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首页> 外文期刊>Chemistry: A European journal >Thermal or Mechanical Stimuli-Induced Photoluminescence Color Change of a Molecular Assembly Composed of an Amphiphilic Anthracene Derivative in Water
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Thermal or Mechanical Stimuli-Induced Photoluminescence Color Change of a Molecular Assembly Composed of an Amphiphilic Anthracene Derivative in Water

机译：热或机械刺激引起的两亲蒽衍生物在水中的分子组装的光致变色

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摘要

Molecular assemblies that change photoluminescence color in response to thermal or mechanical stimulation without dissociation into the monomeric states in water are described herein. A dumbbell-shaped amphiphilic compound forms micellar molecular assemblies in water and exhibits yellow photoluminescence derived from excimer formation of the luminescent core, which contains a 2,6-diethynylanthracene moiety. Annealing of the aqueous solution induces a photoluminescence color change from yellow to green (λ_(em, max)=558→525 nm). The same photoluminescence color change is also achieved by rubbing the yellowphotoluminescence-emitting molecular assemblies adsorbed on glass substrates with cotton wool in water. The observed green photoluminescence is ascribed to micelles that are distinct from the yellow-photoluminescence-emitting micelles, on the basis of transmission electron microscopy observations, atomic force microscopy observations, and dynamic light scattering measurements. We examined the relationship between the structure of the molecular assemblies and the photophysical properties of the anthracene derivative in water before and after thermal or mechanical stimulation and concluded that thermal or mechanical stimuli-induced slight changes of the molecular-assembled structures in the micelles result in the change in the photoluminescence color from yellow to green in water.
机译：本文描述了响应于热或机械刺激而改变光致发光颜色而没有在水中解离成单体状态的分子组装体。哑铃状的两亲化合物在水中形成胶束分子组装体，并显示出源自发光核的受激准分子形成的黄色光致发光，该发光核包含2，6-二乙炔基蒽。水溶液的退火引起从黄色到绿色的光致发光颜色变化（λ_（em，max）＝ 558→525nm）。通过在水中用水擦拭吸附在玻璃基板上的黄色发光分子组件，也可以实现相同的发光颜色变化。基于透射电子显微镜观察，原子力显微镜观察和动态光散射测量，观察到的绿色光致发光归因于不同于发射黄色光致发光的微团的微团。我们检查了分子组件的结构与蒽衍生物在水中的热物理或机械刺激前后的光物理性质之间的关系，并得出结论，热或机械刺激引起的胶束中分子组装结构的轻微变化导致了水中的光致发光颜色从黄色变为绿色。

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