Real-time observation of the charge transfer to solvent dynamics
| Autor: | Andrea Cannizzo, Olivier Bräm, Majed Chergui, Fabrizio Messina |
|---|---|
| Přispěvatelé: | Messina, F, Braem, O, Cannizzo, A, Chergui, M |
| Rok vydání: | 2013 |
| Předmět: |
electron transfer
ultrafast fluorescence charge-transfer-to-solvent solvation homogeneity Physics::Biological Physics Multidisciplinary Materials science Aqueous solution Settore FIS/01 - Fisica Sperimentale General Physics and Astronomy Halide Charge (physics) General Chemistry Electron 620 Engineering General Biochemistry Genetics and Molecular Biology Condensed Matter::Soft Condensed Matter Solvent Electron transfer Chemical physics Scientific method Physics::Chemical Physics Solvent effects Settore CHIM/02 - Chimica Fisica |
| Zdroj: | Messina, Fabrizio; Bräm, Oliver; Cannizzo, Andrea; Chergui, Majed (2013). Real-time observation of the charge-transfer-to-solvent dynamics. Nature communications, 4(1) Nature Publishing Group 10.1038/ncomms3119 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms3119 |
| Popis: | Intermolecular electron-transfer reactions have a crucial role in biology, solution chemistry and electrochemistry. The first step of such reactions is the expulsion of the electron to the solvent, whose mechanism is determined by the structure and dynamical response of the latter. Here we visualize the electron transfer to water using ultrafast fluorescence spectroscopy with polychromatic detection from the ultraviolet to the visible region, upon photo-excitation of the so-called charge transfer to solvent states of aqueous iodide. The initial emission is short lived (similar to 60 fs) and it relaxes to a broad distribution of lower-energy charge transfer to solvent states upon rearrangement of the solvent cage. This distribution reflects the inhomogeneous character of the solvent cage around iodide. Electron ejection occurs from the relaxed charge transfer to solvent states with lifetimes of 100-400 fs that increase with decreasing emission energy. |
| Databáze: | OpenAIRE |
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