Název: Tuning carotenoid photophysics by changes in structure and local environment
Autoři: ÖZCAN, Emrah
Typ dokumentu: Disertační práce
Rok: 2024
Jazyk: eng
Abstrakt: 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.
Klíčová slova: 8'-apo--carotenal; Carotenoids; Charge transfer state; Crocin; Cyclic voltammetry; Metal complexes; pH-dependence.; Spectroelectrochemistry; Ultrafast spectroscopy
Citace: 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

Instituce: Jihočeská univerzita v Českých Budějovicích (web)
Informace o dostupnosti dokumentu: Plný text je dostupný v digitálním repozitáři JČU.
Původní záznam: http://www.jcu.cz/vskp/63207

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-651524