Boroxine cages

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Science  19 Jun 2015:
Vol. 348, Issue 6241, pp. 1328
DOI: 10.1126/science.348.6241.1328-e

Boronic acids, in which a boron atom bears two hydroxyl (OH) groups and an organic group, can trimerize by dehydration to form six-membered boroxine rings, and molecules bearing more than one boronoic acid group can form polymer networks. Ono et al. extend the architectures that can be formed to cages. They designed pincer-like organic groups that set B(OH)2 groups at desired angles. After heating and dehydration, the molecule with an 84° angle between hydroxyl groups formed an octahedron from six units, with a 1.5-nanometer cavity, and the molecule with a 117° angle formed a cuboctahedron from 12 units with a 2.5-nanometer cavity.

J. Am. Chem. Soc. 10.1021/jacs.5b02716 (2015).

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