Zhao Peng, Xia Jiahao, Cao Muqing, Xu Huaping
Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
ACS Macro Lett. 2020 Feb 18;9(2):163-168. doi: 10.1021/acsmacrolett.9b00983. Epub 2020 Jan 15.
Wavelength-controlled Se-S dynamic chemistry was put forward recently as a convenient way to regulate the balance of a selenide sulfide exchange reaction. In this paper, we synthesized an asymmetric polymeric amphiphile linked with a Se-S bond and then induced it to self-assemble into vesicles in water. When the visible light was applied to the assembly solution with addition of toluene, Se-S bonds containing vesicles were ruptured. Thus, the wavelength-controlled light responses of relatively stable polymer assembly were accomplished by introduction of the Se-S dynamic covalent bond, and the response mechanism of the Se-S bond in the vesicle was explored by nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), and X-ray photoelectron spectroscopy (XPS). The results indicated that fracture of the Se-S bond led to the dissociation of assembly. Introduction of Se-S dynamic chemistry into the molecular assembly area enriched the light-responsive polymer systems and would bring many potential applications in the future.
波长控制的硒-硫动态化学是最近提出的一种调节硒化物硫化物交换反应平衡的简便方法。在本文中，我们合成了一种通过硒-硫键连接的不对称聚合物两亲物，然后诱导其在水中自组装成囊泡。当在添加甲苯的组装溶液中施加可见光时，含硒-硫键的囊泡破裂。因此，通过引入硒-硫动态共价键实现了相对稳定的聚合物组装体的波长控制光响应，并通过核磁共振（NMR）、凝胶渗透色谱（GPC）和X射线光电子能谱（XPS）探索了囊泡中硒-硫键的响应机制。结果表明，硒-硫键的断裂导致组装体的解离。将硒-硫动态化学引入分子组装领域丰富了光响应聚合物体系，并将在未来带来许多潜在应用。
