Defect engineering is a viable strategy for controlling the physical and chemical properties of various materials, including metal-organic frameworks (MOFs). In the present contribution, we describe a strategy for introducing and controlling defects into Zn2(dobdc) (H4dobdc = 2,5-Dihydroxyterephthalic acid), Zn-MOF-74. The defected MOF was characterized by various methods, including laboratory and synchrotron X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), confocal fluorescence microscopy (CFM), gas sorption analyses, thermogravimetric analyses (TGA), energy-dispersive X-ray spectroscopy (EDX) and others. The SEM showed physical appearance of the crystals remained unchanged, while the PXRD was consistent with an amorphous solid in the most defected samples. In addition, EDX spectra showed more defected materials had lower amounts of the linker. The defect engineering was shown to be effective in introducing new properties. For example, while the non-defected MOF is not luminescent, the defected material shows bright green emission upon excitation with UV light.

Defect engineering of MOF-74

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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