Abstract
The synthesis of four new tetraamido-type p-tert-butyl calix[4]arenes presenting two proximal binding subunits is reported. Complexation of alkali metals and zinc picrates with these ligands have been carried out and monitored by H-1-NMR in CDCl3. It is shown that hard cations are included in the tetraamido cavity while the zinc cation is chelated to the pyridine rings of one of the ligands. The formation of a 1: 1: 1 heterobinuclear complex is also described.