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Increasing the Lifetimes of Charge Separated States in Porphyrin-Fullerene Polyads

Abstract

Two linear polyads were designed using zinc(II)porphyrin, [ZnP], and N-methyl-2-phenyl-3,4-fullero-pyrrolidine (C60) where C60 is dandling either at terminal position of [ZnP]-C6H4-≡-C6H4-[ZnP]-C60 (1) or at the central position in [ZnP]-C6H4-≡-C6H4-[ZnP(C60)]-C6H4-≡-C6H4-[ZnP] (2) in order to test whether the fact of having one or two side electron donors, influences the rate of electron transfer, ket. These polyads were studied by cyclic voltammograms, DFT computations, steady state and time-resolved fluorescence spectroscopy, and femptosecond transient absorption spectroscopy (fs-TAS). The photo-induced electron transfer confirmed by the detection of the charge separated state [ZnP+•]/C60‾• from fs-TAS occurs with rates (ket) of 3-4 x 1010 s-1 whereas the charge recombinations (CR) are found to produce either the [ZnP] ground state via two pathways (central [ZnP+•]/C60‾• (ps) and terminal central [ZnP+•]/C60‾• (ns)) producing [1ZnP] (ground state) and [3ZnP*]). The formation of the T1 species is more predominant for 2.

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Publication details

The article was received on 21 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP04193D
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Increasing the Lifetimes of Charge Separated States in Porphyrin-Fullerene Polyads

    D. GAO, S. Aly, P. Karsenti, G. Brisard and P. D. Harvey, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04193D

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