Li Chun, Zhang Zejun, Heinke Lars
Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Langmuir. 2022 Nov 1;38(43):13103-13108. doi: 10.1021/acs.langmuir.2c01810. Epub 2022 Oct 7.
Smart and photoresponsive materials and thin films allow the dynamic remote control of their central properties. By incorporation of photochromic molecules in nanoporous metal-organic frameworks (MOFs), the interaction between the MOF host and the guest molecules in the pores can be modified. Here, a MOF film of type UiO-68 is presented in which the photoswitchable feature is added by embedment of photochromic fulgide molecules of type Aberchrome 670 in the pores. The photoisomerization in the pores is explored by UV-vis and infrared spectroscopy, and the transient uptake of toluene and methanol probe molecules is explored using a quartz crystal microbalance. For the first time, a fulgide-based nanoporous material is used to remote-control the adsorption and diffusion properties. We find that the toluene uptake amount can be increased by 37% and the toluene diffusion coefficient can be increased by 40% when reversibly photoswitching the embedded fulgide from its -form to -form. In this way, this study aims to contribute to the field of light-responsive nanoporous materials and thus expands the range of smart coatings.
智能且具有光响应性的材料和薄膜能够实现对其核心性能的动态远程控制。通过将光致变色分子引入纳米多孔金属有机框架（MOF）中，可以改变MOF主体与孔内客体分子之间的相互作用。在此，展示了一种UiO - 68型MOF薄膜，其中通过在孔中嵌入Aberchrome 670型光致变色俘精酸酐分子来添加光开关特性。利用紫外 - 可见光谱和红外光谱研究孔中的光异构化，并使用石英晶体微天平研究甲苯和甲醇探针分子的瞬态吸附。首次使用基于俘精酸酐的纳米多孔材料来远程控制吸附和扩散性能。我们发现，当将嵌入的俘精酸酐从其一种形式可逆地光开关转变为另一种形式时，甲苯的吸附量可增加37%，甲苯扩散系数可增加40%。通过这种方式，本研究旨在为光响应纳米多孔材料领域做出贡献，从而扩大智能涂层的范围。
