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Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds

The positive muon (μ (+)) can be regarded as a light isotope of proton and has been an important tool to study radical reactions of organic compounds. Recently, muons have been applied to produce short‐lived paramagnetic species from the heavier unsaturated organic molecules including the p‐block el...

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Autor principal: Ito, Shigekazu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9796767/
https://www.ncbi.nlm.nih.gov/pubmed/35702738
http://dx.doi.org/10.1002/chem.202200843
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author Ito, Shigekazu
author_facet Ito, Shigekazu
author_sort Ito, Shigekazu
collection PubMed
description The positive muon (μ (+)) can be regarded as a light isotope of proton and has been an important tool to study radical reactions of organic compounds. Recently, muons have been applied to produce short‐lived paramagnetic species from the heavier unsaturated organic molecules including the p‐block elements. This article overviews recent muon spin rotation/resonance (μSR) studies on the phosphorus analogs of alkenes, anthracenes, and cyclobutane‐1,3‐diyls together with the fundamentals of μSR. The acyclic phosphaalkene of P=C and phosphasilenes of P=Si can accept muonium (Mu=[μ (+) e (−)]) at the heavier double bonds, and the corresponding radicals have been characterized. The phosphorus atom in 9‐phosphaanthracene, whose P=C double bond is stabilized by the peri‐substituted CF(3) groups, predominantly captures muonium to provide the corresponding paramagnetic fused heterocyclic system. The peri‐trifluoromethyl groups are functional to promote the unprecedented light isotope effect of muon providing the planar three‐cyclic molecular structure to consume the increased zero‐point energy. The formally open‐shell singlet 1,3‐diphosphacyclobutane‐2,4‐diyl unit can accept muonium at the (ylidic) phosphorus or the skeletal radicalic carbon, and the corresponding paramagnetic phosphorus heterocycles can be characterized by μSR. The findings on these muoniation processes to the unsaturated phosphorus‐containing compounds will contribute not only to development of novel paramagnetic functional species but also to progress on muon science.
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spelling pubmed-97967672023-01-04 Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds Ito, Shigekazu Chemistry Reviews The positive muon (μ (+)) can be regarded as a light isotope of proton and has been an important tool to study radical reactions of organic compounds. Recently, muons have been applied to produce short‐lived paramagnetic species from the heavier unsaturated organic molecules including the p‐block elements. This article overviews recent muon spin rotation/resonance (μSR) studies on the phosphorus analogs of alkenes, anthracenes, and cyclobutane‐1,3‐diyls together with the fundamentals of μSR. The acyclic phosphaalkene of P=C and phosphasilenes of P=Si can accept muonium (Mu=[μ (+) e (−)]) at the heavier double bonds, and the corresponding radicals have been characterized. The phosphorus atom in 9‐phosphaanthracene, whose P=C double bond is stabilized by the peri‐substituted CF(3) groups, predominantly captures muonium to provide the corresponding paramagnetic fused heterocyclic system. The peri‐trifluoromethyl groups are functional to promote the unprecedented light isotope effect of muon providing the planar three‐cyclic molecular structure to consume the increased zero‐point energy. The formally open‐shell singlet 1,3‐diphosphacyclobutane‐2,4‐diyl unit can accept muonium at the (ylidic) phosphorus or the skeletal radicalic carbon, and the corresponding paramagnetic phosphorus heterocycles can be characterized by μSR. The findings on these muoniation processes to the unsaturated phosphorus‐containing compounds will contribute not only to development of novel paramagnetic functional species but also to progress on muon science. John Wiley and Sons Inc. 2022-07-25 2022-09-22 /pmc/articles/PMC9796767/ /pubmed/35702738 http://dx.doi.org/10.1002/chem.202200843 Text en © 2022 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Reviews
Ito, Shigekazu
Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title_full Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title_fullStr Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title_full_unstemmed Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title_short Muon Spin Rotation/Resonance (μSR) for Studying Radical Reactivity of Unsaturated Organophosphorus Compounds
title_sort muon spin rotation/resonance (μsr) for studying radical reactivity of unsaturated organophosphorus compounds
topic Reviews
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9796767/
https://www.ncbi.nlm.nih.gov/pubmed/35702738
http://dx.doi.org/10.1002/chem.202200843
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