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  Luminescent Iridium Complexes with a Sulfurated Bipyridine Ligand: PCET Thermochemistry of the Disulfide Unit and Photophysical Properties

Oelschlegel, M., Hua, S.-A., Schmid, L., Marquetand, P., Baeck, A., Borter, J.-H., et al. (2022). Luminescent Iridium Complexes with a Sulfurated Bipyridine Ligand: PCET Thermochemistry of the Disulfide Unit and Photophysical Properties. Inorganic Chemistry, 61(35), 13944-13955. doi:10.1021/acs.inorgchem.2c01930.

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 Creators:
Oelschlegel, Manuel, Author
Hua, Shoo-An, Author
Schmid, Lucius, Author
Marquetand, Philipp, Author
Baeck, Anna, Author
Borter, Jan-Hendrik1, Author           
Luecken, Jana, Author
Dechert, Sebastian, Author
Wenger, Oliver S., Author
Siewert, Inke, Author
Schwarzer, Dirk1, Author           
Gonzalez, Leticia, Author
Meyer, Franc, Author
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1Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Max Planck Society, ou_3350158              

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 Abstract: Molecular systems combining light harvesting and charge storage are receiving great attention in the context of, for example, artificial photosynthesis and solar fuel generation. As part of ongoing efforts to develop new concepts for photoinduced proton-coupled electron transfer (PCET) reactivities, we report a cyclometallated iridium(III) complex [Ir(ppy)2(S–Sbpy)](PF6) ([1]PF6) equipped with our previously developed sulfurated bipyridine ligand S–Sbpy. A new one-step synthetic protocol for S–Sbpy is developed, starting from commercially available 2,2′-bipyridine, which significantly facilitates the use of this ligand. [1]+ features a two-electron reduction with potential inversion (|E1| > |E2|) at moderate potentials (E1 = −1.12, E2 = −1.11 V versus. Fc+/0 at 253 K), leading to a dithiolate species [1]–. Protonation with weak acids allows for determination of pKa = 23.5 in MeCN for the S–H···S– unit of [1H]. The driving forces for both the H atom and the hydride transfer are calculated to be ∼60 kcal mol–1 and verified experimentally by reaction with a suitable H atom and a hydride acceptor, demonstrating the ability of [1]+ to serve as a versatile PCET reagent, albeit with limited thermal stability. In MeCN solution, an orange emission for [1]PF6 from a triplet-excited state was found. Density functional calculations and ultrafast absorption spectroscopy are used to give insight into the excited-state dynamics of the complex and suggest a significantly stretched S–S bond for the lowest triplet-state T1. The structural responsiveness of the disulfide unit is proposed to open an effective relaxation channel toward the ground state, explaining the unexpectedly short lifetime of [1]+. These insights as well as the quantitative ground-state thermochemistry data provide valuable information for the use of S–Sbpy-functionalized complexes and their disulfide-/dithiol-directed PCET reactivity.

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Language(s): eng - English
 Dates: 2022-08-24
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.inorgchem.2c01930
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 61 (35) Sequence Number: - Start / End Page: 13944 - 13955 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669