Journal
SCIENCE
Volume 370, Issue 6515, Pages 424-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abd6406
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Funding
- NIH [S10OD024998]
- U.S. Department of Energy, Office of Science User Facilities [DEAC02-05CH11231]
- Swiss National Science Foundation [P2EZP2-184380]
- German National Academy of Science [LPDS 2019-02]
- KAVLI ENSI Philomathia Graduate Student Fellowship
- UC Berkeley-KACST Joint Center of Excellence for Nanomaterials for Clean Energy Applications, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia
- Swiss National Science Foundation (SNF) [P2EZP2_184380] Funding Source: Swiss National Science Foundation (SNF)
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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.
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