Advances in Chemistry / 2014 / Article / Fig 5

Review Article

Increasing the Stability of Metal-Organic Frameworks

Figure 5

The Zr6O8 unit of PCN-521, which is similar to that of UiO-66 except that it is 8-connected instead of 12 connected, having a “cubic” symmetry that is compatible with the tetrahedral ligands used. The equatorial Zr atoms are coordinated by hydroxyl groups on the periphery of the unit [24].

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