| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2024-08-14 |
| タイトル |
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タイトル |
Water-Induced Regeneration of a 2,2-Diphenyl-1-picrylhydrazyl Radical after Its Scandium-Ion Promoted Electron-Transfer Disproportionation in an Aprotic Medium |
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言語 |
en |
| 言語 |
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|
言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Nakanishi Ikuo
Shoji Yoshimi
Ohkubo Kei
Ito Hiromu
Fukuzumi Shunichi
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
A neutral, stable radical, 2,2-diphenyl-1-picrylhydrazyl radical (DPPH?), has been frequently used to estimate the activity of antioxidants for more than 60 years. However, the number of reports about the effect of metal ions on the reactivity of DPPH? is quite limited. We have recently reported a unique electron-transfer disproportionation of DPPH? to produce the DPPH cations (DPPH+) and anions (DPPH-) upon the addition of scandium triflate [Sc(OTf)3 (OTf = OSO2CF3)] to an acetonitrile (MeCN) solution of DPPH?. The driving force of this reaction is suggested to be an interaction between DPPH- and Sc3+. In this study, it is demonstrated that the addition of H2O to the DPPH?-Sc(OTf)3 system in MeCN resulted in an increase in the absorption band at 519 nm due to DPPH?. This indicated that an electron-transfer comproportionation occurred to regenerate DPPH?. The regeneration of DPPH? was also confirmed by electron paramagnetic resonance (EPR) spectroscopy. The amount of DPPH? increase with an increasing amount of added H2O to reach a constant value. The detailed mechanism of regeneration of DPPH? was proposed based on the detailed spectroscopic and kinetic analyses, in which the reaction of DPPH+ with [(DPPH)2Sc(H2O)3]+ generated upon the addition of H2O to [(DPPH)2Sc]+ is the rate-determining step. |
| 書誌情報 |
Molecules
巻 28,
号 13,
p. 5002,
発行日 2023-06
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| 出版者 |
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出版者 |
Multidisciplinary Digital Publishing Institute |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
1420-3049 |
| PubMed番号 |
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識別子タイプ |
PMID |
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関連識別子 |
37446663 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.3390/molecules28135002 |
