| Autor: |
Schweighöfer F; Institute of Physical and Theoretical Chemistry, Goethe-University, Max-von-Laue-Straße 7, D-60438 Frankfurt/Main, Germany., Yüce I, Dworak L, Guo P, Zastrow M, Mayer K, Barta C, Liebmann D, Ziebart N, Rück-Braun K, Wachtveitl J |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2018 Feb 07; Vol. 30 (5), pp. 054001. Date of Electronic Publication: 2018 Feb 07. |
| DOI: |
10.1088/1361-648X/aaa1ac |
| Abstrakt: |
The photoinduced dynamics of two DTE-BODIPY conjugates A, B with carboxylic acid anchoring groups coupled to the surface of TiO 2 were studied by ultrafast transient absorption spectroscopy. For compound A, with an orthogonal orientation of the BODIPY chromophore and the photoswitchable DTE unit, a charge separated state could not be reliably detected. Nevertheless, besides the energy transfer from the BODIPY to the ring-closed DTE-c, indications for an electron transfer reaction were found by analyzing fluorescence quenching on TiO 2 in steady state fluorescence measurements. For compound B with a parallel orientation of chromophore and photoswitch, a charge separated state was conclusively identified for the coupled dyad (TiO 2 ) via the observation of a positive absorption signal (at λ pr > 610 nm) at later delay times. An electron transfer rate of 7 × 10 10 s -1 can be extracted, indicating slower processes in the dyads in comparison to previously published electron transfer reactions of DTE compounds coupled to TiO 2 . |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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