Efficient Singlet-Singlet Energy Transfer in a Novel Host-Guest Assembly Composed of an Organic Cavitand, Aromatic Molecules, and a Clay Nanosheet
Efficient Singlet-Singlet Energy Transfer in a Novel Host-Guest Assembly Composed of an Organic Cavitand, Aromatic Molecules, and a Clay Nanosheet
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DOI：
10.1021/la305148j
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发表时间：
2013-02-12
期刊：
影响因子：
3.9
通讯作者：
Ramamurthy, V.
中科院分区：
文献类型：
--
作者：
Ishida, Yohei;Kulasekharan, Revathy;Ramamurthy, V.
制备了由阳离子有机空穴(主体)、中性芳香族分子(客体)和阴离子粘土纳米片组成的超分子主客体组装，并证明在这种排列中可以发生有效的单重态能量转移。该系统的创新之处在于使用了阳离子有机空穴，使中性有机分子能够放置在阴离子皂石纳米片上。通过稳态和时间分辨发射研究，证明了阳离子有机空穴(辛胺)包裹在皂石纳米片上的中性芘和2-乙酰基菲之间有效的单重态能量转移。高效率是通过抑制聚集、分离和自荧光猝灭实现的。我们相信，这里提出的使用新型超分子组装的研究扩大了可以用作有效能量转移系统的候选分子的类型，例如在人造光收集系统中。
A supramolecular host guest assembly composed of a cationic organic cavitand (host), neutral aromatic molecules (guests), and an anionic clay nanosheet has been prepared and demonstrated that in this arrangement efficient singlet singlet energy transfer could take place. The novelty of this system is the use of a cationic organic cavitand that enabled neutral organic molecules to be placed on an anionic saponite nanosheet. Efficient singlet singlet energy transfer between neutral pyrene and 2-acetylanthracene enclosed within a cationic organic cavitand (octa amine) arranged on a saponite nanosheet was demonstrated through steady-state and time-resolved emission studies. The high efficiency was realized from the suppression of aggregation, segregation, and self-fluorescence quenching. We believe that the studies presented here using a novel supramolecular assembly have expanded the types of molecules that could serve as candidates for efficient energy-transfer systems, such as in an artificial light-harvesting system.