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Journal Article

Ultrafast solvation dynamics of 12′-apo-β-carotenoic-12′-acid in [C6mim]+[Tf2N]−.


Scholz,  M.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society;

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Lohse, P. W., Ehlers, F., Oum, K., Scholz, M., & Lenzer, T. (2010). Ultrafast solvation dynamics of 12′-apo-β-carotenoic-12′-acid in [C6mim]+[Tf2N]−. Chemical Physics, 373(1-2), 45-49. doi:10.1016/j.chemphys.2009.12.028.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-A9B8-E
Intra- and intermolecular relaxation pathways of 12′-apo-β-carotenoic-12′-acid, an apocarotenoid with terminal carbonyl substitution, were identified after photoexcitation using ultrafast pump-supercontinuum probe spectroscopy in the 350–750 nm range. The apocarotenoid was dissolved in 1-n-hexyl-3-methylimidazolium-bis(trifluoromethylsulfonyl)amide and excited to the S2 state at 482 nm. Internal conversion occurred within 170 fs to a single S1/ICT state with intramolecular charge transfer character. This state exhibits characteristic excited state absorption band-shifts due to time-dependent solvation, which appears to be a general feature of carbonyl apocarotenoids with polarity-dependent S1/ICT lifetimes. We also demonstrate that higher pump beam energies open a route for the clean preparation of long-lived radical cations by resonant one-color two-photon excitation using S2 as the intermediate state. The radical cations are easily identified by a characteristic absorption peak in the region 700–750 nm and an absorption tail towards shorter wavelengths.