Long-Range Electron Tunneling in Aqueous and Organic Glasses
| Autor: | Oliver S. Wenger, Harry B. Gray, Jay R. Winkler |
|---|---|
| Jazyk: | German<br />English<br />French |
| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | CHIMIA, Vol 59, Iss 3 (2005) |
| Druh dokumentu: | article |
| ISSN: | 0009-4293 2673-2424 |
| DOI: | 10.2533/000942905777676786 |
| Popis: | Photoinduced electron transfer (ET) reactions have been investigated in glassy media at 77 K. Distance decay parameters for electron tunneling through water, 2-methyltetrahydrofuran, and toluene have been determined through measurements of donor luminescence quenching by randomly dispersed electron acceptors. Remarkably different long-range ET efficiencies in the three solvents are in accord with the predictions of a super exchange model of distant electronic couplings. We conclude that tunneling energy effects play an important role in long-range ET reactions, and further that the coupling drops off very rapidly across van der Waals gaps betwee nmolecules in glasses. |
| Databáze: | Directory of Open Access Journals |
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