Muon Spin Rotation (μSR) for Characterizing Radical Addition to C=S in Xanthene-9-thione and Thioxanthene-9-thione

Muonium (μ+e−) can be produced by capture of an electron by a spin-polarized muon (μ+) and has been utilized as a light isotope of hydrogen. In this paper, we demonstrate muon spin rotation (μSR) experiments and preliminary computational analyses of the regioselective muonium addition to xanthene-9-...

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Bibliographic Details
Published inBulletin of the Chemical Society of Japan Vol. 96; no. 5; pp. 461 - 464
Main Authors Ito, Shigekazu, Akama, Hikaru, Kojima, Kenji M, McKenzie, Iain, Kuwahata, Kazuaki, Tachikawa, Masanori
Format Journal Article
LanguageEnglish
Published Tokyo The Chemical Society of Japan 15.05.2023
Chemical Society of Japan
Subjects
Electron spin
Hydrofluorocarbons
Muon spin rotation
Muonium
Muonium
Thioketones
Radicals
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Summary:Muonium (μ+e−) can be produced by capture of an electron by a spin-polarized muon (μ+) and has been utilized as a light isotope of hydrogen. In this paper, we demonstrate muon spin rotation (μSR) experiments and preliminary computational analyses of the regioselective muonium addition to xanthene-9-thione and thioxanthene-9-thione providing the C-centered radicals. The transverse-field muon spin rotation (TF-μSR) experiments of the cyclic thioketones revealed considerable increase of muon hyperfine coupling constants (muon hfc, Aμ) compared with the muoniated thiobenzophenone, indicating crucial roles of the bridging chalcogen atom promoting the overlap between the S–Mu bond orbital and the radical p orbital.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20230081