Počet záznamů: 1

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

SYSNO ASEP	0355284
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Ultrafast dynamics of hydrophilic carbonyl carotenoids - Relation between structure and excited-state properties in polar solvents
Tvůrce(i)	Chábera, P. (CZ) Fuciman, M. (CZ) Naqvi, K.R. (NO) Polívka, Tomáš (BC-A)_{RID, ORCID}
Zdroj.dok.	Chemical Physics. - : Elsevier - ISSN 0301-0104 Roč. 373, 1-2 (2010), s. 56-64
Poč.str.	9 s.
Jazyk dok.	eng - angličtina
Země vyd.	NL - Nizozemsko
Klíč. slova	hydrophilic carotenoids ; excited-state dynamics ; charge-transfer state
Vědní obor RIV	BO - Biofyzika
CEZ	AV0Z50510513 - UMBR-M, BC-A (2005-2011)
UT WOS	000280065100010
DOI	10.1016/j.chemphys.2010.01.007
Anotace	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 S1 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 S1 lifetime of norbixin is within the 15-18 ps range in all solvents, 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-Sn 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).
Pracoviště	Biologické centrum (od r. 2006)
Kontakt	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Rok sběru	2012

Počet záznamů: 1