C RYPTATES XIX. Ligands polyaza‐polyoxa‐macrobicycliques: Synthèse et complexes métalliques

Polyaza‐polyoxa macrobicyclic ligands: its synthesis and metal complexes. The synthesis of the polyaza‐polyoxa macrobicyclic ligands 1–4 is described. They form complexes with a variety of metal cations, transition metal cations as well as alkali and alkaline‐earth cations. These complexes may be formulated as cation inclusion complexes, cryptates, in which the cation is contained in the intramolecular cavity. The properties of the complexes are described. An especially interesting feature is that these ligands, polymines of macrobicyclic topology, provide a means of trapping transition metal cations inside a molecular cavity; thus they impose coordination geometries and may modify the spectral and redox properties of the cations.