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Dismutation of 2,2-Diphenyl-1-picrylhydrazyl Radical Catalyzed by Lewis and Bronsted Acids
https://repo.qst.go.jp/records/71064
https://repo.qst.go.jp/records/71064ade871d1-dbc6-40fb-80ec-7179059eb917
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2013-03-14 | |||||
| タイトル | ||||||
| タイトル | Dismutation of 2,2-Diphenyl-1-picrylhydrazyl Radical Catalyzed by Lewis and Bronsted Acids | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Kawashima, Tomonori
× Kawashima, Tomonori× Nakanishi, Ikuo× Ohkubo, Kei× Fukuzumi, Shunichi× Ozawa, Toshihiko× Matsumoto, Kenichiro× 川島 知憲× 中西 郁夫× 松本 謙一郎 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Dismutation of superoxide is a primary scavenging reaction of reactive oxygen species (ROS) using the metalloprotein, superoxide dismutase (SOD). SOD is known to contain redox active metal ions, such as Mn, Cu-Zn, and Fe, in its active center. However, there are few reports about dismutation of free radicals by redox-inactive metal ions. In this study, we report the dismutation of 2,2-diphenyl-1-picrylhydrazyl radical (DPPH radical) as an ROS model catalyzed by redox-inactive metal ions with Lewis acidity. In acetonitrile at ambient temperature, the absorption band at 519 nm due to DPPHradical was decreased by addition of Sc(OSO2CF3)3, which has a very strong Lewis acidity. In the case of Mg(ClO4)2 as a weaker Lewis acid than Sc3+, no consumption of DPPHradical was observed in the presence of Mg2+. On the other hand, upon addition of Mg(ClO4)2 with acetic acid, DPPHradical was quenched efficiently. In summary, a strong Lewis acid, Sc3+, can promote dismutation of DPPHradical, while protons are required for the dismutation of DPPHradical to occur in the presence of a weak Lewis acid, Mg2+. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | International Free Radical Winter School in Muikamachi | |||||
| 発表年月日 | ||||||
| 日付 | 2013-03-13 | |||||
| 日付タイプ | Issued | |||||
