Molecular cages with arylboronate ester caps at the vertices are described. The were obtained by metal-templated polycondensation reactions of a tris(2-formylpyridine oxime) ligand arylboronic acids. Suited templates triflate or triflimide salts ZnII, FeII, CoII, MnII. In products, metal ions coordinated internally to pyridyl and oximato N atoms adjacent boronate ester, resulting in an improved...