Abstract
The coordination of a modified rhodamine B (Rhod) to a bis-bipyridine ruthenium (ii) (Ru-bpy) phototrigger complex enables a photodissociation reaction at longer wavelengths through enhanced absorption of green light (532 nm). The very high molar absorptivity of rhodamine (~105 M−1 cm−1) and the high quantum efficiency of Förster resonance energy transfer (FRET) from rhodamine to the Ru-bpy center (0.84) result in an unusually high photosensitivity and uncaging cross-section of the Ru-bpy-rhodamine complex at longer wavelengths.
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Electronic supplementary information (ESI) available: Schematics of the optical bench used for fluorescence measurements; sequence of UV-Vis absorption spectra during photolysis of RuBiMAPN; sequence of UV-Vis emission spectra during photolysis of RuBiMAPNRhod. See DOI: 10.1039/c2pp05415a
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Filevich, O., García-Acosta, B. & Etchenique, R. Energy transfer from a rhodamine antenna to a ruthenium-bipyridine center. Photochem Photobiol Sci 11, 843–847 (2012). https://doi.org/10.1039/c2pp05415a
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DOI: https://doi.org/10.1039/c2pp05415a