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Charge-recombination fluorescence from push-pull electronic systems constructed around amino-substituted
Adela Nano1, Raymond Ziessel, Patrycya Stachelek
1LCOSA, ICPEES, UMR7515, CNRS/Université de Strasbourg/ECPM, 25 rue Becquerel, 67087 Strasbourg, Cedex 02 (France), Fax: (+33) 3-68-85-27-61.
Abstract:
A small series of donor-acceptor molecular dyads has been synthesized and fully characterized. In each case, the acceptor is a dicyanovinyl unit and the donor is a boron dipyrromethene (BODIPY) dye equipped with a single styryl arm bearing a terminal amino group. In the absence of the acceptor, the BODIPY-based dyes are strongly fluorescent in the far-red region and the relaxed excited-singlet states possess significant charge-transfer character. As such, the emission maxima depend on both the solvent polarity and temperature. With the corresponding push-pull molecules, there is a low-energy charge-transfer state that can be observed by both absorption and emission spectroscopy. Here, charge-recombination fluorescence is weak and decays over a few hundred picoseconds or so to recover the ground state. Overall, these results permit evaluation of the factors affecting the probability of charge-recombination fluorescence in push-pull dyes. The photophysical studies are supported by cyclic voltammetry and DFT calculations.
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