Self-assembly and aggregate-induced enhanced emission of amphiphilic fluorescence dyes in water and in the solid state.
Self-assembly and aggregate-induced enhanced emission of amphiphilic fluorescence dyes in water and in the solid state.
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DOI：
10.1002/asia.201000824
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
T. Hirose;Kenji Higashiguchi;K. Matsuda
中科院分区：
文献类型：
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作者：
T. Hirose;Kenji Higashiguchi;K. Matsuda
合成了一种含六乙二醇基团的1-氰基-1，2-二（联苯）乙烯（CNBE）衍生物，研究了其自组装特性和荧光性质。两亲性衍生物在水中和固态下均表现出聚集诱导增强发射（AIEE）。荧光量子产率随着聚集体刚性的增加而增加（即，在乙酸乙酯中<在水中<在固态下）。如从荧光光谱、荧光量子产率和荧光寿命的测量所确定的，增强发射的关键因素是抑制由受限分子运动引起的非辐射衰变过程。此外，发射速率常数的差异是不可忽略的，可以用来解释在水中和在固体状态下的荧光量子产率的差异。
1-Cyano-1,2-bis(biphenyl)ethene (CNBE) derivatives with a hexa(ethylene glycol) group as an amphiphilic side chain were synthesized and the self-assembling character and fluorescence behavior were investigated. The amphiphilic derivatives showed aggregate-induced enhanced emission (AIEE) in water and in the solid state. The fluorescence quantum yield increased as the rigidity of the aggregates increased (i.e., in ethyl acetate<in water<in the solid state). As determined from measurements of fluorescence spectra, fluorescence quantum yields, and fluorescence lifetimes, a key factor for the enhanced emission is suppression of the nonradiative decay process arising from restricted molecular motion. Additionally, the difference in the emission rate constant is not negligible and can be used to interpret the difference in fluorescence quantum yield in water and in the solid state.