Key Laboratory of Materials Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Key Laboratory of Materials Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
Proc Natl Acad Sci U S A. 2022 Mar 1;119(9). doi: 10.1073/pnas.2121746119.
Issues of molecular weight determination have been central to the development of supramolecular polymer chemistry. Whereas relationships between concentration and optical features are established for well-behaved absorptive and emissive species, for most supramolecular polymeric systems no simple correlation exists between optical performance and number-average molecular weight (). As such, the of supramolecular polymers have to be inferred from various measurements. Herein, we report an anion-responsive supramolecular polymer [M1·Zn(OTf)] that exhibits monotonic changes in the fluorescence color as a function of Based on theoretical estimates, the calculated average degree of polymerization (DP) increases from 16.9 to 84.5 as the monomer concentration increases from 0.08 mM to 2.00 mM. Meanwhile, the fluorescent colors of M1 + Zn(OTf) solutions were found to pass from green to yellow and to orange, corresponding to a red shift in the maximum emission band ( ). Therefore, a relationship between DP and could be established. Additionally, the anion-responsive nature of the present system meant that the extent of supramolecular polymerization could be regulated by introducing anions, with the resulting change in being readily monitored via changes in the fluorescent emission features.
分子量测定问题一直是超分子聚合物化学发展的核心。对于行为良好的吸收性和发光性物质，浓度与光学特性之间的关系已经确立，但是对于大多数超分子聚合物体系，光学性能与数均分子量（）之间没有简单的相关性。因此，超分子聚合物的必须从各种测量中推断出来。在这里，我们报告了一种阴离子响应的超分子聚合物[M1·Zn(OTf)]，其荧光颜色随着的单调变化而变化。基于理论估算，当单体浓度从 0.08 mM 增加到 2.00 mM 时，计算得到的平均聚合度（DP）从 16.9 增加到 84.5。同时，发现 M1 + Zn(OTf)溶液的荧光颜色从绿色变为黄色，再变为橙色，相应的最大发射带（）发生红移。因此，可以建立 DP 与的关系。此外，本体系的阴离子响应性质意味着超分子聚合的程度可以通过引入阴离子来调节，通过荧光发射特性的变化可以很容易地监测到的变化。
