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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Porous coordination polymers (PCPs) offer tunable framework scaffolds, pore sizes, and functionalities.
  • Structuring PCPs into larger morphologies is crucial for practical applications but challenging for solid-solution or multivariate metal-organic frameworks (MOFs).
  • Existing structuring methods are limited and have not been applied to homogeneously mixed multi-component MOFs.

Purpose of the Study:

  • To demonstrate the structuring of a solid-solution PCP into a mesoscopic box superstructure.
  • To develop a novel fabrication method for multi-component MOFs using bidirectional diffusion.
  • To investigate the impact of the structured superstructures on mass transfer kinetics.

Main Methods:

  • Utilized a box-type superstructure comprising a solid-solution PCP.
  • Integrated bidirectional diffusion of multiple organic ligands (H2bdc and ndc) into molecular assembly.
  • Placed parent [Zn2(ndc)2(bpy)]n crystals in DMF solution with H2bdc and heated to 80 °C, inducing component diffusion and recrystallization.

Main Results:

  • Achieved spatial localization of recrystallization at the surface of parent crystals via bidirectional diffusion.
  • Successfully organized nanocrystals of a solid-solution PCP ([Zn2(bdc)1.5(ndc)0.5(bpy)]n) into a mesoscopic box superstructure.
  • Demonstrated that the resulting box superstructures significantly enhanced mass transfer kinetics for hydrocarbon separation.

Conclusions:

  • Established a new method for fabricating structured solid-solution PCPs/MOFs.
  • The bidirectional diffusion approach enables the creation of complex mesoscopic architectures from molecular components.
  • The enhanced mass transfer in structured PCPs shows promise for efficient separation processes.