Linker depletion for missing cluster defects in non-UiO metal-organic frameworks

Area of Science:

• Materials Science
• Chemistry

Background:

• Defect engineering is crucial for tuning metal-organic framework (MOF) properties.
• Current defect chemistry research in MOFs is largely confined to UiO-type frameworks.

Purpose of the Study:

• To investigate the preferential formation of missing cluster defects in heterometallic titanium-organic frameworks (MUV-10 family).
• To rationalize the impact of these defects on porosity and structure using integrated experimental and computational approaches.

Main Methods:

• Synthesis of MUV-10 titanium-organic frameworks under sub-stoichiometric linker conditions.
• Experimental characterization including synchrotron X-ray diffraction.
• Computational modeling to correlate experimental findings and analyze defect structures.

Main Results:

• Preferential formation of missing cluster defects observed in MUV-10 under specific synthesis conditions.
• Computational models confirmed the dominance of missing cluster vacancies in pore size distribution.
• Synchrotron X-ray diffraction showed diffuse scattering, indicating short-range order and challenges in direct structural indexing of defects.

Conclusions:

• Defect engineering in the MUV-10 family is achievable through controlled synthesis.
• Integrated experimental and computational methods are vital for understanding defect impacts on MOF properties.
• High-resolution electron microscopy is necessary for detailed nanoscale disorder modeling in titanium MOFs due to limitations of X-ray diffraction.