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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Directional Bonding in Decaniobate Inorganic Frameworks.

Nicolas P Martin¹, May Nyman¹

¹Department of Chemistry, Oregon State University, Gilbert Hall, Corvallis, Oregon, 97331, USA.

Angewandte Chemie (International Ed. in English)

|September 22, 2020

Summary

Researchers developed new inorganic frameworks using decaniobate clusters. Cation charge and size control framework dimensionality, with potential applications in radioactive cesium removal.

Keywords:

basicity directional bonding ion exchange polyoxometalates polyoxoniobates

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Area of Science:

Materials Science
Inorganic Chemistry
Nanotechnology

Background:

Metal-oxo clusters are key building blocks for inorganic and metal-organic frameworks (MOFs).
Polyoxometalate clusters, while water-soluble, are difficult to link into extended frameworks due to inert oxo-caps.
Decaniobate ([Nb10]) clusters present unique directional bonding and basicity for framework assembly.

Purpose of the Study:

To exploit the properties of decaniobate oxo-caps for constructing novel inorganic frameworks.
To investigate the influence of cations on the dimensionality of these frameworks.
To explore the potential of these frameworks for radioactive cesium sequestration.

Main Methods:

Synthesis and structural characterization of nine inorganic framework structures.
Systematic variation of cations (A+, AE2+, Mn2+) to study their effect on framework dimensionality.
Ion-exchange experiments to assess selectivity for alkali metal ions.

Main Results:

Demonstrated the successful assembly of 1D, 2D, and 3D inorganic frameworks from decaniobate clusters.
Established that cation charge and size are critical factors controlling framework dimensionality.
Observed exclusive selectivity for Cs+ in ion-exchange studies of the A+-Nb10 family.

Conclusions:

Decaniobate clusters can be controllably assembled into diverse inorganic frameworks.
Cation properties dictate the dimensionality, offering a route to tailored materials.
The Cs+ selectivity highlights potential applications in radioactive waste management.