Design of higher valency in covalent organic frameworks.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33093081.
- Also identified by DOI 10.1126/science.abd6406.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
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-<b>1</b>) formulated as (-B<sub>4</sub>P<sub>4</sub>O<sub>12</sub>-)(-C<sub>6</sub>H<sub>4</sub>-)<sub>4</sub> It was characterized by x-ray powder diffraction techniques, which revealed cubes linked with phenyls. The isoreticular forms (BP-COF-<b>2</b> to <b>5</b>) were similarly prepared and characterized. Large single crystals of a constitutionally isomeric COF (BP-COF-<b>6</b>), composed of rod units, were also synthesized using the same strategy, thus propelling COF chemistry into a new valency regime.