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Mechanochemical Synthesis, Characterization, and Structure Determination of New Alkaline Earth Metal-Tetrafluoroterephthalate Frameworks: Ca(pBDC‑F4)·4H2O, Sr(pBDC‑F4)·4H2O, and Ba(pBDC‑F4)

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journal contribution
posted on 07.03.2016, 00:00 by Abdal-Azim Al-Terkawi, Gudrun Scholz, Franziska Emmerling, Erhard Kemnitz
New fluorinated alkaline earth metal–organic frameworks were successfully synthesized by milling of metal hydroxides M­(OH)2 with tetrafluoroterephthalic acid H2pBDC-F4. Both calcium- and strontium-tetrafluoroterephthalates are tetrahydrated, while the barium tetrafluoroterephthalate is free of coordinating water molecules. The two isomorphic structures Ca­(pBDC-F4)­·4H2O and Sr­(pBDC-F4)­·4H2O were solved from the powder diffraction data by ab initio structure determination and subsequent Rietveld refinement. The products were thoroughly characterized by elemental analysis, thermal analysis, magic-angle spinning NMR, Fourier transform infrared spectroscopy, scanning electron microscopy imaging, and Brunauer–Emmett–Teller measurements. Our findings suggest that the mechanochemical synthesis route is a promising approach for the preparation of new fluorinated alkaline earth metal–organic frameworks.