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

TitreElectronic tuning effects via π-linkers in tetrathiafulvalene-based dyes
Type de publicationArticle de revue
AuteurGeng, Yan, Pop, Flavia , Yi, Chenyi, Avarvari, Narcis , Grätzel, Michael, Decurtins, Silvio, Liu, Shi-Xia
EditeurRoyal Society of Chemistry
TypeArticle scientifique dans une revue à comité de lecture
Titre de la revueNew Journal of Chemistry
Résumé en anglais

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.

URL de la noticehttp://okina.univ-angers.fr/publications/ua10824
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Titre abrégéNew J. Chem.