Calix n]arenes represent an interesting class of preorganized aromatic hosts exhibiting an enhanced ability for cation- interaction. In many biological systems, metal cation- interactions play an important role in molecular recognition. Interest has focused on the interaction between organic cations in both natural and synthetic receptors. Systematic studies of a series of related structures of artificial receptor molecules have revealed the role played by cation- interactions. Calixarenes and related skeletons are a widely used platform in order to study cation- interactions. This book...