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

SYSNO ASEP	0355284
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Ultrafast dynamics of hydrophilic carbonyl carotenoids - Relation between structure and excited-state properties in polar solvents
Author(s)	Chábera, P. (CZ) Fuciman, M. (CZ) Naqvi, K.R. (NO) Polívka, Tomáš (BC-A)_{RID, ORCID}
Source Title	Chemical Physics. - : Elsevier - ISSN 0301-0104 Roč. 373, 1-2 (2010), s. 56-64
Number of pages	9 s.
Language	eng - English
Country	NL - Netherlands
Keywords	hydrophilic carotenoids ; excited-state dynamics ; charge-transfer state
Subject RIV	BO - Biophysics
CEZ	AV0Z50510513 - UMBR-M, BC-A (2005-2011)
UT WOS	000280065100010
DOI	10.1016/j.chemphys.2010.01.007
Annotation	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).
Workplace	Biology Centre (since 2006)
Contact	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Year of Publishing	2012

Number of the records: 1