Supramolecular Metallacycles and Their Binding of Fullerenes

The synthesis of a new triaminoguanidinium‐based ligand with three tris‐chelating [NNO]‐binding pockets and C (3) symmetry is described. The reaction of tris‐(2‐pyridinylene‐N‐oxide)triaminoguanidinium salts with zinc(II) formate leads to the formation of cyclic supramolecular coordination compounds which in solution bind fullerenes in their spherical cavities. The rapid encapsulation of C(60) can be observed by NMR spectroscopy and single‐crystal X‐ray diffraction and is verified using computation.