Molecular imine cages with π-basic Au₃(pyrazolate) faces

One tetrahedral and two trigonal prismatic cages with π-basic Au₃(pyrazolate)₃ faces were obtained by connection of pre-formed gold complexes via dynamic covalent imine chemistry. The parallel arrangement of the Au₃(pyrazolate)₃ complexes in the prismatic cages augments the interaction with π-acids, as demonstrated by the encapsulation of polyhalogenated aromatic compounds. The tetrahedral cage was found to act as a potent receptor for fullerenes. The structures of the three cages, as well as the structures of adducts with C₆₀ and C₇₀, could be established by X-ray crystallography.