Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen
Boosting the Heavy Atom Effect by Cavitand Encapsulation: Room Temperature Phosphorescence of Pyrene in the Presence of Oxygen
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DOI：
10.1021/acs.jpca.8b05813
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发表时间：
2018-08-16
影响因子：
2.9
通讯作者：
Bardeen, Christopher J.
中科院分区：
文献类型：
--
作者：
Easley, Connor J.;Mettry, Magi;Bardeen, Christopher J.
一个深的空腔被用来封装在其内部的芳香分子芘，同时也结合Tr离子与其终端羧酸。稳态和时间分辨光谱实验，沿着与量子产率测量，量化的增强系统间的交叉和室温磷光由于腔体封装。这些结果进行了比较，十二烷基硫酸钠胶束，这是通常的系统用于产生室温磷光中所含的芘。选择性结合和强烈的Tr识别的空穴的组合增强了系统间的交叉，并降低了磷光辐射寿命从类似的30到0.23秒。空穴还降低了100倍的O-2淬灭率。总之，这些因素可以将室温磷光信号提高几个数量级，使其能够在不去除O-2的情况下在水中检测到。主体：客体识别提供了一种在环境条件下可以发挥作用的分子级三重态发射体的途径。
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.