A robust nanoporous supramolecular metal-organic framework based on ionic hydrogen bonds

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Crystal Engineering

Background:

• Development of robust porous materials is crucial for applications in separation and storage.
• Supramolecular self-assembly offers a versatile route to construct complex framework architectures.

Purpose of the Study:

• To synthesize and characterize a novel 3D porous supramolecular framework.
• To investigate the structural stability and guest sorption properties of the framework.

Main Methods:

• Hydrogen-bond-directed self-assembly of organic cations ([H3-MeTrip](3+)) and anionic complexes ([Zr2(oxalate)7](6-)).
• Single-crystal X-ray diffraction to analyze crystal structure and porosity.
• Sorption studies to evaluate guest uptake capabilities.

Main Results:

• A structurally, thermally, and chemically robust 3D supramolecular framework with 1 nm wide channels was successfully synthesized.
• The framework demonstrated permanent porosity, maintaining its crystal structure through sorption-desorption cycles.
• The porous channels showed selective affinity for polar organic molecules (alcohols, aniline) and halogenated compounds, including iodine.

Conclusions:

• The synthesized supramolecular framework exhibits exceptional stability and permanent porosity.
• The material shows potential for selective adsorption and separation of various guest molecules.
• This work highlights the power of hydrogen-bond assembly in creating advanced porous materials.