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Solvent-Free Synthesis of ZIFs: A Route toward the Elusive Fe(II) Analogue of ZIF-8.

Javier López-CabrellesJorge RomeroGonzalo AbellánMónica Giménez-MarquésMiguel PalominoSusana ValenciaFernando ReyGuillermo Mínguez Espallargas
Published in: Journal of the American Chemical Society (2019)
Herein we report the synthesis of an elusive metal-organic framework, the iron(II) analogue of ZIF-8 with the formula Fe(2-methylimidazolate)2, here denoted as MUV-3. The preparation of this highly interesting porous material, inaccessible by common synthetic procedures, occurs in a solvent-free reaction upon addition of an easily detachable template molecule, yielding single crystals of MUV-3. This methodology can be extended to other metals and imidazolate derivatives, allowing the preparation of ZIF-8, ZIF-67, and the unprecedented iron(II) ZIFs Fe(2-ethylimidazolate)2 and Fe(2-methylbenzimidazolate)2. The different performance of MUV-3 toward NO sorption, in comparison to ZIF-8, results from the chemisorption of NO molecules, which also causes a gate-opening behavior. Finally, the controlled pyrolysis of MUV-3 results in a N-doped graphitic nanocomposite that exhibits extraordinary performance for the oxygen evolution reaction (OER), with low overpotential at different current densities (316 mV at 10 mA cm-2), low Tafel slope (37 mV per decade), high maximum current density (710 mA cm-2 at 2.0 V vs RHE), and great durability (15 h).
Keyphrases
  • metal organic framework
  • visible light
  • molecularly imprinted
  • ionic liquid
  • quantum dots
  • sewage sludge
  • heavy metals
  • human milk
  • high resolution
  • health risk
  • electron transfer
  • health risk assessment