氮氧自由基研究(ⅩⅩⅢ)——哌啶氮氧自由基及其氧铵盐与N,N,N′,N′-四甲基对苯二胺在水溶液中的单电子转移反应

ESR波谱和流动-停止UV动力学研究表明,水溶液中2,2,6,6-四甲基-4-羟基哌啶-1-氧自由基1和相应氧铵澳盐2均可将N,N,N′,N′-四甲基对苯二胺(TMPD)氧化为相应自由基正离子TMPD+,2还能将TMPD+进一步氧化为二价正离子TMPD^(2+).TMPD+可发生可逆歧化,其稳定性强烈受介质酸碱性的影响。利用计算机对动力学曲线的模拟测得上述有关反应的速率常数,并讨论了反应机理。

ELECTRON TRANSFER REACTIONS BETWEEN NAD(P)H MODEL COMPOUND AND N, N, N', N'-TETRAALKYL p-PHENYLENEDIAMINE RADICAL CATIONS

Studies on the mechanism of the reactions involving coenzyme NAD(P)H and its model compounds are of considerable significance for understanding the role and the mechanism of this coenzyme in living cells. Although there have been extensive studies on the mechanism of hydride transfer for NADH and its models, a

STUDIES ON NITROXIDES(ⅩⅣ)——REDOX REACTION OF 2,2,6,6-TETRAMETHYL-4-HYDROXYPIPERIDINE NITROXIDE AND GLUTATHIONE

Recently, it was found in this laboratory that nitroxide is an oxidant for some biologically active substances, e. g., ascorbic acid and cysteine, and some mechanistic studies involving electron transfer have been reported. In this letter we wish to report a detailed study on the redox reaction between 2,2,6, 6-tetramethyl-4-hydroxypiperidine nitroxide (Ⅰ)

STUDIES ON NITROXIDES——KINETICS AND MECHANISM OF THE REACTION BETWEEN GLUTATHIONE AND 2,2,6,6-TETRAMETHYL-4-HYDROXYPIPERIDINE-1-OXYL RADICAL IN ALKALINE BUFFER

Studies on the protective action of glutathione (1) via the destruction of free radicals in biological system are of great significance. The authors have previously reported the reaction of glutathione with 2,2, 6,6-tetramethyl-4-hydroxypiperidine-1-