Dendritic [2]Rotaxanes: Synthesis, Characterization, and Properties

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• 作者：Guoxing Liu ; Ziyong Li ; Di Wu ; Wen Xue ; Tingting Li ; Sheng Hua Liu ; Jun Yin
• 刊名：Journal of Organic Chemistry
• 出版年：2014
• 出版时间：January 17, 2014
• 年：2014
• 卷：79
• 期：2
• 页码：643-652
• 全文大小：544K
• ISSN：1520-6904

文摘

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.