connects to two adjacent basket cages via supramolecular interactions to form a 1D supramolecular chain along the [001] direction. The 2D layer and 1D chains intersect with each other to form a 3D network with basket cages as junctions. Compound2 is a dimeric string connected by Na(H2O)2} and Fe(H2O)4} units, and is the first basket dimer chain linked by a mixed metal linker. The protonated ligand bbtb