SUBPICOSECOND TRANSIENT ABSORPTION STUDIES OF THE PHOTOCYCLOREVERSION OF AN AROMATIC ENDOPEROXIDE
SUBPICOSECOND TRANSIENT ABSORPTION STUDIES OF THE PHOTOCYCLOREVERSION OF AN AROMATIC ENDOPEROXIDE
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芳香族内过氧化物光环转化的亚皮秒瞬态吸收研究
DOI：
10.1021/j100376a016
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
H. Brauer
中科院分区：
文献类型：
--
作者：
N. Ernsting;R. Schmidt;H. Brauer
本文用瞬态吸收光谱法研究了内过氧化物二甲基高钴二蒽酮的光还原反应。结果是一致的，目前的模型，假设一个两步的过程。在第一步中，在0.35ps的时间分辨率内，内过氧化物的反应性S3（ππ 8）状态中的单个C-0键的均裂断裂发生。因此，形成了瞬时双自由基，它以1.6±0.5 ps的寿命热衰变（在22 ° C的二氯甲烷中），产生基态高铜杂蒽酮和单线态氧
The photocycloreversion of the endoperoxide of dimethylhomoeocoerdianthrone has been studied by transient absorption spectroscopy. The results are consistent with the current model which assumes a two-step process. In the first step, homolytic rupture of a single C-0 bond in the reactive S 3 (ππ ≡ 8) state of the endoperoxide takes place within the time resolution of 0.35 ps. Thus a transient biradical is formed, which decays thermally with a lifetime of 1.6±0.5 ps (at 22 o C in dichloromethane), to yield ground-state homoeocoerdianthrone and singlet oxygen