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Journal articles
Fluorenylporphyrins functionalized by electrochromic ruthenium units as redox-triggered fluorescence switches
Abstract : Two dyads containing tris-and tetrakis-meso-fluorenyl-substituted porphyrin and ethynylruthenium units, 1 and 2, were investigated by emission spectro-electrochemical (SEC) methods for their potential use as fluorescence switches. The ruthenium group as a potential electron donor and the porphyrin as a potential electron acceptor are connected by a phenylene bridge in 1 and by a fluorenylene bridge in 2. The new fluorenyl-linked dyad 2 was probed by UV-visible, near-infrared (NIR) and infrared (IR) absorption SEC methods, and the properties interpreted with the aid of hybrid-DFT computations, for comparison with reported data for 1. The porphyrin-based fluorescence of 1 decreased in intensity upon oxidation to 1 + and decreased further on oxidising 1 + to 1 2+. Negligible change in the fluorescence intensity of 2 was observed upon oxidation to 2 + but the intensity decreased upon subsequent oxidation of 2 + to 2 2+. These findings contrast with data reported for some other porphyrins appended with redox-active ruthenium or iron units, where fluorescence intensities increase upon oxidation of the peripheral metal centers, but they match data reported more recently for closely related arrays. A rationale for these apparently contrasting observations is proposed. A c c e p t e d m a n u s c r i p t
Cited literature [67 references]
https://hal-univ-rennes1.archives-ouvertes.fr/hal-02278395
Contributor : Laurent Jonchère <>
Submitted on : Monday, December 16, 2019 - 12:40:41 PM
Last modification on : Monday, January 13, 2020 - 1:24:49 AM
Document(s) archivé(s) le : Tuesday, March 17, 2020 - 5:14:11 PM
Contributor : Laurent Jonchère <>
Submitted on : Monday, December 16, 2019 - 12:40:41 PM
Last modification on : Monday, January 13, 2020 - 1:24:49 AM
Document(s) archivé(s) le : Tuesday, March 17, 2020 - 5:14:11 PM
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