Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences , Beijing 100190, P. R. China.
ACS Appl Mater Interfaces. 2014 Apr 23;6(8):5988-95. doi: 10.1021/am5011628. Epub 2014 Apr 11.
Developing water-stable and adaptive supramolecular materials is of great importance in various research fields. Here, we demonstrate a new kind of water-stable, adaptive, and electroactive supramolecular ionic materials (SIM) that is formed from the aqueous solutions of imidazolium-based dication and dianionic dye (i.e., 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid), ABTS) through ionic self-assembly. The formed SIM not only shows good thermostability and unique optical and electrochemical properties that are raised from precursors of the SIM, but also exhibits good water-stability, salt-stability, and adaptive encapsulation properties toward some heterocyclic cationic dye molecules. UV-vis and FT-IR results demonstrate that this encapsulation property is essentially based on the electrostatic interactions between the guest dye molecules and ABTS in the SIM. The application of the SIM prepared here is illustrated by the development of a new electrochemical sensor for NADH sensing at a low potential. This study not only opens a new avenue to the preparation of the supramolecular materials, but also provides a versatile platform for electrochemical (bio)sensing.
开发水稳定和自适应的超分子材料在各个研究领域都具有重要意义。在这里，我们展示了一种新型的水稳定、自适应和电活性的超分子离子材料（SIM），它是由基于咪唑的二阳离子和二阴离子染料（即 2,2'-偶氮双（3-乙基苯并噻唑啉-6-磺酸），ABTS）在水溶液中通过离子自组装形成的。所形成的 SIM 不仅表现出良好的热稳定性和独特的光学和电化学性质，这些性质是由 SIM 的前体提高的，而且还表现出对一些杂环阳离子染料分子的良好的水稳定性、盐稳定性和自适应封装性质。UV-vis 和 FT-IR 结果表明，这种封装性质本质上是基于客体染料分子与 SIM 中的 ABTS 之间的静电相互作用。这里制备的 SIM 的应用通过开发用于在低电势下检测 NADH 的新型电化学传感器来说明。这项研究不仅为超分子材料的制备开辟了新的途径，而且为电化学（生物）传感提供了一个通用的平台。
