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Wavelength-Orthogonal Approaches Enabling Reprogrammable Gradient Materials

Marschner, David Emmanuel

Abstract (englisch):
The reversible and visible light induced cycloaddition of styrylpyrene has been investigated with regard to its formed isomeric photoproducts as well as its most efficient photochemical reaction conditions – i.e. trigger wavelength and number of photons required for maximum conversion – via a newly developed technique called Wavelength-dependent Photon Efficiency Analysis (WPEA). With wavelengths at 435 nm for the dimerisation and 330 nm for the dissociation, the investigated cycloaddition is among the mildest of its kind. The chromophore was further exploited in polymer studies, on the one hand towards wavelength-orthogonal reaction systems to alter material properties simply by using disparate colours of light, and on the other hand for reprogrammable gradient materials. In particular, styrylpyrene has been successfully employed in reversible block-copolymer formations over several dimerisation / dissociation cycles demonstrating the capability of styrylpyrene for reprogrammability. A further reversible visible light moiety based on a pyrenyl cinnamic acid derivate was combined with o-methyl benzaldehyde – which reacts in an irreversible cycloaddition under irradiation with UV light – in one molecule. ... mehr

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Volltext §
DOI: 10.5445/IR/1000098436
Veröffentlicht am 26.09.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Hochschulschrift
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000098436
Verlag Karlsruhe
Umfang VIII, 218 S.
Abschlussart Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Technische Chemie und Polymerchemie (ITCP)
Prüfungsdatum 25.07.2019
Referent/Betreuer Prof. C. Barner-Kowollik
Schlagworte photochemistry, cycloaddition, visible light, reversible, styrylpyrene
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