Excited-state dynamics of astaxanthin aggregates

0395029 - BC 2014 RIV NL eng J - Článek v odborném periodiku
Fuciman, M. - Durchan, Milan - Šlouf, V. - Kesan, G. - Polívka, Tomáš
Excited-state dynamics of astaxanthin aggregates.
Chemical Physics Letters. Roč. 568, č. 1 (2013), s. 21-25. ISSN 0009-2614. E-ISSN 1873-4448
Institucionální podpora: RVO:60077344
Klíčová slova: astaxanthin * aggregates * excited states
Kód oboru RIV: BO - Biofyzika
Impakt faktor: 1.991, rok: 2013

Astaxanthin forms three types of aggregates in hydrated dimethyl sulfoxide (DMSO). In DMSO/water ratio of 1:1, a red-shifted J-aggregate with maximum at 570 nm is generated, while a ratio of 1:9 produces blue-shifted H-aggregates with peaks at 386 nm (H1) and 460 nm (H2). Monomeric astaxanthin in DMSO has an S-1 lifetime of 5.3 ps, but a long-lived (33 ps) S* signal was also identified. Aggregation changes the S-1 lifetimes to 17 Ps (H1), 30 Ps (H2), and 14 ps (J). Triplet state of astaxanthin, most likely generated via singlet homofission, was observed in H1 and H2 aggregates.
Trvalý link: http://hdl.handle.net/11104/0223184