美国加州大学伯克利分校Omar M. Yaghi研究组实现更高价态共价有机框架（COF）的设计。这一研究成果发表在2020年10月23日出版的国际学术期刊《科学》上。

Title: Design of higher valency in covalent organic frameworks

Author: Cornelius Gropp, Tianqiong Ma, Nikita Hanikel, Omar M. Yaghi

Issue&Volume: 2020/10/23

Abstract: The valency (connectivity) of building units in covalent organic frameworks (COFs) has been primarily 3 and 4, corresponding to triangles and squares or tetrahedrons, respectively. We report a strategy for making COFs with valency 8 (cubes) and “infinity” (rods). The linker 1,4-boronophenylphosphonic acid—designed to have boron and phosphorus as an isoelectronic combination of carbon-group elements—was condensed into a porous, polycubane structure (BP-COF-1) formulated as (–B4P4O12–)(–C6H4–)4. It was characterized by x-ray powder diffraction techniques, which revealed cubes linked with phenyls. The isoreticular forms (BP-COF-2 to 5) were similarly prepared and characterized. Large single crystals of a constitutionally isomeric COF (BP-COF-6), composed of rod units, were also synthesized using the same strategy, thus propelling COF chemistry into a new valency regime.

DOI: 10.1126/science.abd6406

Source: https://science.sciencemag.org/content/370/6515/eabd6406