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糖太甜521

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The AIE effect of DMCS-TPA was examined in THF–water mixtures via UV-vis absorption and PL spectra (Fig. S4 and S5†.The absorption spectra of DMCS-TPA are slightly affected with water fractions below 40%. When the water content increased to 50%, the maximum absorption dropped abruptly with a rise in the shoulder around 430 nm and the long tail region, indicating the formation of DMCS-TPA nano-aggregates. Meanwhile, the maximum absorption wavelength shows a minor red shift from 347 nm to around 355 nm, which might arise from the extended p-conjugation in aggregates. Correspondingly, the fluorescence strengthened dramatically above 50% of water addition. The PL intensity continuously enhanced with increasing water content to 80%, leading to resultant intensity more than 10 fold larger
than that of pure THF solution.
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糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-15 11:15:48
紫外 - 可见吸收和光致发光光谱研究了DMCS-TPA在THF-水的混合物的AIE作用(图S4和S5†)。当水的比例在40%以下时,DMCS-TPA的吸收光谱稍微受到影响。当水含量增加至50%时,最大吸收急剧下降,而且在430 nm附近出现一肩峰并有长尾区域的升高,表明有DMCS-TPA纳米聚集体的形成。同时,最大吸收波长出现轻微的红移,从347纳米到355纳米左右,这可能聚集体中偶联物的扩展所致。与此相应的,在水的比例超过50%时荧光显著增强。随水含量增高直至80%,PL强度不断增强,所得的强度是纯THF溶液的10倍。
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