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Updated: Sep 27, 2025
11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Isotope-selective pore opening in a flexible metal-organic framework
Linda Bondorf1, Jhonatan Luiz Fiorio2, Volodymyr Bon2
1Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany.
Science Advances
|April 13, 2022
Summary
Flexible metal-organic frameworks (MOFs) can separate gases. DUT-8(Ni) MOFs selectively open for deuterium (D2) but not hydrogen (H2), enabling efficient isotope separation.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Flexible metal-organic frameworks (MOFs) exhibit guest-induced phase transitions.
- These transitions are key for selective and energy-efficient gas separations.
Purpose of the Study:
- Investigate the gate-opening mechanism of DUT-8(Ni) MOF.
- Determine its selectivity for different hydrogen isotopes.
Main Methods:
- In situ neutron diffraction to observe pressure-induced phase transitions.
- Low-temperature thermal desorption spectroscopy for selectivity measurements.
- First-principles calculations and statistical thermodynamics for theoretical prediction.
Main Results:
- DUT-8(Ni) shows selective gate-opening in response to deuterium (D2) pressure.
- An outstanding D2-over-H2 selectivity of 11.6 was achieved at 23.3 K.
- Nuclear quantum effects were identified as crucial for isotope selectivity.
Conclusions:
- Gate-opening in DUT-8(Ni) is a highly effective strategy for separating hydrogen isotopologs.
- The material demonstrates potential for separating D2 from H2 and other isotopologs like HT, DT, and T2.
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