Thousandfold Enhancement of Photoreduction Lifetime in Re(bpy)(CO)3 via Spin-Dependent Electron Transfer from a Perylenediimide Radical Anion Donor
- Yale Univ., New Haven, CT (United States); Stockholm Univ. (Sweden)
- Yale Univ., New Haven, CT (United States)
- Northwestern Univ., Evanston, IL (United States)
Spin-dependent intramolecular electron transfer is revealed in the ReI(CO)3(py)(bpy-Ph)–perylenediimide radical anion (ReI-bpy–PDI–•) dyad, a prototype model system for artificial photosynthesis. Quantum chemical calculations and ultrafast transient absorption spectroscopy experiments show that selective photoexcitation of ReI-bpy results in electron transfer from PDI–• to ReI-bpy, forming two distinct charge-shifted states. One is an overall doublet whose return to the ground state is spin-allowed. The other, high-spin quartet state, persists for 67 ns due to spin-forbidden back-electron transfer, constituting a more than thousandfold lifetime improvement compared to the low-spin state. Exploiting this spin dependency holds potential for artificial photosynthetic systems needing long-lived reduced states to perform multi-electron chemistry.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States); Energy Frontier Research Center (EFRC) Argonne-Northwestern Solar Energy Research Center (ANSER)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001059
- OSTI ID:
- 1470380
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 46 Vol. 139; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
| Photoexcited perylene diimide radical anions for the reduction of aryl halides: a bay-substituent effect 
 | journal | January 2018 | 
| Choosing sides: unusual ultrafast charge transfer pathways in an asymmetric electron-accepting cyclophane that binds an electron donor 
 | journal | January 2019 | 
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