Magnetic Properties and Electronic Structure of Neptunyl(VI) Complexes: Wavefunctions,Orbitals, and Crystal‐Field Models |
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Authors: | Dr. Frédéric Gendron Dr. Dayán Páez‐Hernández Dr. François‐Paul Notter Dr. Ben Pritchard Dr. Hélène Bolvin Prof. Dr. Jochen Autschbach |
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Affiliation: | 1. Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY 14260‐3000 (USA);2. Laboratoire de Physique et de Chimie Quantiques, Université Toulouse 3, 118 Route de Narbonne, 31062 Toulouse (France);3. Laboratoire de Chimie Quantique, Université de Strasbourg, 1 Rue Blaise Pascal, 67008 Strasbourg (France) |
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Abstract: | The electronic structure and magnetic properties of neptunyl(VI), NpO22+, and two neptunyl complexes, [NpO2(NO3)3]? and [NpO2Cl4]2?, were studied with a combination of theoretical methods: ab initio relativistic wavefunction methods and density functional theory (DFT), as well as crystal‐field (CF) models with parameters extracted from the ab initio calculations. Natural orbitals for electron density and spin magnetization from wavefunctions including spin–orbit coupling were employed to analyze the connection between the electronic structure and magnetic properties, and to link the results from CF models to the ab initio data. Free complex ions and systems embedded in a crystal environment were studied. Of prime interest were the electron paramagnetic resonance g‐factors and their relation to the complex geometry, ligand coordination, and nature of the nonbonding 5f orbitals. The g‐factors were calculated for the ground and excited states. For [NpO2Cl4]2?, a strong influence of the environment of the complex on its magnetic behavior was demonstrated. Kohn–Sham DFT with standard functionals can produce reasonable g‐factors as long as the calculation converges to a solution resembling the electronic state of interest. However, this is not always straightforward. |
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Keywords: | ab initio calculations actinides density functional calculations electronic structure magnetic properties |
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