Equilibration Dependence of Fucoxanthin S-1 and ICT Signatures on Polarity, Proticity, and Temperature by Multipulse Femtosecond Absorption Spectroscopy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897245" target="_blank" >RIV/60076658:12310/18:43897245 - isvavai.cz</a>

Alternative codes found

RIV/60077344:_____/18:00495163

Result on the web

<a href="https://pubs.acs.org/doi/pdf/10.1021/acs.jpcb.8b04217" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acs.jpcb.8b04217</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcb.8b04217" target="_blank" >10.1021/acs.jpcb.8b04217</a>

Result language

angličtina

Original language name

Equilibration Dependence of Fucoxanthin S-1 and ICT Signatures on Polarity, Proticity, and Temperature by Multipulse Femtosecond Absorption Spectroscopy

Original language description

To demonstrate the value of the multipulse method in revealing the nature of coupling between excited states and explore the environmental dependencies of lowest excited singlet state (S-1) and intramolecular charge transfer (ICT) state equilibration, we performed ultrafast transient absorption pump-dump-probe and pump-repump -probe spectroscopies on fucoxanthin in various solvent conditions. The effects of polarity, proticity, and temperature were tested in solvents methanol at 293 and 190 K, acetonitrile, and isopropanol. We show that manipulation of the kinetic traces can produce one trace reflecting the equilibration kinetics of the states, which reveals that lower polarity, proticity, and temperature delay S-1/ICT equilibration. On the basis of a two-state model representing the S-1 and ICT states on the same S-1/ICT potential energy surface, we were able to show that the kinetics are strictly dependent on the initial relative populations of the states as well as the decay of the ICT state to the ground state. Informed by global analysis, a systematic method for target analysis based on this model allowed us to quantify the population transfer rates throughout the life of the S-1/ICT state as well as separate the S-1 and ICT spectral signatures. The results are consistent with the concept that the S-1 and ICT states are part of one potential energy surface.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA16-10417S" target="_blank" >GA16-10417S: Carotenoids in light-harvesting and photoprotection – new approaches using multipulse femtosecond spectroscopy</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physical Chemistry B

ISSN

1520-6106

e-ISSN

—

Volume of the periodical

122

Issue of the periodical within the volume

29

Country of publishing house

US - UNITED STATES

Number of pages

13

Pages from-to

7264-7276

UT code for WoS article

000440519900007

EID of the result in the Scopus database

2-s2.0-85049644861