Control of intramolecular excimer emission in luminophore-integrated ionic POSSs possessing flexible side-chains
Control of intramolecular excimer emission in luminophore-integrated ionic POSSs possessing flexible side-chains
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DOI：
10.1039/c8qm00181b
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发表时间：
2018-08-01
影响因子：
7
通讯作者：
Chujo, Yoshiki
中科院分区：
文献类型：
--
作者：
Narikiyo, Hayato;Gon, Masayuki;Chujo, Yoshiki
将萘、蒽和芘等多环芳烃集成到具有柔性离子连接体的多面体低聚倍半硅氧烷（POSS）上，并评估了它们的发光性能。最初，从包括每种修饰 POSS 的稀释溶液中观察到显着的准分子发射。研究发现，通过柔性连接器连接到刚性核心，有利于 POSS 单元周围准分子的形成。特别是，发光特性根据溶剂极性而发生巨大变化。表明通过在侧链中引入离子基团可以调节侧链之间的空间距离。此外，通过添加两亲性阴离子和聚阴离子化合物可以控制改性POSS在水溶液中的发光性能。最后将该系统应用于河流污染常规指标十二烷基硫酸钠(SDS)的检测。这些数据表明 POSS 周围侧链之间的分子内相互作用受到环境因素的动态控制。因此，获得了刺激响应性发光材料。
Polycyclic aromatic hydrocarbons such as naphthalene, anthracene and pyrene were integrated onto polyhedral oligomeric silsesquioxanes (POSSs) having flexible ionic linkers and their luminescence properties were evaluated. Initially, significant excimer emissions were observed from the diluted solutions including each modified POSS. It was found that excimer formation around the POSS unit was facilitated by connecting to the rigid core via the flexible linkers. In particular, the luminescence properties were drastically changed depending on the solvent polarity. It was indicated that the spatial distances between the side-chains can be regulated by introducing ionic groups into the side-chains. Furthermore, the luminescence properties in aqueous solution of the modified POSSs were controllable by adding amphiphilic anions and polyanionic compounds. Finally, this system was applied for the detection of sodium dodecyl sulfate (SDS) which is the conventional indicator of river pollution. These data indicate that intramolecular interaction between the side-chains around the POSS was dynamically controlled by environmental factors. Consequently, stimuli-responsive luminescent materials were obtained.