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

Rashidi, F., Georgia Institute of Technology
Blad, C., Georgia Institute of Technology
Jones, C. W., Georgia Institute of Technology
Nair, S., Georgia Institute of Technology

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.