Spectroscopic properties of the triple bond carotenoid alloxanthin\n

0463706 - MBÚ 2017 RIV NL eng J - Journal Article
West, R. - Kesan, G. - Trsková, Eliška - Sobotka, Roman - Kaňa, Radek - Fuciman, M. - Polívka, T.
Spectroscopic properties of the triple bond carotenoid alloxanthin
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Chemical Physics Letters. Roč. 653, June (2016), s. 167-172. ISSN 0009-2614. E-ISSN 1873-4448
R&D Projects: GA ČR GBP501/12/G055; GA ČR(CZ) GA16-10088S; GA MŠMT(CZ) LO1416; GA MŠMT(CZ) ED2.1.00/19.0392
Institutional support: RVO:61388971
Keywords : ULTRAFAST DYNAMICS * EXCITED-STATES * RELAXATION
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.815, year: 2016

Alloxanthin, which has two triple bonds within its backbone, was studied by steady-state and femtosecond transient absorption spectroscopies. Alloxanthin demonstrates an S-2 energy comparable to its non-triple bond homolog, zeaxanthin, while the S-1 lifetime of 19 ps is markedly longer than that of zeaxanthin (9 ps). Along with corroborating quantum chemistry calculations, the results show that the long-lived S1 state of alloxanthin, which typically corresponds to the dynamic of a shorter carotenoid backbone, implies the triple bond isolates the conjugation of the backbone, increasing the S-1 state energy and diminishing the S-1-S-2 energy gap. (C) 2016 Elsevier B.V. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0263055