Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-ohsawa 1-1, Hachiohji, Tokyo 192-0397, Japan.
Langmuir. 2013 Feb 12;29(6):1748-53. doi: 10.1021/la305148j. Epub 2013 Feb 1.
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.
已制备出由阳离子有机穴（主体）、中性芳香分子（客体）和阴离子粘土纳米片组成的超分子主客体组装体，并证明在这种排列中可以发生有效的单重态-单重态能量转移。该系统的新颖之处在于使用了阳离子有机穴，使得中性有机分子能够置于阴离子皂石纳米片上。通过稳态和时间分辨发射研究证明，位于皂石纳米片上的阳离子有机穴（八胺）内的中性芘和 2-乙酰蒽之间能够发生有效的单重态-单重态能量转移。高效率是通过抑制聚集、分离和自荧光猝灭来实现的。我们相信，使用新型超分子组装体进行的研究扩展了可作为有效能量转移系统候选物的分子类型，例如在人工光捕获系统中。
