Full metadata record
DC Field | Value | Language |
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dc.contributor.author | Shunichi Fukuzumi | * |
dc.date.accessioned | 2016-08-28T12:08:12Z | - |
dc.date.available | 2016-08-28T12:08:12Z | - |
dc.date.issued | 2011 | * |
dc.identifier.issn | 1463-9076 | * |
dc.identifier.other | OAK-7297 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/221375 | - |
dc.description.abstract | Superoxide ion (O 2 -) forms a stable 1:1 complex with scandium hexamethylphosphoric triamide complex [Sc(HMPA) 3 3+], which can be detected in solution by ESR spectroscopy. Electron transfer from O 2 --Sc(HMPA) 3 3+ complex to a series of p-benzoquinone derivatives occurs, accompanied by binding of Sc(HMPA) 3 3+ to the corresponding semiquinone radical anion complex to produce the semiquinone radical anion-Sc(HMPA) 3 3+ complexes. The 1:1 and 1:2 complexes between semiquinone radical anions and Sc(HMPA) 3 3+ depending on the type of semiquinone radical anions were detected by ESR measurements. This is defined as Sc(HMPA) 3 3+-coupled electron transfer. There are two reaction pathways in the Sc(HMPA) 3 3+-coupled electron transfer. One is a stepwise pathway in which the binding of Sc(HMPA) 3 3+ to semiquinone radical anions occurs after the electron transfer, when the rate of electron transfer remains constant with the change in concentration of Sc(HMPA) 3 3+. The other is a concerted pathway in which electron transfer and the binding of Sc(HMPA) 3 3+ occurs in a concerted manner, when the rates of electron transfer exhibit first-order and second-order dependence on the concentration of Sc(HMPA) 3 3+ depending the number of Sc(HMPA) 3 3+ (one and two) bound to semiquinone radical anions. The contribution of two pathways changes depending on the substituents on p-benzoquinone derivatives. The present study provides the first example to clarify the kinetics and mechanism of metal ion-coupled electron-transfer reactions of the superoxide ion. © the Owner Societies 2011. | * |
dc.language | English | * |
dc.title | Stepwise vs. concerted pathways in scandium ion-coupled electron transfer from superoxide ion to p-benzoquinone derivatives | * |
dc.type | Article | * |
dc.relation.issue | 8 | * |
dc.relation.volume | 13 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 3344 | * |
dc.relation.lastpage | 3352 | * |
dc.relation.journaltitle | Physical Chemistry Chemical Physics | * |
dc.identifier.doi | 10.1039/c0cp00916d | * |
dc.identifier.wosid | WOS:000287041700041 | * |
dc.identifier.scopusid | 2-s2.0-79951481966 | * |
dc.author.google | Kawashima T. | * |
dc.author.google | Ohkubo K. | * |
dc.author.google | Fukuzumi S. | * |
dc.contributor.scopusid | Shunichi Fukuzumi(35430038100;58409757400) | * |
dc.date.modifydate | 20240401081001 | * |