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Molecular flexibility in metal-organic frameworks (MOFs) like NU-1000 significantly impacts water adsorption. Accounting for aquo ligand rotation is crucial for accurate simulation of MOF water interactions.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are porous materials with tunable properties.
  • Understanding water adsorption in MOFs is critical for applications like gas storage and separation.
  • Previous computational studies often overlook the flexibility of MOF components.

Purpose of the Study:

  • To investigate the water adsorption mechanism in the metal-organic framework NU-1000.
  • To assess the impact of aquo ligand orientation and flexibility on water adsorption isotherms.
  • To develop a simulation approach that accurately captures MOF water interactions.

Main Methods:

  • Utilized molecular simulations to study water adsorption in NU-1000.
  • Analyzed the influence of terminal aquo ligand orientation and rotational mobility.
  • Examined adsorption modes and interaction sites, focusing on the Zr6O8 node.

Main Results:

  • Small changes in aquo ligand orientation significantly alter the water adsorption isotherm's condensation step.
  • Aquo ligand rotational mobility can shift the condensation step by up to 20% relative humidity.
  • Configurational changes in the Zr6O8 node can switch interactions from hydrophobic to hydrophilic.

Conclusions:

  • Local molecular flexibility, particularly aquo ligand rotation, is essential for accurate MOF water adsorption simulations.
  • Neglecting such flexibility can lead to mischaracterization of MOFs' water adsorption properties.
  • The proposed simulation approach shows good agreement with experimental results.