Accumulation of mono-reduced [Ir(piq)2(LL)] photosensitizers relevant for solar fuels production
(2022) Photochemical & Photobiological Sciences — (2022)
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- A series of nine [Ir(piq)2(LL)]+.PF6– photosensitizers, where piqH = 1-phenylisoquinoline, was developed and investigated for excited-state electron transfer with sacrificial electron donors that included triethanolamine (TEOA), triethylamine (TEA) and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole (BIH) in acetonitrile. The photosensitizers were obtained in 57–82% yield starting from the common [Ir(piq)2µ-Cl]2 precursor and were all characterized by UV–Vis absorption as well as by steady-state, time-resolved spectroscopies and electrochemistry. The excited-state lifetimes ranged from 250 to 3350 ns and excited-state electron transfer quenching rate constants in the 109 M–1 s–1 range were obtained when BIH was used as electron donor. These quenching rate constants were three orders of magnitude higher than when TEA or TEOA was used. Steady-state photolysis in the presence of BIH showed that the stable and reversible accumulation of mono-reduced photosensitizers was possible, highlighting the potential use of these Ir-based photosensitizers in photocatalytic reactions relevant for solar fuels production.
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Wodon, M., De Kreijger, S., Sampaio, R. N., Elias, B., & Troian-Gautier, L. (2022). Accumulation of mono-reduced [Ir(piq)2(LL)] photosensitizers relevant for solar fuels production. Photochemical & Photobiological Sciences. Accepted/in-press. https://doi.org/10.1007/s43630-022-00233-z (Original work published 2022)