Zeolitic imidazolate frameworks (ZIFs) are a subclass of nanoporous metal-organic frameworks (MOFs) that exhibit zeolite-like structural topologies and have interesting molecular recognition properties, such as molecular sieving, and gate-opening effects associated with their pore apertures. This works investigates the synthesis and characterization of hybrid ZIFs with mixed linkers in the framework, thereby producing properties different from the parent frameworks (ZIF-8, ZIF-90, and ZIF-7). NMR spectroscopy is used to show control over the relative amounts of the linkers included in the framework. In the case of ZIF-8-90 hybrids, the cubic structure of the parent frameworks is continuously maintained, whereas in the ZIF-7-8 hybrids there is a transition from a cubic to a rhombohedral structure. Nitrogen physisorption reveals that the hybrid materials exhibit substantial changes in gate-opening phenomena, either occurring at continuously tunable partial pressures of N2 (ZIF-8-90 hybrids) or loss of gate-opening effects to yield more rigid frameworks (ZIF-7-8 hybrids).

Hybrid zeolitic imidazolate frameworks: Controlling porosity and functionality by mixed-linker synthesis

244th National Meeting (2012)

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