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Title: Thousandfold Enhancement of Photoreduction Lifetime in Re(bpy)(CO)3 via Spin-Dependent Electron Transfer from a Perylenediimide Radical Anion Donor

Journal Article · · Journal of the American Chemical Society

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

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