Photochromic Color Change of the Dimer of Triphenylimidazolyl at Low Temperatures
Photochromic Color Change of the Dimer of Triphenylimidazolyl at Low Temperatures
复制标题
三苯基咪唑二聚体低温光致变色
DOI：
10.1246/bcsj.42.3509
复制
发表时间：
1969
影响因子：
4
通讯作者：
Taro Hayashi
中科院分区：
文献类型：
--
作者：
K. Maeda;Taro Hayashi
三苯基咪唑的光致变色二聚体是由三苯基咪唑氧化得到的两种二聚体之一，在室温至−196°C的温度下，在溶液和固态下都显示出光致变色。在高于约-20 °C的温度下，溶液中的光致变色颜色是红紫色，在低于约-150 °C的温度下，颜色是蓝紫色，并且在中间低温下，光致变色颜色不出现。随着温度的变化，样品的吸收光谱和ESR随颜色的变化而变化。固态的光致变色颜色在约-70 °C以上为浅红紫色，在-196 °C为蓝紫色。结合室温下的光致变色机理以及光谱和ESR研究结果讨论了变色机理。
The photochromic dimer of triphenylimidazolyl which is one of two dimers obtained by oxidation of triphenylimidazole shows photochromism at temperatures between room temperature and −196°C in solutions and in a solid state. At temperatures higher than about −20°C the photochromic color in solutions is reddish-purple, at temperatures lower than about −150°C the color is bluish-purple and at intermediate low temperatures the photochromic color does not appear. Absorption spectrum and ESR measured with the change of temperature showed variations corresponding to the change of color. The photochromic color in a solid state was light reddish-purple above about −70°C and bluish-purple at −196°C. The mechanism of the color change was discussed in connection with that of the photochromism at room temperature and the results obtained from spectroscopic and ESR studies.