Tetrahedral Anion Cage: Self‐Assembly of a (PO4)4L4 Complex from a Tris(bisurea) Ligand

Theseanalogies provide promising ideas for the self-assembly ofnovel supramolecular systems based on anion coordination.In the past few decades, zero-dimensional, aestheticallypleasing metal coordination complexes, such as molecularsquares, capsules, tetrahedra, and other complex polyhedralshapes, have attracted much interest.