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. 2018 Oct 31;51(12):3052–3064. doi: 10.1021/acs.accounts.8b00415

Figure 2.

Figure 2

(a) UMCM-1, a mixed-ligand MOF prepared from tritopic BTB and ditopic BDC ligands. (b) UiO-67, consisting of only one type of ligand. (c) In the related PCN-700, bulky methyl substituents at the 2- and 2′-position lead to perpendicular positioning of the two phenyl rings. As a result, only eight ligands coordinate to each Zr6O6(OH)4 cluster, leaving two open coordination sites in the crystal structure. These open pockets are available for shorter BDC and longer TPDC ligands. Adapted from ref (17). Copyright 2015 American Chemical Society.