Görner Helmut
Max-Planck-Institut für Bioanorganische Chemie, D-45413, Mülheim an der Ruhr, Germany.
Photochem Photobiol Sci. 2006 Nov;5(11):1052-8. doi: 10.1039/b606968a. Epub 2006 Aug 24.
The photolysis of 9,10-anthraquinone (AQ), 2-methyl- and 2,3-dimethyl-AQ was studied in air-saturated acetonitrile-water in the presence of various donors: formate, ascorbic acid, alcohols, e.g. 2-propanol or methanol, and amines, e.g. ethylenediaminetetraacetate (EDTA). The photoreaction is initiated by H-atom or electron transfer from the donor to the AQ triplet state. The conversion of oxygen into hydrogen peroxide occurs via the superoxide radical and its conjugate acid. The quantum yield of oxygen uptake (Phi(-O2)) increases with increasing donor concentration. Phi(-O2) = 0.3-0.6 in the presence of 1 M 2-propanol and 3-10 mM ascorbic acid or EDTA. The properties of the quinone and donor radicals involved and the pH and concentration dependences of Phi(-O2) are described.
在空气饱和的乙腈 - 水中，于各种供体（如甲酸、抗坏血酸、醇类，例如2 - 丙醇或甲醇，以及胺类，例如乙二胺四乙酸（EDTA））存在的情况下，研究了9,10 - 蒽醌（AQ）、2 - 甲基 - AQ和2,3 - 二甲基 - AQ的光解作用。光反应由供体向AQ三重态的氢原子或电子转移引发。氧气通过超氧自由基及其共轭酸转化为过氧化氢。氧气吸收的量子产率（Phi(-O2)）随供体浓度的增加而增加。在1 M 2 - 丙醇以及3 - 10 mM抗坏血酸或EDTA存在的情况下，Phi(-O2) = 0.3 - 0.6。描述了所涉及的醌和供体自由基的性质以及Phi(-O2)对pH值和浓度的依赖性。
