Probing the efficiency of electron transfer through porphyrin-based molecular wires.
Electron transfer over long distances is important for many future applications in molecular electronics and solar energy harvesting. In these contexts, it is of great interest to find molecular systems that are able to efficiently mediate electrons in a controlled manner over nanometer distances, t...
| मुख्य लेखकों: | , , , , , , |
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| स्वरूप: | Journal article |
| भाषा: | English |
| प्रकाशित: |
2007
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| _version_ | 1826295463831142400 |
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| author | Winters, M Dahlstedt, E Blades, H Wilson, C Frampton, M Anderson, H Albinsson, B |
| author_facet | Winters, M Dahlstedt, E Blades, H Wilson, C Frampton, M Anderson, H Albinsson, B |
| author_sort | Winters, M |
| collection | OXFORD |
| description | Electron transfer over long distances is important for many future applications in molecular electronics and solar energy harvesting. In these contexts, it is of great interest to find molecular systems that are able to efficiently mediate electrons in a controlled manner over nanometer distances, that is, structures that function as molecular wires. Here we investigate a series of butadiyne-linked porphyrin oligomers with ferrocene and fullerene (C60) terminals separated by one, two, or four porphyrin units (Pn, n = 1, 2, or 4). When the porphyrin oligomer bridges are photoexcited, long-range charge separated states are formed through a series of electron-transfer steps and the rates of photoinduced charge separation and charge recombination in these systems were elucidated using time-resolved absorption and emission measurements. The rates of long-range charge recombination, through these conjugated porphyrin oligomers, are remarkably fast (kCR2 = 15 - 1.3 x 108 s-1) and exhibit very weak distance dependence, particularly comparing the systems with n = 2 and n = 4. The observation that the porphyrin tetramer mediates fast long-range charge transfer, over 65 A, is significant for the application of these structures as molecular wires. |
| first_indexed | 2024-03-07T04:01:26Z |
| format | Journal article |
| id | oxford-uuid:c4b4a6c3-49d5-4054-a5e3-efcd090abe00 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:01:26Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | oxford-uuid:c4b4a6c3-49d5-4054-a5e3-efcd090abe002022-03-27T06:25:29ZProbing the efficiency of electron transfer through porphyrin-based molecular wires.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c4b4a6c3-49d5-4054-a5e3-efcd090abe00EnglishSymplectic Elements at Oxford2007Winters, MDahlstedt, EBlades, HWilson, CFrampton, MAnderson, HAlbinsson, BElectron transfer over long distances is important for many future applications in molecular electronics and solar energy harvesting. In these contexts, it is of great interest to find molecular systems that are able to efficiently mediate electrons in a controlled manner over nanometer distances, that is, structures that function as molecular wires. Here we investigate a series of butadiyne-linked porphyrin oligomers with ferrocene and fullerene (C60) terminals separated by one, two, or four porphyrin units (Pn, n = 1, 2, or 4). When the porphyrin oligomer bridges are photoexcited, long-range charge separated states are formed through a series of electron-transfer steps and the rates of photoinduced charge separation and charge recombination in these systems were elucidated using time-resolved absorption and emission measurements. The rates of long-range charge recombination, through these conjugated porphyrin oligomers, are remarkably fast (kCR2 = 15 - 1.3 x 108 s-1) and exhibit very weak distance dependence, particularly comparing the systems with n = 2 and n = 4. The observation that the porphyrin tetramer mediates fast long-range charge transfer, over 65 A, is significant for the application of these structures as molecular wires. |
| spellingShingle | Winters, M Dahlstedt, E Blades, H Wilson, C Frampton, M Anderson, H Albinsson, B Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title | Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title_full | Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title_fullStr | Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title_full_unstemmed | Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title_short | Probing the efficiency of electron transfer through porphyrin-based molecular wires. |
| title_sort | probing the efficiency of electron transfer through porphyrin based molecular wires |
| work_keys_str_mv | AT wintersm probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT dahlstedte probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT bladesh probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT wilsonc probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT framptonm probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT andersonh probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires AT albinssonb probingtheefficiencyofelectrontransferthroughporphyrinbasedmolecularwires |