Non-covalent interactions exert extraordinary influence over conformation and properties of a well-known supramolecular building block.
At low pH, and in the presence of 4,4'-bipyridine, p-sulfonatocalix[4]arene crystallizes in the 1,3-alternate conformation rather than the expected cone conformation and exhibits remarkable stability.
Barbour
L J
LJ
Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
Atwood
J L
JL