Unique Topology Analysis by ToposPro for a Metal-Organic Framework with Multiple Coordination Centers

Area of Science:

• Materials Chemistry
• Crystallography
• Supramolecular Chemistry

Background:

• Metal-organic frameworks (MOFs) are porous materials with diverse applications.
• Topological analysis is crucial for understanding MOF structures and properties.
• Developing novel MOFs with enhanced adsorption capabilities is an active research area.

Purpose of the Study:

• To synthesize and characterize a novel 3D mixed-valence, four-copper-center metal-organic framework.
• To investigate a new approach for topological analysis of MOFs using connection atoms as central atoms.
• To evaluate the gas adsorption properties of the synthesized MOF, specifically its selectivity for CO2 over N2.

Main Methods:

• Reaction of 2-(4-pyridyl)thiazole-4-carboxylic acid (Hptca) with CuCl2·6H2O to form the MOF.
• X-ray diffraction and crystallographic analysis to determine the MOF structure.
• Topology analysis using the ToposPro software package.
• Gas adsorption experiments (CO2 and N2) to assess selectivity.

Main Results:

• A novel 3D mixed-valence, four-copper-center MOF, [Cu8Cl2(ptca)10·17H2O]n (1), was successfully synthesized.
• Topological analysis revealed three chain-based topology types (sra, pcu, dia) using connection atoms as central atoms, a novel approach.
• The MOF exhibited significant selective adsorption of carbon dioxide (CO2) over nitrogen (N2).

Conclusions:

• The study presents a new MOF with a unique structure and topology.
• A novel and effective method for topological analysis of MOFs with multiple coordination centers was demonstrated.
• The synthesized MOF shows potential for applications in gas separation, particularly for CO2 capture.