化学
透射电子显微镜
结晶度
自然键轨道
多孔性
拓扑(电路)
粉末衍射
结构精修
晶体结构
共价键
结晶学
分子
纳米技术
材料科学
有机化学
组合数学
数学
作者
Xue Wang,Mounib Bahri,Zhiwei Fu,Marc A. Little,Lunjie Liu,Hong‐Ying Niu,Nigel D. Browning,Samantha Y. Chong,Linjiang Chen,John W. Ward,Andrew I. Cooper
摘要
The synthesis of three-dimensional (3D) covalent organic frameworks (COFs) requires high-connectivity polyhedral building blocks or the controlled alignment of building blocks. Here, we use the latter strategy to assemble square-planar cobalt(II) phthalocyanine (PcCo) units into the nbo topology by using tetrahedral spiroborate (SPB) linkages that were chosen to provide the necessary 90° dihedral angles between neighboring PcCo units. This yields a porous 3D COF, SPB-COF-DBA, with a noninterpenetrated nbo topology. SPB-COF-DBA shows high crystallinity and long-range order, with 11 resolved diffraction peaks in the experimental powder X-ray diffraction (PXRD) pattern. This well-ordered crystal lattice can also be imaged by using high-resolution transmission electron microscopy (HR-TEM). SPB-COF-DBA has cubic pores and exhibits permanent porosity with a Brunauer–Emmett–Teller (BET) surface area of 1726 m2 g–1.
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