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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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huang666684 
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| Picture 1 is the UV-Vis absorption spectra of DT-1 in hexane solution(C=5.0mol/L).The short lines in the picture is the absorption spectra for open-loop state. The solid line is for the steady-state and the point line for close-loop state. In hexane solution, the maximum absorption wavelength at open-loop state DT-1 (a) is 272nm. Under the irradiation of the UV at a wavelength of 254nm, the colorless solution turned into blue. The absorbance at the maximum absorption wavelength became weaker and weaker as irradiation time grows. While between wavelengths of 400nm to 700nm, an especially strong wide absorption appeared and become stronger and stronger. The corresponding close-loop DT-1(b) generated (structure refers to scheme 1) with a maximum absorption wavelength of 575nm. Under the irradiation of a visible light with an appropriate wavelength (λ>500 nm), the colored state can return to colorless state. Under the irradiation of visible lights with wavelength between 400nm to 700nm, the featured absorption light at closed-loop state disappeared completely and the maximum absorption wavelength in UV region returned to 272nm. This shows that DT-1(b) changed back to DT-1(a), and so repeatedly colored and faded for dozens of times, the absorption point in both open-loop state and closed-loop state can be observed respectively at wavelength 295nm. This shows that this compound has the excellent fatigue-resistance character in hexane solution. The dynamics of photo chromic character as well as its security application in nano-fibers an so on of this compound will be further studied. |
6楼2008-02-17 10:55:06
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fiw
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4楼2008-02-08 21:59:22
