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Aggregation-induced emission (AIE) in THF–water mixtures To understand whether a water-nonsoluble conjugated organic molecule is AIE active, a simple and practical method is usually to add a large amount of water into the organic solution of the compound and record the changes of fluorescence intensity.14,15 FLA-Cn are highly soluble in common organic solvents, such as THF, dichloromethane, chloroform and toluene. Since water is the non-solvent for FLA-Cn, the molecules of FLA-Cn must have aggregated in THF–water mixtures with high water content like other 9,10-diarylvinylanthracene derivatives.10,13,15 The absorption and emission spectra of FLA-Cn in THF–water mixtures are shown in Fig. 1. FLA-Cn are AIE-active with weak fluorescence in molecularly dissolved solution with fluorescence quantum yields (F) of 3.8–4.9% but increased fluorescence intensities in aqueous suspensions with F of 21–29% at high water content (THF/water ¼ 1/9) (Fig. 1a–c). Because of the large internal steric hindrance between the 1,8-positions of the anthracene ring and the b-positions of the vinylene moieties, the conjugated backbone of 9,10-diaryl-vinylanthracene has been forced to twist strongly.10i,15a,b In molecularly dissolved solution, the intramolecular torsion motion is relatively free, which facilitates nonradiative relaxation pathways and affords weak fluorescence emission. However, in aqueous media, the intramolecular vibration and rotation are seriously restricted by molecular selfaggregation, causing the aqueous suspensions to exhibit strongly aggregation-induced emission. On the other hand, there are no significant differences for the absorption spectra of FLA-Cn in solution and aqueous suspension (Fig. 1d). This implies that the molecular stacking in aqueous media is probably loose. |
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yhc0316: 金幣+50, 翻譯EPI+1 2014-10-20 13:53:48
yhc0316: 金幣+50, 翻譯EPI+1 2014-10-20 13:53:48
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在THF-水混合物中的聚合誘導發(fā)光（AIE） 了解一種非水溶性共軛有機分子是否具有AIE活躍，一個簡單實用的方法通常是添加大量的水進入該化合物的有機溶液，并記錄熒光強度的變化【14,15】。 FLA-Cn在THF，二氯甲烷，氯仿和甲苯等在普通有機溶劑中具有高度可溶性。因為對FLA-Cn而言，水是在非溶劑，因此在THF-水混合物中FLA-Cn的分子必定發(fā)生高含水量聚合，就像其他9,10 - 二芳基乙烯基蒽衍生物一樣【10,13,15】。FLA-Cn在THF - 水混合物中的吸收和發(fā)光光譜見圖 1。FLA-Cn具有AIE活性，在分子溶解的溶液中有弱熒光，熒光量子產(chǎn)率（F）為3.8-4.9％，但在高水含量（THF：水 = 1：9）的水懸浮液中熒光強度增加，熒光量子產(chǎn)率（F）為21-29％（圖1a-c）。因為1,8位上的蒽環(huán)和β位置上的亞乙烯基團的之間的大的內(nèi)部空間位阻，9,10 - 二芳基 - 乙烯基蒽的共軛主鏈已被迫強烈扭曲【10i，15a，b】。在分子溶于溶液時，分子內(nèi)的扭轉(zhuǎn)運動是相對自由的，這促進了無發(fā)光弛豫途徑，并使其具有弱熒光發(fā)光。然而，在含水介質(zhì)中，分子內(nèi)的振動和轉(zhuǎn)動都嚴重受分子自聚集的限制，使水性懸浮液表現(xiàn)出強烈的聚合誘導發(fā)光。另一方面，F(xiàn)LA-Cn的吸收光譜在溶液和水懸浮液中沒有明顯差異（圖1d）。這意味著，在含水介質(zhì)中分子的堆疊可能是松散的。 |
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