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将螺二芴引入二芳基乙烯分子中,设计合成了一种新型的含螺二芴呋喃芳香杂环的二芳基乙烯光致变色分子7a.用FT-IR,NMR,MS和元素分析进行结构表征;研究了7a在正己烷溶液和乙腈溶液中的光致变色反应,结果表明7a在两种溶剂中均具有良好的光致变色性能.并且7a在正己烷溶液中变色速率和转化率比在乙腈溶液中大.还研究了7a光致变色过程中荧光光谱的变化,发现关环反应后荧光被淬灭,并且7a的荧光发射峰在极性溶剂中有很大的蓝移.研究了开环态7a,关环态7b的热稳定性,发现7a的热失重温度比未用螺二芴修饰的8a提高了100℃.7b的热稳定性也比8b高.
The spirobifluorene was introduced into the diarylethene molecule to design and synthesize a novel diarylethene photochromic molecule 7a containing a spirobifluorene furan aromatic heterocycle. The results of FT-IR, NMR, MS and elemental analysis The photochromism of 7a in n-hexane solution and acetonitrile solution was studied and the results showed that 7a had good photochromic properties in both solvents and the rate of change of color and the conversion ratio of 7a in n-hexane In acetonitrile solution.Furthermore, the changes of fluorescence spectra in 7a photochromism were studied and it was found that the fluorescence was quenched after the ring-closing reaction and the fluorescence emission peak of 7a had a great blue-shift in the polar solvent. The thermal stability of the open-ring 7a, closed-ring 7b was found to increase the thermal weight-loss temperature of 7a by 100 ° C over 8a, which is not modified with spirobifluorene, and the thermal stability of 7B is also higher than that of 8b.