-dependent …
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Thiophene-based photoresponsive mesogens
… studies on Series I show that trans-cis photoisomerisation may be induced at 367 nm, with the reverse cis-trans isomerisation process occurring 434 nm.
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Spectroscopy, Electrochemistry and Photochemistry of Phenylazonaphthalene Dyes
… bond scission. The R-Span dyes show trans to cis photoisomerisation, and NH2-, OH-, OMe- and NHAc-Span showed complete cis to trans thermal back reactions within ca. 30 ms, 35 μs, 11 days and 1 day, respectively.
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Synthesis of Novel CYP1 Activated Heterocyclic Anticancer Prodrugs
… anti-cancer prodrug activity, but are labile to photoisomerisation reactions converting the potent trans isomer to the less toxic cis isomer. Several heterocyclic ring systems were incorporated across the α,β-unsaturated moiety of the chalcones to produce rigid structures, eliminating the …
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Chemistry of hydroxycinnamate esters and their role as precursors to Dekkera produced off-flavour in wine.
… chemical transformations. It was found that photoisomerisation of the glucose esters could be prevented via synthesis under red light, which gave trans-9 and 10, however migration of the hydroxycinnamoyl moiety around the glucose ring, which yielded mainly the 2-O-α- and 6-O-α-esters, was a …
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Towards sustainable heterogenous catalysis in molecular solar thermal energy storage (MOST) systems
… interfere but actually promotes the chemical photoisomerisation and catalytic reactions of the NBD/QC photoswitch. In the sixth chapter, a host of NBD/QC photoswitches will be synthesized and tested in conjunction with a previously confirmed active heterogenous catalyst. The aim was to …
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Cyclodextrin-based rotaxanes for material science applications
… reported rotaxane 1.34 were prepared and their photoisomerisation and decomposition behaviour in comparison to the corresponding dumbbells 1.37 and 1.38 were examined in Chapters 6 and 7. UV/visible spectroscopy and HPLC analysis illustrated that the profluorescent probes of the dumbbells 1.37 …
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Cyclodextrin-based rotaxanes for material science applications
… reported rotaxane 1.34 were prepared and their photoisomerisation and decomposition behaviour in comparison to the corresponding dumbbells 1.37 and 1.38 were examined in Chapters 6 and 7. UV/visible spectroscopy and HPLC analysis illustrated that the profluorescent probes of the dumbbells 1.37 …
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The Design, Preparation and Characterisation of Light-Responsive Pickering Emulsions
… analysis, before and after <i>trans-cis</i> photoisomerisation. It is found that the length of the carbon spacer is the most important factor in controlling particle hydrophobicity and the azobenzene-modified particles show a greater difference in hydrophobicity when isomerised compared to the …
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FTIR Spectroscopy of the photophobic sensory rhodopsin II/transducer complex from natronabacterium pharaonis
… durch einfallendes Licht angeregt, erfolgt eine Photoisomerisation des Retinals von der all-trans zur 13-cis Konfiguration, welche Konformationsänderungen hervorruft, die wiederum die entsprechenden Transducerproteine aktivieren. <br>In der vorliegenden Arbeit wird die FTIR Spektroskopie als …
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Neue organometallisch substituierte Alkine, Alkene und Metallacyclen - Anwendung der Multikern-NMR-Spektroskopie
… zu ihren Silol-Analoga, beständig gegen Photoisomerisation. In allen anderen Fällen reagieren Dialkinylstanne mit B(C6F5)3 unter der quantitativen Bildung von 1,4-Stanna-bora-cyclohexa-2,5-dienen, wobei eines mittels Röntgenkristallstrukturanalyse charakterisiert werden konnte. Die …
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The use of enzymes, isomerisable lipid analogues and small molecules to modulate the structure and dynamics of lipid bilayer
… kinase (DGK) in order to assess the effect of photoisomerisation of the azobenzene group on the activity of the protein. The increase in volume of bis-Azo-PC in the cis state should have a significant effect on protein activity as bilayer tension increases. Protein activity was measured using …
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Femtosecond quantum control and adaptive polarization pulse shaping
Adaptive Femtosekunden-Quantenkontrolle hat sich in den letzten Jahren als eine sehr erfolgreiche Methode in vielen wissenschaftlichen Gebieten wie Physik, Chemie oder Biologie erwiesen. Eine Vielzahl von Quantensystemen und insbesondere Moleküle, die eine chemische Reaktion durchlaufen, sind durch …