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High Spin Ground States in Matryoshka Actinide Nanoclusters: A Computational Study
Han-Shi Hu1, Nikolas Kaltsoyannis1
1School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 2, 2017
Summary
Computational studies reveal new actinide nanoclusters. These Matryoshka-type clusters, featuring unique structures and high spin states, offer novel possibilities for materials science.
Area of Science:
- Computational chemistry and materials science
- Actinide chemistry and nanocluster synthesis
Background:
- Inspired by the experimentally synthesized Na12@[ (UO2)(O2)1.5 ]20 (Na12@U20) cluster.
- Exploration of metal cation substitutions within the U20 framework.
Purpose of the Study:
- To computationally investigate the stability and properties of M12@U20 systems with various metal cations (M).
- To explore the formation of novel Matryoshka actinide nanoclusters (E@M12@U20) by incorporating group 16 dianions (E).
- To design and predict nanoclusters with exceptionally high ground state spin values.
Main Methods:
- Computational modeling and theoretical calculations.
- Systematic substitution of Na+ cations with other metal ions (K+, Rb+, Cs+, Ag+, Mg2+, Fe2+, Mn2+).
- Investigation of U20 framework substitutions with Np20 and Pu20.
Main Results:
- Identified six stable M12@U20 systems beyond the Na+ variant.
- Discovered three-shell, onion-like Matryoshka nanoclusters (E@M12@U20) with high symmetry (Ih) for M = Mg2+, Ag+, Na+ and E = S2-, Se2-, Te2-, Po2-.
- Predicted novel high-spin nanoclusters, including S@Mn12@Pu20, exhibiting the highest ground state spin reported for molecular clusters.
Conclusions:
- Successfully designed and characterized new families of stable actinide nanoclusters with tunable properties.
- Demonstrated the potential of Matryoshka-type structures for achieving ultra-high spin states in molecular systems.
- The S@Mn12@Pu20 nanocluster represents a significant advancement in the pursuit of molecular magnetic materials.
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