通常,单重态氧化学和光氧化反应通常需要一个或多个关键反应步骤,这些步骤涉及从单重态到三重态的系统间交叉,反之亦然。本文考虑了两个重要的系统间交叉机制,即电子自旋电子轨道(自旋轨道)耦合和电子自旋核自旋(自旋旋转)耦合,以及它们可能如何涉及:(1)使1 O 2失活至3 O 2 ; (2)在热催化下将3 O 2转化为1 O 2;(3)芳族内过氧化物的断裂,得到O 2和芳族底物。
investigate the spin polarization of a nitroxide free radical induced by interaction with singlet oxygen (1O2). The latter was generated by photolysis of endoperoxides of two anthracene derivatives. Although both anthracene endoperoxides are structurally similar, opposite spin polarization of the nitroxide was observed. Photolysis of one endoperoxide leads to absorptive nitroxide spin polarization due to interaction
时间分辨电子顺磁共振光谱,瞬态吸收和磷光光谱用于研究与单线态氧(1 O 2)相互作用引起的一氧化氮自由基的自旋极化。后者是通过两种蒽衍生物的内过氧化物的光解而产生的。尽管两种蒽内过氧化物在结构上相似,但观察到相反的氮氧化物自旋极化。一种内过氧化物的光解由于与生成的1 O 2相互作用而导致吸收型氮氧化物自旋极化。其他内过氧化物的光解会产生发射型氮氧化物自旋极化,这可能是由于内过氧化物三重态与氮氧化物的相互作用所致。
Mechanism of thermolysis of endoperoxides of aromatic compounds. Activation parameters, magnetic field, and magnetic isotope effects
作者:Nicholas J. Turro、Ming Fea Chow
DOI:10.1021/ja00414a029
日期:1981.12
nearly quantitative yields of /sup 1/O/sub2/. These two results are interpreted in terms of a diradical mechanism which leads to low yield of /sup 1/O/sub2/ and a concerted mechanism which leads to quantitative yields of /sup 1/O/sub2/, respectively. This interpretation is consistent with the observation of a magnetic fieldmore » effect on the yield of /sup 1/O/sub2/ from endoperoxides whose thermolyses