Xu Jiang-Fei, Huang Zehuan, Chen Linghui, Qin Bo, Song Qiao, Wang Zhiqiang, Zhang Xi
Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China.
ACS Macro Lett. 2015 Dec 15;4(12):1410-1414. doi: 10.1021/acsmacrolett.5b00831. Epub 2015 Dec 7.
We report a new method for fabricating supramolecular polymers with controlled structure and molecular weight through reversible conformational modulation. To this end, the crown-ether-based "taco complex" was introduced. We prepared a monomer containing a bis(-phenylene)-32-crown-10 in the core, which can supramolecularly polymerize efficiently in solution. When the conformation of the crown ether core was folded into a taco complex, the linear supramolecular polymerization could be significantly depressed, thus decreasing the molecular weight of the supramolecular polymer. In addition, extracting the depolymerizing agent with aqueous solution of cucurbit[7]uril could disassociate the taco complex and regenerate the supramolecular polymer with molecular weight as high as before. It is anticipated that this study can provide a facile and general methodology for controllable supramolecular polymerization.
我们报道了一种通过可逆构象调制制备具有可控结构和分子量的超分子聚合物的新方法。为此，引入了基于冠醚的“玉米卷配合物”。我们制备了一种核心含有双（亚苯基）-32-冠-10的单体，其在溶液中能高效地进行超分子聚合。当冠醚核心的构象折叠成玉米卷配合物时，线性超分子聚合会受到显著抑制，从而降低超分子聚合物的分子量。此外，用葫芦[7]脲水溶液萃取解聚剂可以使玉米卷配合物解离，并再生出分子量与之前一样高的超分子聚合物。预计这项研究可为可控超分子聚合提供一种简便通用的方法。
