| Autor: |
Arne C. Sell, Julius C. Wetzel, Matthias Schmitz, A. Wouter Maijenburg, Georg Woltersdorf, Robert Naumann, Christoph Kerzig |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Dalton transactions (Cambridge, England : 2003). 51(28) |
| ISSN: |
1477-9234 |
| Popis: |
Long triplet lifetimes of excited photosensitizers are essential for efficient energy transfer reactions in water, given that the concentrations of dissolved oxygen and suitable acceptors in aqueous media are typically much lower than in organic solvents. Herein, we report the design, synthesis and photochemical characterization of two structurally related water-soluble ruthenium complex-based dyads decorated with a covalently attached pyrene chromophore. The triplet energy of the latter is slightly below that of the metal complex enabling a so-called triplet reservoir and excited-state lifetime extensions of up to two orders of magnitude. The diimine co-ligands, which can be modified easily, have a major impact on both the ultrafast intramolecular energy transfer (iEnT) kinetics upon excitation with visible light and the lifetime of the resulting long-lived pyrene triplet. The phenanthroline-containing dyad shows fast triplet pyrene formation (25 ps) and an exceptionally long triplet lifetime beyond 50 microseconds in neat water. The iEnT process |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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