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Article dans une revue

Electronic tuning effects via π-linkers in tetrathiafulvalene-based dyes

Abstract :

Four new tetrathiafulvalene (TTF)-based dyes featured with a donor–bridge–acceptor (D–π–A) structure were synthesized and characterized. All of them undergo two reversible oxidations to form stable radical cation and dication species. The electronic interactions between the TTF donor and the cyanoacrylic acid acceptor through the different π-linkers have been demonstrated by the presence of a photo-induced intramolecular charge-transfer (ICT) absorption band in the visible region. A red shift of the ICT state can be finely tuned by the degree of aromaticity and extended conjugation of π-bridges. To some extent, the oxidation potentials of these dyes are affected by the nature of π-bridges. They have been applied in organic dye-sensitized solar cells, showing relatively low power conversion efficiencies of up to 0.87% due to substantial charge recombination losses.

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https://hal.univ-angers.fr/hal-03344927
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Soumis le : mercredi 15 septembre 2021 - 11:50:30
Dernière modification le : vendredi 4 février 2022 - 16:16:07

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Yan Geng, Flavia Pop, Chenyi Yi, Narcis Avarvari, Michael Grätzel, et al.. Electronic tuning effects via π-linkers in tetrathiafulvalene-based dyes. New Journal of Chemistry, Royal Society of Chemistry, 2014, 38 (7), Non spécifié. ⟨10.1039/c4nj00428k⟩. ⟨hal-03344927⟩

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