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首页> 外文期刊>Advanced Functional Materials >Proximity Effect in Crystalline Framework Materials: Stacking-Induced Functionality in MOFs and COFs
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Proximity Effect in Crystalline Framework Materials: Stacking-Induced Functionality in MOFs and COFs

机译：晶体框架材料中的邻近效应：MOF和COF中的堆叠诱导的功能

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Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) consist of molecular building blocks being stitched together by strong bonds. They are well known for their porosity, large surface area, and related properties. The electronic properties of most MOFs and COFs are the superposition of those of their constituting building blocks. If crystalline, however, solid-state phenomena can be observed, such as electrical conductivity, substantial dispersion of electronic bands, broadened absorption bands, formation of excimer states, mobile charge carriers, and indirect band gaps. These effects emerge often by the proximity effect caused by van der Waals interactions between stacked aromatic building blocks. Herein, it is shown how functionality is imposed by this proximity effect, that is, by stacking aromatic molecules in such a way that extraordinary properties emerge in MOFs and COFs. After discussing the proximity effect in graphene-related materials, its importance for layered COFs and MOFs is shown. For MOFs with well-defined structure, the stacks of aromatic building blocks can be controlled via varying MOF topology, lattice constant, and by attaching steric control units. Finally, an overview of theoretical methods to predict and analyze these effects is given, before the layer-by-layer growth technique for well-ordered surface-mounted MOFs is summarized.
机译：金属 - 有机框架（MOF）和共价有机框架（COF）包括通过强键缝合在一起的分子构建块。它们众所周知，孔隙率，大表面积和相关性能。大多数MOF和COF的电子性质是它们构成构建块的电子性能。然而，如果结晶，可以观察到固态现象，例如导电性，电子带的大量分散，扩大吸收带，促进型态，移动电荷载体和间接带间隙。这些效果通常通过Van der Waals在堆叠的芳族构建块之间的相互作用引起的邻近效应来出现。在此，示出了如何通过堆叠芳族分子来施加功能的功能如何，即非凡的性质在MOF和COF中出现。在讨论与石墨烯相关材料中的邻近效应之后，显示了其对层状COF和MOF的重要性。对于具有明确定义结构的MOF，可以通过改变MOF拓扑，晶格常数和附着空间控制单元来控制芳族构建块的堆叠。最后，在逐层制作用于井的表面安装的MOF的层的逐层生长技术之前，给出了预测和分析这些效果的理论方法的概述。

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