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- W4313453996 abstract "Strong-field hexadentate ligands were synthesized and coordinated to cobalt metal centers to result in three new low-spin to low-spin Co(III/II) redox couples. The ligand backbone has been modified with dimethyl amine groups to result in redox potential tuning of the Co(III/II) redox couples from −200 to −430 mV versus Fc+/0. The redox couples surprisingly undergo a reversible molecular switch rearrangement from five-coordinate Co(II) to six-coordinate Co(III) despite the ligands being hexadentate. The complexes exhibit modestly faster electron self-exchange rate constants of 2.2–4.2 M–1 s–1 compared to the high-spin to low-spin redox couple [Co(bpy)3]3+/2+ at 0.27 M–1 s–1, which is attributed to the change in spin state being somewhat offset by this coordination switching behavior. The complexes were utilized as redox shuttles in dye-sensitized solar cells with the near-IR AP25 + D35 dye system and exhibited improved photocurrents over the [Co(bpy)3]3+/2+ redox shuttle (19.8 vs 18.0 mA/cm2). Future directions point toward pairing the low-spin to low-spin Co(II/III) tunable series to dyes with significantly more negative highest occupied molecular orbital potentials that absorb into the near-IR where outer sphere redox shuttles have failed to produce efficient dye regeneration." @default.
- W4313453996 created "2023-01-06" @default.
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- W4313453996 date "2023-01-03" @default.
- W4313453996 modified "2023-10-18" @default.
- W4313453996 title "Molecular Switch Cobalt Redox Shuttle with a Tunable Hexadentate Ligand" @default.
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- W4313453996 doi "https://doi.org/10.1021/jacs.2c12017" @default.
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