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| 图1为DT-1在正已烷溶液（C=5.010-5 mol/L）中的UV-Vis吸收光谱.图中短线为开环态的吸收光谱，实线为光稳定态的吸收光谱，点划线为闭环态的吸收光谱. 在正己烷溶液中，开环态DT-1(a)的最大吸收波长为272 nm，在254 nm紫外光的照射下，溶液由无色变成了蓝色. 随着照射时间的不断增长，开环态DT-1(a)的最大吸收波长处的吸光度逐渐减弱；同时在400~700 nm波长区域出现一个很强的宽吸收，且强度逐渐增强，对应闭环态DT-1(b)的生成(其结构见scheme 1)，最大吸收波长为575 nm. 在适当波长可见光(λ>500 nm)照射下，有色态DT-1(b)又可以回复到无色状态时，在可见光区400~700 nm处，闭环态的特征吸收光完全消失，紫外区的最大吸收波长又回复到272 nm，这说明DT-1(b)均重新变为DT-1(a)，如此反复着/褪色数十次后，分别在295 nm处仍能观测到开环态和闭环态的等吸收点，表明这种化合物在正己烷溶液中具有很好的抗疲劳性. 关于此化合物的光致变色动力学特性及其在纳米纤维中的防伪应用等正在进一步的研究之中. |
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| Figure 1 shows UV-Vis absorption spectrum of DT-1 in hexane solution(C=5.0mol/L). In Fig.1, the short line is absorption spectrum of open-loop state, while those of steady-state and close-loop state are described as the solid line and the dot line seperately.The maximum absorption wavelength in open-loop state DT-1 (a) is 272nm in hexane solution. When the wavelength of UV is 254nm, the colorless solution becomes blue. As irradiation time increases. the absorbing intensity at the maximum absorption wavelength decreases in open-loop state DT-1 (a); Meanwhile, a strong wide absorption peak appeared in the range from 400nm to 700nm and its intensity increased with wavelength increasing, which the close-loop DT-1(b) was formed (the structure shown in scheme 1) with a maximum absorption wavelength of 575nm. The colorful state DT-1(b) can return to colorless by the irradiation of visible light with an appropriate wavelength (λ>500 nm.The characteristics of closed-loop state disappeared by the irradiation of visible lights with wavelength range of 400nm to 700nm, and the maximum absorption wavelength in UV region returned to 272nm.The above results show that DT-1(b) reverted to DT-1(a). Even though the operation was repeated ten times, the absorption characteristics of open-loop state and closed-loop state still can be observed at the wavelength of 295nm, which suggested that the compound has excellent fatigue-resistance in hexane solution. The photo-induced-color dynamics of the compound and its security application in nano-fibers are being studied. |
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