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Issue 22, 2012
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Ultrafast exciton dynamics after Soret- or Q-band excitation of a directly β,β′-linked bisporphyrin

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Abstract

We report on a comprehensive transient absorption study with β,β′-linked bis[tetraphenylporphyrinato-zinc(II)] and its corresponding monomer, covering the ultrafast dynamics from femtoseconds up to several microseconds. By exciting these porphyrins either to their first (S1) or second (S2) electronically excited states and by probing the subsequent dynamics, a multitude of reaction pathways have been identified. In the spectral region associated with the ground-state recovery of the bisporphyrin, transient absorption changes occur within the first few picoseconds, which are ascribable to excitonic interaction both in the S2 (fs time-domain) and in the S1 (ps time-domain) state. This is substantiated by complementary experiments with the monomeric porphyrin, in which the S2 state exhibits a longer lifetime. In contrast to the picosecond dynamics the bisporphyrin and the monomer behave similarly on the nanosecond time-scale, that is nearly all excited molecules eventually reach a long-lived triplet excited state.

Graphical abstract: Ultrafast exciton dynamics after Soret- or Q-band excitation of a directly β,β′-linked bisporphyrin

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Publication details

The article was received on 16 Nov 2011, accepted on 12 Apr 2012 and first published on 01 May 2012


Article type: Paper
DOI: 10.1039/C2CP23608G
Phys. Chem. Chem. Phys., 2012,14, 8038-8050

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    Ultrafast exciton dynamics after Soret- or Q-band excitation of a directly β,β′-linked bisporphyrin

    M. Kullmann, A. Hipke, P. Nuernberger, T. Bruhn, D. C. G. Götz, M. Sekita, D. M. Guldi, G. Bringmann and T. Brixner, Phys. Chem. Chem. Phys., 2012, 14, 8038
    DOI: 10.1039/C2CP23608G

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