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zhangwei章薇

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Results and discussion
     General photophysical properties As expected, these cruciforms show the same absorption and emission spectra (Fig. 1a) and fluorescence quantum yields (F ¼ 10–12%) in THF solution because of their identical conjugated skeletons, indicating the N-alkyl chain lengths do not substantially affect their solution photophysical properties.
      However, it is noted that the F values of FCn in THF solution are obviously higher than those of the linear 9,10-distyrylanthracene derivatives whose solutions are weak or non-fluorescent. This implies that the non-radiative decay caused by the free intramolecular torsion of the two styryl moieties at the 9,10-positions of the anthracene core has been depressed in the cruciform configuration. As a result, FCn may show a weak AIE effect in aqueous media. This is evidenced by the emission spectra and uorescence images of FC4 in THF solution and a THF–water (1/9) mixture (Fig. 1b). The emission spectrum in aqueous media is slightly blueshifted relative to that in THF solution, and the ϕ value in the  aqueous dispersion is only about twice that in THF solution (inset in Fig. 1b)
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真强必胜: 金币+2 2014-09-29 08:21:04
zhangwei章薇: 金币+18, 翻译EPI+1 2014-09-29 14:17:21
结果与讨论
一般光物理性质。如所预期,在THF溶液中这些cruciforms具有同样的吸收光谱和发射光谱(图1A)和荧光量子产量 (F ¼ 10–12%),因为他们的共轭骨架是相同的,表明N烷基链长度对它们在液相中的光物理性质没有实质性影响。

但应当注意的是,在THF溶液中FCN的F值明显高于线性9,10 - 二苯乙烯基蒽衍生物,后者在液相中呈弱荧光或无荧光。这意味着,蒽核的9,10位的两个苯乙烯基团分子内的自由扭转引起的非辐射衰减在十字形结构中被抑制。其结果是FCN在液相介质中可能具有弱AIE效应。这是通过FC4在THF溶液和THF-水(1/9)混合物中的发光光谱和荧光图像证实的(图1b)。在液相介质中的发射光谱比在THF溶液中稍微向蓝偏移,并且在液相分散φ值大约只是在THF溶液中的两倍(图1b内的插图)
2楼2014-09-29 05:34:39
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