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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen
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Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen

机译：通过Cavitand封装提高重原子效果：氧气存在下芘的室温磷光

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摘要

A deep cavitand is used to encapsulate the aromatic molecule pyrene in its interior while also binding Tr ions with its terminal carboxylates. Steady-state and time-resolved spectroscopic experiments, along with quantum yield measurements, quantify the enhancements of intersystem crossing and room temperature phosphorescence due to cavitand encapsulation. These results are compared to those obtained for pyrene contained in sodium dodecyl sulfate micelles, which is the usual system used to generate room temperature phosphorescence. The combination of selective binding and strong Tr recognition by the cavitand enhances the intersystem crossing and decreases the phosphorescence radiative lifetime from similar to 30 to 0.23 s. The cavitand also decreases the rate of O-2 quenching by a factor of 100. Together, these factors can boost the room temperature phosphorescence signal by several orders of magnitude, allowing it to be detected in water without O-2 removal. Host:guest recognition provides a route to molecular-scale triplet emitters that can function under ambient conditions.
机译：深型空腔用于将芳族分子芘在其内部包封，同时还将Tr离子与其末端羧酸盐结合。稳态和时间分辨的光谱实验以及量子产量测量，量化由于空腔封装引起的间隙交叉和室温磷光的增强。将这些结果与芘含有十二烷基硫酸钠胶束所含的结果进行比较，这是用于产生室温磷光的常用系统。 CAVITAST的选择性结合和强TR识别的组合增强了间接交叉，并降低了与30至0.23秒相似的磷光辐射寿命。 CavityAd还将O-2淬火的速率降低100倍。在一起，这些因素可以通过几个数量级提高室温磷光信号，使其在没有O-2的情况下在水中检测到。主持人：客户识别提供了可以在环境条件下运行的分子级三联发射器的路线。

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