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Single-Electron Transfer Stabilizes Metastable Alane in a Bipyridine-Functionalized MOF Nanopore.

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Area of Science:

  • Materials Science
  • Chemistry
  • Energy Storage

Background:

  • Metastable hydrides like alane (AlH3) offer high-capacity energy storage potential.
  • Understanding the stabilization mechanisms of these hydrides in porous frameworks is crucial but poorly understood.

Purpose of the Study:

  • To investigate the thermodynamic stabilization of alane (AlH3) within a functionalized metal-organic framework (MOF).
  • To elucidate the underlying mechanisms of hydride-host interactions at a molecular level.

Main Methods:

  • Application of solution Lewis acid-base chemistry concepts to a crystalline MOF.
  • Synthesis and characterization of AlH3-infiltrated UiO-67bpy using Powder X-ray Diffraction (PXRD).
  • Analysis of hydride-host interactions using Electron Paramagnetic Resonance (EPR) and Bader charge analysis.

Main Results:

  • UiO-67bpy framework remains crystalline up to 250 °C and stable under 70 MPa H2 pressure.
  • Thermodynamic stabilization of AlH3 is achieved through coupled single-electron and hydrogen-atom transfer to bipyridine linkers.
  • EPR detected a bipyridyl radical, supported by charge analysis predicting 0.82 e- transfer from AlH3 to the MOF.

Conclusions:

  • Established critical structure-property relationships for AlH3 stabilization in MOFs.
  • Demonstrated a general strategy for tuning the thermodynamics and kinetics of metastable materials for energy storage applications.