Spectroscopy and excited state dynamics of nearly infinite polyenes

0537021 - FZÚ 2021 RIV GB eng J - Journal Article
Šebelík, V. - Kloz, Miroslav - Rebarz, Mateusz - Přeček, Martin - Kang, E.-H. - Choi, T.-L. - Christensen, R.L. - Polívka, T.
Spectroscopy and excited state dynamics of nearly infinite polyenes.
Physical Chemistry Chemical Physics. Roč. 22, č. 32 (2020), s. 17867-17879. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA MŠMT EF15_003/0000447
Grant - others:OP VVV - ELIBIO(XE) CZ.02.1.01/0.0/0.0/15_003/0000447
Research Infrastructure: ELI Beamlines III - 90141
Institutional support: RVO:68378271
Keywords : lying electronic states * optical spectroscopy * ultrafast dynamics * alkylidene complexes * s-asterisk * light * carotenoids * cyclopolymerization * chain * absorption
OECD category: Biophysics
Impact factor: 3.676, year: 2020
Method of publishing: Limited access
https://doi.org/10.1039/d0cp02465a

Steady-state and transient absorption spectra with <50 fs time resolution were obtained for two conjugated polymers, both with approximate to 200 conjugated double bonds (N), constrained in planar, stable, polyene frameworks. Solutions of the polymers exhibit the same S-2 -> S-1 -> S* -> S(0)decay pathway observed for theN= 11-19 polyene oligomers and for zeaxanthin homologues withN= 11-23. Comparisons with the excited state dynamics of polydiactylene and a much longer, more disordered polyene polymer (poly(DEDPM)) show that the S-2, S-1, and S* lifetimes of the four polymers are almost identical. The S* signals in the polymers are assigned to absorption from vibrationally excited ground states. In spite of significant heterogeneities and variations in conjugation lengths in these long polyenes, their S-0 -> S(2)absorptions are vibronically-resolved in room temperature solutions with electronic origins at approximate to 600 nm.
Permanent Link: http://hdl.handle.net/11104/0314779