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Noble Gases

Noble Gases

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.

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Updated: Oct 31, 2025

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

Continuous Breathing Rare-Earth MOFs Based on Hexanuclear Clusters with Gas Trapping Properties.

Giasemi K Angeli¹, Edward Loukopoulos¹, Konstantinos Kouvidis¹

¹Department of Chemistry, University of Crete, Voutes, 71003 Heraklion, Greece.

Journal of the American Chemical Society

|June 29, 2021

Summary

Researchers developed new rare-earth metal-organic frameworks (RE-MOFs) with unique breathing and gas-trapping abilities. These flexible MOFs offer tunable properties for advanced material applications.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Last Updated: Oct 31, 2025

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Area of Science:

Materials Science
Chemistry
Nanotechnology

Background:

Guest responsive porous materials are crucial for advanced applications.
Rational design of these materials requires understanding their formation and behavior.
Rare-earth metal-organic frameworks (RE-MOFs) are a promising class of such materials.

Purpose of the Study:

To report a novel series of stable RE-MOFs with continuous breathing behavior.
To investigate their unprecedented gas-trapping properties.
To understand the factors controlling their flexibility and sorption capabilities.

Main Methods:

Synthesis of RE-MOFs using an asymmetric tetratopic carboxylate ligand and RE cations.
Extensive single-crystal X-ray diffraction for structural analysis.
Gas and vapor sorption studies (N2, Ar, Kr, CO2, CH4, Xe, EtOH, CH3CN, C6H6, C6H14).
Theoretical calculations to elucidate structural and sorption mechanisms.

Main Results:

Novel stable RE-MOFs (RE-thc-MOF-1) with a (3,3,8)-c thc topology were synthesized.
These MOFs exhibit continuous breathing behavior and remarkable gas-trapping properties.
Synergistic effects of steric hindrance (solvent molecules, 2-FBA ligands) and cation-framework interactions govern swelling and sorption.

Conclusions:

Coordinated solvent molecules and 2-FBA ligands cooperatively control gas breathing and trapping.
2-FBA ligands selectively control vapor adsorption.
These findings enable the design of tunable, flexible RE-based MOFs for specific applications.