Long-Range Electron Tunneling in Aqueous and Organic Glasses
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...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | deu |
| Published: |
Swiss Chemical Society
2005-03-01
|
| Series: | CHIMIA |
| Subjects: | |
| Online Access: | https://chimia.ch/chimia/article/view/3954 |
| _version_ | 1797987781067145216 |
|---|---|
| author | Oliver S. Wenger Harry B. Gray Jay R. Winkler |
| author_facet | Oliver S. Wenger Harry B. Gray Jay R. Winkler |
| author_sort | Oliver S. Wenger |
| collection | DOAJ |
| description |
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.
|
| first_indexed | 2024-04-11T07:53:33Z |
| format | Article |
| id | doaj.art-3c06f0b1e7d84f758f8eb60d06ed67e3 |
| institution | Directory Open Access Journal |
| issn | 0009-4293 2673-2424 |
| language | deu |
| last_indexed | 2024-04-11T07:53:33Z |
| publishDate | 2005-03-01 |
| publisher | Swiss Chemical Society |
| record_format | Article |
| series | CHIMIA |
| spelling | doaj.art-3c06f0b1e7d84f758f8eb60d06ed67e32022-12-22T04:36:00ZdeuSwiss Chemical SocietyCHIMIA0009-42932673-24242005-03-0159310.2533/000942905777676786Long-Range Electron Tunneling in Aqueous and Organic GlassesOliver S. WengerHarry B. GrayJay R. Winkler 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. https://chimia.ch/chimia/article/view/3954Charge separationElectron transferElectronic couplingSuperexchangeTunneling |
| spellingShingle | Oliver S. Wenger Harry B. Gray Jay R. Winkler Long-Range Electron Tunneling in Aqueous and Organic Glasses CHIMIA Charge separation Electron transfer Electronic coupling Superexchange Tunneling |
| title | Long-Range Electron Tunneling in Aqueous and Organic Glasses |
| title_full | Long-Range Electron Tunneling in Aqueous and Organic Glasses |
| title_fullStr | Long-Range Electron Tunneling in Aqueous and Organic Glasses |
| title_full_unstemmed | Long-Range Electron Tunneling in Aqueous and Organic Glasses |
| title_short | Long-Range Electron Tunneling in Aqueous and Organic Glasses |
| title_sort | long range electron tunneling in aqueous and organic glasses |
| topic | Charge separation Electron transfer Electronic coupling Superexchange Tunneling |
| url | https://chimia.ch/chimia/article/view/3954 |
| work_keys_str_mv | AT oliverswenger longrangeelectrontunnelinginaqueousandorganicglasses AT harrybgray longrangeelectrontunnelinginaqueousandorganicglasses AT jayrwinkler longrangeelectrontunnelinginaqueousandorganicglasses |