Tian Yu-Kui, Wang Feng
Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Macromol Rapid Commun. 2014 Feb;35(3):337-43. doi: 10.1002/marc.201300742. Epub 2013 Dec 9.
Orthogonal self-assembly of multiple components represents an efficient strategy to afford hierarchical and multifunctional assemblies. Here, we demonstrate the orthogonal recognition behaviors between benzo-21-crown-7/secondary ammonium salt and terpyridine/metal ions (Fe(2+) or Zn(2+) ) recognition motifs. Main-chain supramolecular polymers are subsequently achieved via "one-pot" mixing of the three monomers together (heteroditopic monomer 1, homoditopic secondary ammonium salt monomer 2, and Fe(BF4 )2 •6H2 O or Zn(OTf)2 ), which are confirmed by (1) H NMR, UV-Vis, DOSY, and viscosity measurements. Moreover, different metal ions (Fe(2+) or Zn(2+) ) exert considerable effects on the size of the resulting supramolecular polymers. Integration of two different types of non-covalent interactions renders dynamic and responsive properties for the resulting supramolecular polymers, as triggered by a variety of external stimuli such as temperature, potassium cation, as well as stronger chelating ligands. Therefore, the current work is a prerequisite for the future application of such orthogonal assemblies as intelligent supramolecular materials.
多种组分的正交自组装是构建具有层次结构和多功能的组装体的有效策略。在此，我们展示了苯并 - 21 - 冠 - 7/仲铵盐与三联吡啶/金属离子（Fe(2+) 或 Zn(2+) ）识别基序之间的正交识别行为。随后通过将三种单体（异双位点单体1、同双位点仲铵盐单体2和Fe(BF4 )2 •6H2 O或Zn(OTf)2 ）“一锅法”混合制备了主链超分子聚合物，这通过 (1)H NMR、紫外 - 可见光谱、扩散排序谱和粘度测量得到证实。此外，不同的金属离子（Fe(2+) 或 Zn(2+) ）对所得超分子聚合物的尺寸有显著影响。两种不同类型非共价相互作用的整合赋予了所得超分子聚合物动态和响应特性，这些特性可由多种外部刺激引发，如温度、钾阳离子以及更强的螯合配体。因此，当前的工作是此类正交组装体未来作为智能超分子材料应用的前提条件。
