Original title: Tuning carotenoid photophysics by changes in structure and local environment
Authors: ÖZCAN, Emrah
Document type: Doctoral theses
Year: 2024
Language: eng
Abstract: This thesis investigates the complex dynamics of excited states in carotenoids, focusing on the origins and properties of certain dark states and how they are affected by external disturbances such as metal interactions, pH changes, applied voltage, and chemical modifications. Paper I demonstrates the creation of stable astaxanthin-metal complexes and their altered excited-state dynamics, revealing shortened lifetimes and enhanced ICT bands due to metal-ion interactions. Paper II explores the effect of external voltage on 8-apo--carotenal, showing that applied voltage can control the ICT state amplitude and extend its lifetime. Paper III examines pH-dependent effects on crocin, finding significant pH-induced shifts and stabilization at basic pH levels. Paper IV presents the synthesis and analysis of bis-phenylhydrazone astaxanthin, highlighting its modified excited-state dynamics and the potential for organic modification to study new effects. These findings enhance our understanding of carotenoid excited states and suggest new research approaches.
Keywords: 8'-apo--carotenal; Carotenoids; Charge transfer state; Crocin; Cyclic voltammetry; Metal complexes; pH-dependence.; Spectroelectrochemistry; Ultrafast spectroscopy
Citation: ÖZCAN, Emrah. Tuning carotenoid photophysics by changes in structure and local environment. České Budějovice, 2024. disertační práce (Ph.D.). JIHOČESKÁ UNIVERZITA V ČESKÝCH BUDĚJOVICÍCH. Přírodovědecká fakulta

Institution: University of South Bohemia in České Budějovice (web)
Document availability information: Fulltext is available in the Digital Repository of University of South Bohemia.
Original record: http://www.jcu.cz/vskp/63207

Permalink: http://www.nusl.cz/ntk/nusl-651524


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Universities and colleges > Public universities > University of South Bohemia in České Budějovice
Academic theses (ETDs) > Doctoral theses