(417j) Hybrid ZIF-7-90 Zeolitic Imidazolate Frameworks: Controlling Framework Porosity By Mixed-Linker Synthesis

Hybrid zeolitic imidazolate framework (ZIFs), a subclass of metal-organic frameworks (MOFs) with zeolitic topologies, can be synthetically fine-tuned in terms of their microporosity and functionality by using a mixed-linker approach.¹ However, the reliable synthesis and characterization of mixed-linker ZIFs is a relatively new area of research.² In this work, the synthesis and characterization of hybrid ZIF-7-90 frameworks with mixed-linkers of ZIF-7 (benzimidazole, Bz-IM) and ZIF-90 (carboxaldehyde-2-imidazole, OHC-IM) is demonstrated. Different synthesis methods based on variations of the solvent system, temperature, and crystallization technique at different linker ratios with either the ZIF-7 or ZIF-90 parent framework are investigated to better understand the structural and chemical properties of this new hybrid ZIF-7-90 framework. The talk will discuss in detail the effects of the solvent system and temperature on the inclusion of the ZIF-7 and ZIF-90 linkers in the ZIF-7-90 framework. ¹H-NMR spectroscopy, X-ray diffraction, SEM, carbon dioxide physisorption, and nitrogen physisorption allow for detailed insights into the tunable crystallinity, morphology, and porosity of these materials.

(1)        Thompson, J. A.; Blad, C. R.; Brunelli, N. A.; Lydon, M. E.; Lively, R. P.; Jones, C. W.; Nair, S. Chemistry of Materials 2012, 24, 1930.       

(2)        Thompson, J. A.; Brunelli, N. A.; Lively, R. P.; Johnson, J. R.; Jones, C. W.; Nair, S. Journal of Physical Chemistry C 2013 117, 8198.