Calixarenes as Plyhapto-aromatic Ligands: Alkali Metal Ions and Sulfonated Calixarenes

摘要

Crystal structure determinations for the hexarubidium and octacesium derivatives of calix[6] arene hexasulfonic acid, as well as of a new solvate of the pentasodium derivative of calix[4]arene tetrasulfonic acid, and commetal complexes of sulfonated calixarenes, have provided further evidence for the importance of interactions with aromatic π-electrons for the heavier alkali metal cations. There is evidence as well that this interaction can be enhanced by extended ionization of the sulfonated calixarene.