Department of Chemistry, University of California, Berkeley, CA 94720, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; Kavli Energy NanoSciences Institute, Berkeley, CA 94720, USA; Berkeley Global Science Institute, Berkeley, CA 94720, USA; and King Abdulaziz City for Science and Technology, Riyadh 11442, Saudi Arabia.
Science. 2017 Mar 3;355(6328). doi: 10.1126/science.aal1585.
Just over a century ago, Lewis published his seminal work on what became known as the covalent bond, which has since occupied a central role in the theory of making organic molecules. With the advent of covalent organic frameworks (COFs), the chemistry of the covalent bond was extended to two- and three-dimensional frameworks. Here, organic molecules are linked by covalent bonds to yield crystalline, porous COFs from light elements (boron, carbon, nitrogen, oxygen, and silicon) that are characterized by high architectural and chemical robustness. This discovery paved the way for carrying out chemistry on frameworks without losing their porosity or crystallinity, and in turn achieving designed properties in materials. The recent union of the covalent and the mechanical bond in the COF provides the opportunity for making woven structures that incorporate flexibility and dynamics into frameworks.
一个多世纪以前，Lewis 发表了他关于共价键的开创性工作，此后，共价键在有机分子的理论中占据了核心地位。随着共价有机骨架（COF）的出现，共价键的化学扩展到了二维和三维骨架。在这里，通过共价键将有机分子连接起来，生成由轻元素（硼、碳、氮、氧和硅）组成的结晶多孔 COF，其特点是具有高结构和化学稳定性。这一发现为在不损失其多孔性或结晶度的情况下在骨架上进行化学研究铺平了道路，并为材料的设计特性提供了可能。最近，COF 中共价键和机械键的结合为制造编织结构提供了机会，将柔韧性和动态性融入到骨架中。
