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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Updated: Jun 4, 2026

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

Published on: November 9, 2015

Surprising coordination for plutonium in the first plutonium(III) borate.

Shuao Wang¹, Evgeny V Alekseev, Wulf Depmeier

¹Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Inorganic Chemistry

|February 24, 2011

Summary

Researchers synthesized the first plutonium(III) borate compound, featuring a unique 3D polyborate network. This novel material showcases plutonium sites with unusual coordination numbers and geometries.

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Area of Science:

Inorganic Chemistry
Materials Science
Radiochemistry

Background:

Plutonium borates are a class of inorganic compounds with potential applications in various fields.
Understanding the structural and coordination chemistry of plutonium is crucial for its safe handling and utilization.

Purpose of the Study:

To synthesize and characterize the first plutonium(III) borate compound.
To investigate the structural features and coordination environment of plutonium within the borate framework.

Main Methods:

Synthesis of plutonium(III) borate by reacting plutonium(III) with molten boric acid.
Strictly anaerobic conditions were maintained throughout the preparation process.
Structural characterization using X-ray diffraction and other analytical techniques.

Main Results:

The first plutonium(III) borate, Pu(2)[B(12)O(18)(OH)(4)Br(2)(H(2)O)(3)]·0.5H(2)O, was successfully prepared.
The compound exhibits a three-dimensional polyborate network with triangular voids.
Plutonium(III) sites are located within these voids, displaying atypical 9- and 10-coordinate geometries.

Conclusions:

This study reports the novel synthesis and structural characterization of a plutonium(III) borate.
The unique polyborate framework and unusual plutonium coordination highlight the diverse chemistry of actinide borates.
Further research may explore the properties and potential applications of this new class of materials.