Absorption Spectra of Dianthracene Anion Radical and Anthracene Dimer Anion
Absorption Spectra of Dianthracene Anion Radical and Anthracene Dimer Anion
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联蒽阴离子自由基和蒽二聚体阴离子的吸收光谱
DOI：
10.1063/1.1677618
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发表时间：
1972
影响因子：
4.4
通讯作者：
S. Iwata
中科院分区：
文献类型：
--
作者：
T. Shida;S. Iwata
在77°K下，二蒽在γ射线辐照的刚性醚溶液中与电离产生的移动的电子反应，生成一对蒽分子和阴离子，它们之间弱相互作用，形成二聚阴离子。二聚体阴离子表现出的光谱特征（i）在近红外区域的额外的分子间电荷共振带，（ii）相比，自由蒽分子和阴离子的减色性。所观察到的光谱的二聚体可以很好地占分子轨道计算的三明治结构的二聚体的假设。与移动的电子相反，具有较小动能的基质捕获电子与二蒽反应仅产生二蒽阴离子自由基，其在近红外区域显示出双重电荷共振带。该阴离子在热和光学上都是不稳定的，并且通过二聚体阴离子分裂成蒽分子和阴离子。
Dianthracene in γ‐irradiated rigid ethereal solutions at 77°K reacts with mobile electrons produced by ionization to give a pair of anthracene molecule and anion which interact weakly to constitute a dimer anion. The dimer anion exhibits spectral features of (i) an extra intermolecular charge resonance band in the near infrared region, (ii) hypochromism in comparison to the free anthracene molecule and anion. The observed spectrum of the dimer can be well accounted for by molecular orbital calculations with the assumption of a sandwich structure for the dimer. In contrast to the mobile electron the matrix‐trapped electron which has less kinetic energy reacts with dianthracene only to give dianthracene anion radicals which show doublet charge resonance bands in the near‐infrared region. The anion is unstable both thermally and optically, and splits to an anthracene molecule and an anion via the dimer anion.