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Two- and three-dimensional open-framework uranium arsenates: synthesis, structure, and characterization.

V Koteswara Rao¹, K Bharathi, Ramanath Prabhu

¹Framework Solids Laboratory, Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560 012, India.

Inorganic Chemistry

|February 16, 2010

Summary

This summary is machine-generated.

Six new uranium arsenate compounds with open-framework structures were synthesized using hydrothermal reactions. These new materials exhibit diverse structural dimensionality and unique optical and magnetic properties, including blue upconversion emission.

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Area of Science:

Inorganic Chemistry
Materials Science
Crystallography

Background:

Uranium arsenates are compounds of interest due to their diverse structures and potential applications.
Hydrothermal synthesis is a versatile method for creating novel inorganic materials.

Purpose of the Study:

To synthesize and characterize new uranium arsenate phases with open-framework structures.
To investigate the structural diversity and properties of these novel compounds.

Main Methods:

Hydrothermal reactions utilizing uranium salts and arsenic pentoxide in the presence of ethylenediamine (en) and diethylenetriamine (DETA).
Single crystal X-ray diffraction for structural determination.
Characterization of dehydrated phases and observation of mineralogical structures.

Main Results:

Six new uranium arsenate phases with open-framework structures were successfully synthesized.
Structures range from two-dimensional to three-dimensional, with varying uranium coordination numbers.
Reversible dehydration was observed in one compound.
Mineralogical structures and a secondary building unit (SBU-4) were identified.
One uranium arsenate exhibited blue upconversion emission and antiferromagnetic behavior.

Conclusions:

Hydrothermal synthesis is effective for creating complex uranium arsenates.
The observed structures and properties highlight the potential for designing novel functional materials.
The identified SBU-4 is a significant building block in uranium arsenate frameworks.