Research on self-assembly of dimeric tetraurea calix[4]pyrrole capsules from the group of Pablo Ballester reaches the cover in PNAS
The article Self-assembly of dimeric tetraurea calix[4]pyrrole capsules (P. Natl. Acad. Sci. USA 2009, 106, 10455-10459), authored by Pablo Ballester and Guzmán Gil-Ramírez, has been highlighted on the Cover of Proceedings of the National Academy of Sciences of the United States of America on issue 26, a Molecular Recognition and Self-Assembly special feature edited by Julius Rebek, Jr.
Calix[4]pyrroles having extended aromatic cavities have been functionalized with 4 ureas in the para position of their meso phenyl substituents. This tetraurea calix[4]pyrrole dimerizes reversibly in dichloromethane solution and in the presence of 4,4′-bipyridine N-N′-dioxide, forming a cyclic array of 16 hydrogen bonds and encapsulating 1 molecule of bis-N-oxide.
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30-10-2024 
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