In situ Observation of Molecular Swapping in a Crystal by X-ray Analysis
In situ Observation of Molecular Swapping in a Crystal by X-ray Analysis
复制标题
通过 X 射线分析原位观察晶体中的分子交换
DOI：
10.1246/cl.2000.1372
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发表时间：
2000
影响因子：
1.6
通讯作者：
Y. Ohashi
中科院分区：
文献类型：
--
作者：
M. Kawano;T. Sano;J. Abe;Y. Ohashi
X射线衍射分析表明，一对六芳基联咪唑在低温照射下转化为由两个洛菲自由基和压电二聚体组成的复合物。压电二聚体的存在在光谱上被认为是不稳定的异构体，是通过两个光诱导的洛菲自由基的分子交换产生的，具有剧烈的构象变化。当加热至 25 °C 时，黑色晶体恢复到原来的结构。
X-ray diffraction analysis elucidated that a pair of hexaarylbiimidazoles was transformed to a complex composed of two lophyl radicals and a piezodimer on irradiation at low temperatures. The piezodimer, the existence of which has been assumed spectroscopically as an unstable isomer, was produced via molecular swapping of two photo-induced lophyl radicals with drastic conformational change. The black crystal reverted to the original structure on warming to 25 °C.