Towards imaging electron density inside metal-organic framework structures.

Area of Science:

• Materials Science
• Crystallography
• Chemistry

Background:

• Metal-organic frameworks (MOFs) are advanced porous materials with diverse applications.
• Characterizing MOF structures and guest interactions is crucial for optimizing their performance.
• Traditional methods for detailed structural analysis can be resource-intensive.

Purpose of the Study:

• To demonstrate the utility of electron density maps derived from laboratory X-ray diffraction data for MOF analysis.
• To investigate structural variations within MOFs resulting from different guests or post-synthetic modifications.
• To assess the feasibility of using accessible X-ray data for exploring MOF frameworks.

Main Methods:

• Single crystal X-ray diffraction data collection using laboratory diffractometers.
• Generation and analysis of electron density maps from collected X-ray data.
• Comparison of electron density maps for MOFs with varying pore contents or modifications.

Main Results:

• Electron density maps were successfully generated for three distinct MOFs.
• Analysis revealed discernible differences in electron density distribution within the MOF pores.
• These differences correlated with the presence of different guests or post-synthetic modifications.

Conclusions:

• Electron density mapping using laboratory X-ray data is a viable approach for MOF characterization.
• This technique can provide insights into the internal pore environment and structural changes.
• It offers a cost-effective alternative for exploring MOF frameworks.