Tetrahedral tetrazolate frameworks for high CO2 and H2 uptake.
Fei Wang1, Duan-Chuan Hou, Hui Yang
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China. zhj@fjirsm.ac.cn.
Dalton Transactions (Cambridge, England : 2003)
|December 20, 2013
Summary
Researchers synthesized three tetrahedral tetrazolate frameworks with lonsdaleite (lon) and diamond (dia) topologies. The lon-type framework, showing high CO2 and H2 uptake, irreversibly transforms into the dia-type framework through solvent-exchange.
Area of Science:
- Materials Science
- Chemistry
- Crystallography
Background:
- Tetrahedral tetrazolate frameworks are an emerging class of porous materials.
- Understanding their topological diversity and transformation pathways is crucial for designing advanced functional materials.
- The synthesis and characterization of novel frameworks with specific network topologies are of significant interest.
Purpose of the Study:
- To synthesize novel tetrahedral tetrazolate frameworks with distinct 4-connected topologies.
- To investigate the gas sorption properties, particularly for CO2 and H2, of the synthesized frameworks.
- To explore the structural transformation of these frameworks under solvent-exchange conditions.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Gas sorption analysis (CO2, H2 uptake measurements).
- Powder X-ray diffraction and thermogravimetric analysis to monitor structural transformations.
Main Results:
- Three new tetrahedral tetrazolate frameworks were successfully synthesized.
- Framework 1 exhibits the lonsdaleite (lon) topology, while frameworks 2 and 3 display the diamond (dia) topology.
- The lon-type framework demonstrated high CO2 and H2 uptake capacities.
- Irreversible structural transformation from the lon-type to the dia-type framework was observed upon solvent-exchange.
Conclusions:
- The successful synthesis of lon and dia topological frameworks expands the library of porous tetrazolates.
- The lon-type framework shows potential for gas storage applications due to its high CO2 and H2 uptake.
- The observed irreversible transformation highlights the dynamic nature of these frameworks and offers a route for tuning their properties.
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