Solvent-dependent ultrafast internal conversion dynamics of n'-apo-beta-carotenoic-n'-acids (n = 8, 10, 12)

Physical Chemistry Chemical Physics : PCCP
Sebastian StalkeKawon Oum

Abstract

The ultrafast internal conversion dynamics of 12'-apo-beta-carotenoic-12'-acid (12'CA), 10'-apo-beta-carotenoic-10'-acid (10'CA) and 8'-apo-beta-carotenoic-8'-acid (8'CA) have been investigated by femtosecond pump-probe spectroscopy. The three apocarotenoic acids were excited to the S(2) state with different excess energies. Time constants tau(1) for the IC process S(1)/ICT --> S(0) were measured by probing the dynamics at 390 nm (S(0) --> S(2)), 575 nm (S(1)/ICT --> S(n)), 850, 860 and 890 nm (S(2) --> S(n) and S(1)/ICT --> S(0)). In nonpolar solvents, the observed reduction of the tau(1) values with increasing conjugation length of the acids is consistent with a reduction of the energy gap between the S(1)/ICT and S(0) states. The values are in good agreement with those of the corresponding apocarotenals studied previously in our groups. In polar solvents, a pronounced reduction of tau(1) values was observed for 12'CA, however the behavior was different from that observed for the respective aldehyde 12'-apo-beta-caroten-12'-al studied previously: First, the degree of tau(1) reduction in methanol was milder for 12'CA (218 --> 55 ps) than for 12'-apo-beta-caroten-12'-al (220 --> 8 ps). Secondly, for 12'CA the plateau of solvent...Continue Reading

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Citations

Nov 20, 2013·Annual Review of Physical Chemistry·Tiago Buckup, Marcus Motzkus
Mar 18, 2009·Biophysical Journal·Tomás PolívkaJanos K Lanyi
Sep 25, 2009·Chemical Physics Letters·Nirmalya ChatterjeeHarry A Frank
Jan 13, 2017·Physical Chemistry Chemical Physics : PCCP·Daisuke KosumiHideki Hashimoto
Jun 22, 2017·Physical Chemistry Chemical Physics : PCCP·Riccardo SpeziaBenedetta Mennucci
May 18, 2016·Physical Chemistry Chemical Physics : PCCP·Oliver FlenderThomas Lenzer
Apr 30, 2015·Physical Chemistry Chemical Physics : PCCP·Dariusz M Niedzwiedzki, Laura Cranston
May 8, 2010·Physical Chemistry Chemical Physics : PCCP·Pavel CháberaTomás Polívka
Jan 31, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Carolin König, Johannes Neugebauer
May 10, 2011·Physical Chemistry Chemical Physics : PCCP·Daisuke KosumiHideki Hashimoto
Feb 22, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Maria EkimovaKawon Oum
Feb 9, 2012·Physical Chemistry Chemical Physics : PCCP·Peter W LohseKawon Oum
May 10, 2018·Archives of Biochemistry and Biophysics·Dariusz M Niedzwiedzki, Robert E Blankenship
Jun 16, 2010·The Journal of Physical Chemistry. B·Tomás PolívkaMadeleine Helliwell
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Nov 2, 2017·The Journal of Physical Chemistry. a·Mirko ScholzKawon Oum
Feb 23, 2018·The Journal of Physical Chemistry. B·Hristina Staleva-MustoTomáš Polívka
Feb 16, 2008·The Journal of Physical Chemistry. B·Peter W LohseKawon Oum

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