Development of Novel Photoresponsive Systems Using an Excimer State

我们已经展示了目前的项目，即1，n-bis（3-（1-pyrenyl）propyl-carboxy）-oxaalkanes（DP 3 n： n= 3至6），以及含有pyrenyl组的线性寡乙基，在它们受到辐射时，捕获和运输的金属更加有效。两个终端吡啶基组链接在一起形成一个当紫外光辐射时的刺激，并且这个结构与皇冠以太的相似。Thus， we refer to them as "photo-induced crown ether compounds" （PIC's）。这是第一个使用刺激来修复分子结构的工作。在目前的工作中，我们使用8种化合物提出了PIC的概念，即DP 3 n和7种金属具有不同的尺寸，并测试了PIC尺寸之间的关系和它们捕获的金属。We employed a quartz cell （1 cm × 2. 5 cm × 7 cm high） with a partition to determine the am\of metal ions transported by PIC molecules in the presence and absence of uv light， after a method for measuring transportation yield of metal ions by crown ethers。顺便说一下，DP 35和DP 34传输了最大的销售量。of CaイイD12+イエD1 and CdイD12+イエD1， respectively。We assume that DP3n molecules do not start with capturing metalions after forming an excimer， but rather they have some interaction with ions being excited， because some specific interactions were observed through y y D11 y D1H-NMR measurements when Ca y D12+ y D1 and Cd y D12+ y D1 were added into the solution of DP35 and DP34。在吡啶基末端组之间的非分子刺激物形成被认为是在非常严重地受到辐射时使PIC的绑定金属。最后，一个由光诱导的冠以太化合物组成的新颖概念已被成功地确定为正确和有用的，以开发对光敏感的系统。

We have Shown through the present project that 1,n-bis(3-(1-pyrenyl)propyl-carboxy)-oxaalkanes (DP3n: n= 3 to 6), linear oligooxyethylenes with pyrenyl groups at both ends, captured and transported metal ions more effectively when they were irradiated. Two terminal pyrenyl groups link together to form an excimer when irradiated with uv light, and this structure is analogous to that of crown ethers. Thus, we refer to them as "photo-induced crown ether compounds" (PIC's). It is the first work to use an excimer to fix a conformation of a molecule. In the present work, we proved the concept of PIC by using 8 compounds such as DP3n and 7 metal ions having different sizes, and examined the relationship between the sizes of PIC's and the metal ions captured by them. We employed a quartz cell (1cm × 2.5cm × 7cm high) with a partition to determine the amount of metal ions transported by PIC molecules in the presence and absence of uv light, after a method for measuring transportation yield of metal ions by crown ethers. Consequently, DP35 and DP34 transported the greatest amount. of CaィイD12+ィエD1 and CdィイD12+ィエD1, respectively. We assume that DP3n molecules do not start with capturing metal ions after forming an excimer, but rather they have some interaction with ions before being excited, because some specific interactions were observed through ィイD11ィエD1H-NMR measurements when CaィイD12+ィエD1 and CdィイD12+ィエD1 were added into the solution of DP35 and DP34. The intramolecular excimer formation between the pyrenyl end groups is considered to make PIC's bind metal ions very tightly when irradiated. Finally the novel concept of a photo-induced crown ether compound is successfully established to be correct and useful for developing the photo-responsible system.