Related Experiment Videos
Tetrakis(imidazolyl)borate-based coordination polymers: group II network solids, M[B(Im)4]2(H2O)2 (M = Mg, Ca, Sr)
Barton H Hamilton1, Kathryn A Kelly, Wilhelm Malasi
1Department of Chemistry, University of Akron, Akron, OH 44325-3601, USA.
Inorganic Chemistry
|April 29, 2003
Summary
New metal-organic frameworks using tetrakis(imidazolyl)borate were synthesized. The magnesium, calcium, and strontium compounds exhibit distinct network structures and hydrogen bonding, influencing their dimensionality.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Crystallography
Background:
- Metal-organic frameworks (MOFs) are versatile materials with tunable properties.
- The tetrakis(imidazolyl)borate anion offers unique coordination possibilities for MOF construction.
Purpose of the Study:
- To synthesize and characterize new alkaline earth metal-organic framework solids.
- To investigate the structural diversity and hydrogen bonding in these MOFs.
- To understand the role of the tetrakis(imidazolyl)borate anion's conformation.
Main Methods:
- Synthesis of alkaline earth metal-organic frameworks.
- Single-crystal X-ray diffraction for structural determination.
- Analysis of hydrogen bonding interactions.
Main Results:
- Three compounds with the formula M[B(Im)4]2(H2O)2 (M = Mg, Ca, Sr) were successfully synthesized.
- All compounds share the same metal coordination environment but exhibit different network structures.
- Magnesium forms a 2D network, while calcium and strontium form 1D chains, with varying hydrogen bonding.
- The structure of the protonated anion, B(HIm)(Im)3, was determined.
Conclusions:
- The conformation of the tetrakis(imidazolyl)borate anion significantly influences the resulting network topology.
- Alkaline earth metals can form diverse MOF structures with this coordinating anion.
- Understanding these structure-property relationships is crucial for designing new functional materials.