Ultrafast dynamics of hydrophilic carbonyl carotenoids - Relation between structure and excited-state properties in polar solvents

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12640%2F10%3A00012163" target="_blank" >RIV/60076658:12640/10:00012163 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60077344:_____/10:00355284

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Ultrafast dynamics of hydrophilic carbonyl carotenoids - Relation between structure and excited-state properties in polar solvents

Popis výsledku v původním jazyce

We present a study of excited-state dynamics of water-soluble carbonyl carotenoids, crocin, norbixin, and astalysine in solvents with different polarity. While no polarity effects were observed in 2-propanol and methanol, polarity-induced lifetime shortening has been detected in water. For crocin and astalysine the S-1 lifetime decreases from 135 ps to 61 ps (crocin), and from 4 ps to 2.2 ps (astalysine) when going from methanol to water. The S-1 lifetime of norbixin is within the 15-18 ps range in allsolvents, an effect attributed to its carboxylic group, which isolates the carbonyl group from the rest of conjugation. No spectral bands attributable to the intramolecular charge transfer (ICT) state have been found in any transient absorption spectra.The ICT-S-n transition is made forbidden, we suggest, by the symmetric location of the conjugated carbonyl groups. In astalysine, we have found a clear signature of the S* state with a life-time of 7 ps (methanol) and 6.1 ps (water).

Název v anglickém jazyce

Ultrafast dynamics of hydrophilic carbonyl carotenoids - Relation between structure and excited-state properties in polar solvents

Popis výsledku anglicky

We present a study of excited-state dynamics of water-soluble carbonyl carotenoids, crocin, norbixin, and astalysine in solvents with different polarity. While no polarity effects were observed in 2-propanol and methanol, polarity-induced lifetime shortening has been detected in water. For crocin and astalysine the S-1 lifetime decreases from 135 ps to 61 ps (crocin), and from 4 ps to 2.2 ps (astalysine) when going from methanol to water. The S-1 lifetime of norbixin is within the 15-18 ps range in allsolvents, an effect attributed to its carboxylic group, which isolates the carbonyl group from the rest of conjugation. No spectral bands attributable to the intramolecular charge transfer (ICT) state have been found in any transient absorption spectra.The ICT-S-n transition is made forbidden, we suggest, by the symmetric location of the conjugated carbonyl groups. In astalysine, we have found a clear signature of the S* state with a life-time of 7 ps (methanol) and 6.1 ps (water).

Druh

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

CEP obor

BO - Biofyzika

OECD FORD obor

—

Projekt

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

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název periodika

Chemical Physics

ISSN

0301-0104

e-ISSN

—

Svazek periodika

373

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000280065100010

EID výsledku v databázi Scopus

—