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Article Abstract
A key feature of prominent transition-metal-containing photoredox catalysts (PCs) is high quantum yield access to long-lived excited states characterized by a change in spin multiplicity. For organic PCs, challenges emerge for promoting excited-state intersystem crossing (ISC), particularly when potent excited-state reductants are desired. Herein, we report a design exploiting orthogonal π-systems and an intermediate-energy charge-transfer excited state to maximize ISC yields (Φ) in a highly reducing ( E* = -1.7 V vs SCE), visible-light-absorbing phenoxazine-based PC. Simple substitution of N-phenyl for N-naphthyl is shown to dramatically increase Φ from 0.11 to 0.91 without altering catalytically important properties, such as E*.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5920652 | PMC |
| http://dx.doi.org/10.1021/jacs.8b01001 | DOI Listing |
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