Conversion of Molecules and Clusters to Extended 3-D Cage and Channel Networks
Inorganic solids with inner cavities such as zeolites have found widespread use as industrial sorbents, ion-exchangers and shape-selective catalysts due to their ability to reversibly bind small molecules and ions.1 In an effort to explore the possibility of producing zeolite-like materials that are not based on oxides, we and others have prepared coordination solids composed of organic ligands linked to metal ions to give extended structures. Bifunctional rod-like ligands such as, cyanides2 and 4,4′-bipyridyl3 have been utilized as anchors in linking transition metal ions to support the formation of structures with cavities where organic molecules or charge balance ions are accommodated. This synthetic strategy is schematically shown in Figure 1 for the formation of a diamond lattice from a rod like ligand and a metal ion capable of tetrahedral coordination. In principle, an extensive number of other frameworks with diverse topologies may be assembled by choosing the appropriate units of building blocks and guest species.
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