Spectroscopy and excited state dynamics of nearly infinite polyenes
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F20%3A43901338" target="_blank" >RIV/60076658:12310/20:43901338 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/68378271:_____/20:00537021
Výsledek na webu
<a href="https://pubs.rsc.org/en/content/articlelanding/2020/CP/D0CP02465A#!divAbstract" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2020/CP/D0CP02465A#!divAbstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d0cp02465a" target="_blank" >10.1039/d0cp02465a</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Spectroscopy and excited state dynamics of nearly infinite polyenes
Popis výsledku v původním jazyce
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. The limiting wavelength for the S-0 -> S(2)transitions is consistent with the persistence of bond length alternation in the electronic ground states and a HOMO-LUMO band gap in polyenes withN approximate to 200. The coincidence of the well-resolved S-0 -> S(2)electronic origins and the convergence of the excited state lifetimes in the four polymers point to a common, "nearly infinite" polyene limit.
Název v anglickém jazyce
Spectroscopy and excited state dynamics of nearly infinite polyenes
Popis výsledku anglicky
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. The limiting wavelength for the S-0 -> S(2)transitions is consistent with the persistence of bond length alternation in the electronic ground states and a HOMO-LUMO band gap in polyenes withN approximate to 200. The coincidence of the well-resolved S-0 -> S(2)electronic origins and the convergence of the excited state lifetimes in the four polymers point to a common, "nearly infinite" polyene limit.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10610 - Biophysics
Návaznosti výsledku
Projekt
Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.
Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2020
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Physical Chemistry Chemical Physics
ISSN
1463-9076
e-ISSN
—
Svazek periodika
22
Číslo periodika v rámci svazku
32
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
13
Strana od-do
17867-17879
Kód UT WoS článku
000562560400009
EID výsledku v databázi Scopus
2-s2.0-85089815155