Liu Guoxing, Li Ziyong, Wu Di, Xue Wen, Li Tingting, Liu Sheng Hua, Yin Jun
Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University , Wuhan 430079, P.R. China.
J Org Chem. 2014 Jan 17;79(2):643-52. doi: 10.1021/jo402428y. Epub 2014 Jan 3.
A series of dendritic ammonium salts have been designed and synthesized. Subsequently, they were used to construct the corresponding [2]rotaxanes by a template-directed clipping approach. Unusually, two unsymmetrical dendritic [2]rotaxanes containing fluorophore (pyrene units) were also obtained; their optical properties, such as UV/vis absorption and fluorescence, were measured. The results indicate that these two rotaxanes possess stronger intermolecular interaction in the solid state than in solution. As a result, solutions of high concentration readily formed the excimer. These special rotaxanes might be applied in dynamic fluorescence-reponsive materials, and the rotaxane structure will also be used as a strategy to adjust the aggregated behaviors of fluorescent molecules.
设计并合成了一系列树枝状铵盐。随后，通过模板导向的剪裁方法，用它们构建了相应的[2]轮烷。不同寻常的是，还得到了两种含荧光团（芘单元）的不对称树枝状[2]轮烷；测量了它们的光学性质，如紫外/可见吸收和荧光。结果表明，这两种轮烷在固态下比在溶液中具有更强的分子间相互作用。因此，高浓度溶液很容易形成准分子。这些特殊的轮烷可能应用于动态荧光响应材料，并且轮烷结构也将作为一种策略来调节荧光分子的聚集行为。
