Effect of Isomerization on Excited-State Dynamics of Carotenoid Fucoxanthin

Valentyna Kuznetsova, Pavel Chábera, Radek Litvín, Tomáš Polívka, Marcel Fuciman

Research output: Contribution to journalArticlepeer-review

Abstract

Ultrafast transient absorption spectroscopy and single-wavelength anisotropy measurements were used to study the effect of isomerization on the excited-state properties of fucoxanthin in polar and nonpolar solvents. The excitation wavelengths were 477 nm for all-trans-fucoxanthin, and 333 and 477 nm for cis-fucoxanthin. All transient absorption spectra of the fucoxanthin isomers in polar solvents show intramolecular charge transfer (ICT) state features, typical for carbonyl carotenoids. Global analysis of the data requires an additional fitting component, originated from the presence of blue and red forms of fucoxanthin in a polar protic solvent. Here we demonstrate that the ICT state decays faster than the S1 state, due to the significant contribution of the red form to the ICT state dynamics. The isomerization does not affect the S1 lifetime, but induces a larger difference between the S1- and ICT-state lifetimes in cis-fucoxanthin, which is likely caused by alterations of ICT coupling to either the S1 or S0 states; the S∗-state signal is more pronounced for cis-isomers in a nonpolar solvent.

Original languageEnglish
Pages (from-to)4438-4447
Number of pages10
JournalJournal of Physical Chemistry B
Volume121
Issue number17
DOIs
Publication statusPublished - 2017 May 4

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

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