Fig. 6. (Top) Representation of the ftw-MOF-2 framework: green ellipsoids represent the larger asymmetrical cage; yellow spheres represent the smaller symmetrical cages. Purple polyhedra represent the rare earth hexanuclear MBB; blue polygons represent the 4-connected quadrangular organic MBB. (Bottom left and center) Diagram of the asymmetrical cage along two axes; (bottom right) diagram of the symmetrical cage.
