One-electron reactions of 1,5- and 1,8-dihydroxy-9, 10-anthraquinones. A pulse radiolysis study
作者:Haridas Pal、Dipak K. Palit、Tulsi Mukherjee、Jai. P. Mittal
DOI:10.1039/ft9918701109
日期:——
characteristics of the semiquinone free radicals formed by the one-electron reduction (using e–aq, CO˙–2 and CH3ĊOHCH3 as the reductant) as well as the oxidation (using OH˙, O˙– and N˙3 as the oxidants) of 1,5-dihydroxy-9, 10-anthraquinone (1,5-DHAQ) and 1,8-dihydroxy-9, 10-anthraquinone (1,8-DHAQ) have been studied by pulse radiolysis in pure isopropyl alcohol and in aqueous solutions containing various
由单电子还原形成的半醌自由基的吸收特性(使用e -水溶液,CO ˙- 2和CH 3 ĊOHCH 3作为还原剂)以及(使用OH,O-氧化-和N ˙ 3 1,5-二羟基-9,10-蒽醌(1,5-DHAQ)和1,8-二羟基-9,10-蒽醌(1,8-DHAQ)作为氧化剂已通过脉冲辐射分解法研究异丙醇和水溶液中含有各种适当的添加剂。还原的半醌的第一酸解离常数测量为p K a对于1,5-DHAQ和1,8-DHAQ分别为3.65和3.95。已经确定了各种形成和衰变反应的二阶速率常数。在pH 11下确定单电子还原电位(相对于NHE),因为E 1 11 = –350 mV(对于1,5-DHAQ)和E 1 11 = –377 mV(对于1,8-DHAQ),分别。讨论了与1,4-二羟基-9,10-蒽醌(quinizarin)的区别。