Novel (3,4,6)-connected metal-organic framework with high stability and gas-uptake capability

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are crystalline porous materials with diverse applications.
• Developing stable MOFs with high gas adsorption capacities is crucial for energy and environmental solutions.

Purpose of the Study:

• To synthesize and characterize a novel microporous, noninterpenetrated MOF.
• To investigate the gas adsorption properties and selectivity of the synthesized MOF.

Main Methods:

• Synthesis of the MOF using [1,1':3',1″-terphenyl]-4,4″,5'-tricarboxylic acid (H(3)L) and 1,4-diazabicyclo[2.2.2]octane (DABCO).
• Variable-temperature powder X-ray diffraction (VT-PXRD) for structural analysis and stability assessment.
• Gas adsorption measurements at various temperatures and pressures.

Main Results:

• The synthesized MOF, [Cu(3)(L)(2)(DABCO)(H(2)O)]·15H(2)O·9DMF (1), demonstrated high stability.
• Exceptional adsorption capacities were observed for H(2) (54.3 mg g(-1)), CO(2) (871 mg g(-1)), CH(4) (116.7 mg g(-1)), and n-pentane (686 mg g(-1)).
• The MOF exhibited excellent CO(2) selectivity over N(2) at ambient temperatures.

Conclusions:

• The N,N'-ditopic DABCO ligand plays a key role in stabilizing the Cu-L framework.
• The MOF's high stability and selective CO(2) adsorption capacity indicate its potential for practical gas separation and purification applications.