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Strong correlations in actinide redox reactions.

S E Horowitz¹, J B Marston

¹Department of Physics, Brown University, Providence, Rhode Island 02912-1843, USA. witz@brown.edu

The Journal of Chemical Physics

|February 17, 2011

Summary

This study models actinide redox reactions using advanced computational methods, improving predictions for uranium, neptunium, plutonium, and americium complex behavior and disproportionation.

Area of Science:

Computational chemistry
Nuclear chemistry
Materials science

Background:

Early actinides (U, Np, Pu) and Americium (Am) exhibit complex redox behavior.
Accurate modeling of 5f electron correlations is crucial for understanding actinide chemistry.

Purpose of the Study:

To model reduction-oxidation (redox) reactions for early actinides and americium.
To improve predictions of redox potentials and disproportionation tendencies.

Main Methods:

Combining density functional theory (DFT) with a generalized Anderson impurity model.
Accounting for strong 5f electron correlations.
Diagonalization of the Anderson impurity model.

Main Results:

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Achieved improved estimates for redox potentials of actinide complexes.

Enhanced prediction of the propensity for actinide complexes to disproportionate.

Accurate modeling of An(VI)/An(V), An(V)/An(IV), An(IV)/An(III), and Am redox couples.

Conclusions:

The combined DFT and Anderson impurity model provides a robust framework for actinide redox chemistry.
This approach offers valuable insights into the stability and reactivity of actinide species.
Results aid in predicting the behavior of actinides in various chemical environments.