Abstract
In an extension of chemical domesticity, researchers have shown that organic chemistry is good not only for cooking but for weaving as well. Several types of supramolecular structures—catenanes, rotaxanes, molecular knots, and molecular Borromean rings—have interwoven two- and three-dimensional parts. Now, Osamu Terasaki of Stockholm University; Omar M. Yaghi of the University of California, Berkeley; and coworkers have designed and constructed the first structures in which 1-D molecular “threads” are interwoven, forming a crystalline covalent organic framework (Science 2016, DOI: 10.1126/science.aad4011). The researchers first synthesized a copper(I) bisphenanthroline complex in which the two organic groups adopt an interlaced inverted-U orientation. They then added benzidines to the ends of the organic groups and linked the benzidines by forming imine bonds, creating a woven material they call COF-505. The copper ions can be removed and reinserted reversibly. The demetalation increases the material’s el...
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