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. 2022 Dec 1;27(23):8387. doi: 10.3390/molecules27238387

Figure 1.

Figure 1

Illustration of the crystalline structure of UiO-66. (a) Structure of the inorganic building unit {Zr6O4(OH)4(O2CR)12}: Zr atoms are located at the vertices of octahedra, which are included in the cubes of the μ3-O and μ3-OH ligands; every two Zr atoms are connected by carboxylate ligands (only 4 of them are shown for clarity) forming 12 connected nodes; these nodes are combined, forming tetrahedral (b) and octahedral (c) cavities; (d) packing of two types of cavities according to [26]; tetrahedral—yellow; octahedral—green.