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Stable near-infrared anionic polymethine dyes: structure, photophysical, and redox properties
Pierre-Antoine Bouit1, Emmanuel Di Piazza, Stéphane Rigaut
1University of Lyon, Laboratoire de Chimie, UMR 5182 CNRS, Ecole Normale Supérieure de Lyon, 46 allée d'Italie, 69007 Lyon, France.
Abstract:
The concept of cyanine has been successfully extended to an anionic heptamethine dye featuring tricyanofuran (TCF) moieties in terms of structure, reactivity, and photophysical properties. Importantly, absorption and emission are red-shifted compared to its classical cationic analog without any cost in terms of thermal stability. In addition to its "cyanine" behavior, this molecule exhibits further redox properties: oxidation and reduction led to the reversible formation of radical species whose absorption is in marked contrast with that of cyanines.
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