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Very recently, it was reported that 9,10-bis(p-alkoxystyryl) anthracences only with sufficient long alkyl chains (decyl, undecyl and dodecyl) are effective PFC materials;10i in contrast, the shorter alkyl-containing 9,10-bis[(N-alkylcarbazol-3-yl)vinyl] anthracenes show more remarkable PFC behaviour.13 These two forms of chain length-dependent PFC behaviour underline not only the complexity of the structure–property relationship of PFC materials but also the signicant effect of the nature ofend-arylenes and substituents at the aryl rings on the solidstate fluorescence and piezochromic luminescence of 9,10- bis(arylvinyl)anthracene derivatives. To further understand this phenomenon and develop new PFC materials, in the current work, we have designed and synthesized some AIE-active 9,10- bis[(9,9-dialkyluorene-2-yl)vinyl]anthracenes with propyl, pentyl and dodecyl as side alkyl chains (FLA-Cn, Scheme 1) to investigate their fluorescence properties. We report here that FLA-Cn not only exhibit chain length-dependent PFC behaviour, in that longer alkyl-containing FLA-Cn show larger spectral shifts, but also the fluorescence color and emission of ground FLA-C12 solid can recover spontaneously at room temperature. |
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yhc0316: 金币+50, 翻译EPI+1 2014-10-19 14:11:38
yhc0316: 金币+50, 翻译EPI+1 2014-10-19 14:11:38
| 最近，据报道，9,10 - 双（对 - 烷氧基苯乙烯基）蒽只有具有足够长的烷基链（癸基，十一烷基和十二烷基）时才是有效的PFC材料【10】与此相对，9,10-双[（N-烷基咔唑-3 - 基）乙烯基]蒽含有更短的烷基链时具有更卓越的PFC性能【13】。这两种形式的链长依赖性的PFC性能不仅说明了PFC材料的结构 - 性能关系的复杂性，而且末端亚芳基和芳环上的取代基的性质对9,10-二（芳基乙烯基）蒽衍生物固态荧光和压致变色发光的显著影响。为了进一步理解这种现象，并开发新的PFC材料，在本工作中我们设计并合成了一些AIE活性9,10-双[（9,9 - 二烷基芴-2 - 基）乙烯基]蒽和丙基，戊基和十二烷基作为侧烷基链（FLA-Cn，方案1），以研究它们的荧光性质。我们在本文报告，FLA-Cn不仅具有链长度依赖性PFC性能，因为FLA-Cn中烷基链越长，光谱移位越大，而且荧光色和研磨FLA-C12的固态发光可在室温下自发地恢复。 |
2楼2014-10-19 09:16:53
