Fig. 1: Schematic representation for the construction strategy and the self-assembly.

a Schematic representation for the construction strategy and the self-assembly of Zn₂Er₄L¹₄ supramolecular cage. b Schematic representation for the construction strategy and the self-assembly of Zn₄Er₆L²₆ and Zn₂Er₈L³₈ supramolecular cages.