Chain decomposition of hydrogen peroxide induced by catalytic levels of reduced 5-methylphenazinium and metal ions: a nonclassical Fenton system
Chain decomposition of hydrogen peroxide induced by catalytic levels of reduced 5-methylphenazinium and metal ions: a nonclassical Fenton system
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还原的 5-甲基吩嗪鎓和金属离子的催化水平诱导过氧化氢的链式分解：非经典芬顿系统
DOI：
10.1021/ja00381a021
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发表时间：
1982
影响因子：
15
通讯作者：
W. Waddell
中科院分区：
文献类型：
--
作者：
H. Richter;W. Waddell
Catalytic levels of fully reduced 5-methylphenazinium (MPH) and metal ions induce a chain decomposition of H202 in N2-saturated aqueous benzoic acid solution, with concomitant production of o-, m-, andp-hydroxybenzoic acids. Theoxidant inducing the aromatic hydroxylations is the hydroxyl radical, produced in a one-electron, metal ion mediated reduction of H202. The rate of decomposition is zero order with respect to [H202] when the reaction is catalyzed by adventitious metal ions or by added Fe111 or Fe11. For Fe111 in citrate buffer, the rate expression is-d [H202]/dr= fc [MPH] 0 ([Feln] 0+ a) where k= 2.7 X 101 23 M" 1 s" 1 and a= 7.0 X 10~ 7 M. The reaction mechanism is essentially the same as for the classical Fenton system except that an added reducing agent is required to return theoxidized catalytic metal ion to its reduced state. Thus, the present system can be grouped with a number of other “nonclassical Fenton systems” such as the Udenfriend and Hamilton systems, which are capable of aromatic hydroxylations and which require both a catalytic metal ionand a reducing agent.It is well-known that addition of the 5-methylphenazinium cation (MP+) and reduced/3-nicotinamide adenine dinucleotide (NADH) to oxygenated aqueous solutions generates a species which can hydroxylate aromatic substrates. 1" 3 It is now clear that this reactive species is the hydroxyl radical (HO·) 2· 3 produced
