Time-Resolved ESR Studies on Photosensitized Reaction of Maleic Anhydride in Alcohols: CIDEP Memory Transfer in Spin-Adduct Formation
Time-Resolved ESR Studies on Photosensitized Reaction of Maleic Anhydride in Alcohols: CIDEP Memory Transfer in Spin-Adduct Formation
复制标题
醇中马来酸酐光敏反应的时间分辨 ESR 研究：自旋加合物形成中的 CIDEP 记忆转移
DOI：
10.1246/bcsj.65.1672
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
K. Kuwata
中科院分区：
文献类型：
--
作者：
K. Ohara;H. Murai;K. Kuwata
采用时间分辨电子自旋共振（ESR）方法研究了马来酸酐与醇的三重态光敏化反应以及后续的二次反应。考察并讨论了处于激发三重态的马来酸酐的C = C键位点的夺氢反应作为起始步骤。在马来酸酐与醇自由基之间的二次反应中形成的加合物自由基显示出特征性的E/A形超精细谱线。这种现象可以通过醇自由基的多重态（E/A）自旋极化的化学诱导动态电子极化（CIDEP）“记忆转移”到加合物自由基来解释。还估算了作为敏化剂的呫吨酮在2 - 丙醇和环己醇中激发三重态的自旋 - 晶格弛豫时间。
A triplet photosensitization reaction of maleic anhydride with alcohols and the subsequent secondary reaction were studied by a time-resolved ESR method. The hydrogen abstraction reaction of the C=C bond site of maleic anhydride in the excited triplet state was examined and discussed as the primary step. The adduct radical formed in the secondary reaction between maleic anhydride and alcohol radicals showed a characteristic E/A-shaped hyperfine line(s). This phenomenon can be explained by the CIDEP “memory transfer” of the multiplet (E/A) spin polarization of the alcohol radicals to the adduct radical. The spin-lattice relaxation times of the excited triplet state of xanthone as the sensitizer in 2-propanol and cyclohexanol were also estimated.