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(a) Perspective view of the [ZII(bpy)3]2+ (ZII = Zn2+, Cu2+, Ru2+, Os2+) complex hosted in the anionic three-fold cage. (b) Simplified topological representation of the anionic cage (black nodes are RuIII and MI metal centers; grey rods are the oxalate ligand) with the srs triangular tile. (c) Tile packing, which reconstructs the cage structure in the 3D honeycomb-like framework.
