Excited-State Dynamics of Monomeric and Aggregated Carotenoid 8 '-Apo-beta-carotenal

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F12%3A43884197" target="_blank" >RIV/60076658:12310/12:43884197 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/jp310140k" target="_blank" >http://dx.doi.org/10.1021/jp310140k</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/jp310140k" target="_blank" >10.1021/jp310140k</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Excited-State Dynamics of Monomeric and Aggregated Carotenoid 8 '-Apo-beta-carotenal

Popis výsledku v původním jazyce

Excited-state properties of monomeric and aggregated carbonyl carotenoid 8'-apo-beta-carotenal were studied by means of femtosecond transient absorption spectroscopy. For monomers, the polarity-dependent behavior characteristic of carotenoids with conjugated carbonyl group was observed. In n-hexane the S, lifetime is 25 ps, but it is shortened to 8 ps in methanol. This shortening is accompanied by the appearance of new spectral bands in transient absorption spectrum. On the basis of analysis of the transient absorption spectra of monomeric 8'-apo-beta-carotenal in n-hexane and methanol, we propose that the polarity-induced spectral bands are due to the S-1(A(g)(-))-S-3(A(g)(+)) transition, which is enhanced upon breaking the symmetry of the molecule. This symmetry breaking is caused by the conjugated carbonyl group; it is much stronger in polar solvents where the S, state gains significant charge-transfer character. Upon addition of water to methanol solution of 8'-apo-beta-carotenal w

Název v anglickém jazyce

Excited-State Dynamics of Monomeric and Aggregated Carotenoid 8 '-Apo-beta-carotenal

Popis výsledku anglicky

Excited-state properties of monomeric and aggregated carbonyl carotenoid 8'-apo-beta-carotenal were studied by means of femtosecond transient absorption spectroscopy. For monomers, the polarity-dependent behavior characteristic of carotenoids with conjugated carbonyl group was observed. In n-hexane the S, lifetime is 25 ps, but it is shortened to 8 ps in methanol. This shortening is accompanied by the appearance of new spectral bands in transient absorption spectrum. On the basis of analysis of the transient absorption spectra of monomeric 8'-apo-beta-carotenal in n-hexane and methanol, we propose that the polarity-induced spectral bands are due to the S-1(A(g)(-))-S-3(A(g)(+)) transition, which is enhanced upon breaking the symmetry of the molecule. This symmetry breaking is caused by the conjugated carbonyl group; it is much stronger in polar solvents where the S, state gains significant charge-transfer character. Upon addition of water to methanol solution of 8'-apo-beta-carotenal w

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BO - Biofyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GA202%2F09%2F1330" target="_blank" >GA202/09/1330: Excitované stavy karotenoidových agregátů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry A

ISSN

1089-5639

e-ISSN

—

Svazek periodika

116

Číslo periodika v rámci svazku

50

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

12330-12338

Kód UT WoS článku

000312519800015

EID výsledku v databázi Scopus

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