Balancing Mechanical Stability and Ultrahigh Porosity in Crystalline Framework Materials

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are crystalline porous materials with tunable structures.
• Achieving ultrahigh porosity in MOFs often compromises their structural stability.
• Pore collapse during desolvation is a major challenge for highly porous materials.

Purpose of the Study:

• To design and synthesize a novel MOF with ultrahigh porosity and enhanced stability.
• To investigate the structural properties and pore characteristics of the new MOF.
• To establish a new benchmark for accessible pore volume in crystalline framework materials.

Main Methods:

• In silico conceptual design using Zn4O6+ nodes and ditopic/tritopic linkers.
• Computational analysis of bulk and shear modulus to predict framework stability.
• Solvothermal synthesis utilizing a cluster precursor approach.
• Characterization of pore volume using gas adsorption measurements.

Main Results:

• Successful design and synthesis of a new MOF, DUT-60, with an ith-d topology.
• DUT-60 exhibits exceptional mechanical stability with a bulk modulus of 4.97 GPa and shear modulus of 0.50 GPa.
• The synthesized DUT-60 achieved a record-breaking accessible pore volume of 5.02 cm³ g⁻¹.
• The cluster precursor approach minimized side product formation during synthesis.

Conclusions:

• DUT-60 represents a significant advancement in the design of ultra-porous and stable MOFs.
• The high pore volume and mechanical robustness of DUT-60 make it a promising candidate for various applications.
• This work demonstrates a viable strategy for creating highly porous crystalline materials resistant to pore collapse.