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- W2023136804 abstract "Extensive synchrotron (28 K) and conventional sealed-tube (9 K) X-ray diffraction data have been collected on Th(S(2)PMe(2))(4). Modeling of the electron density of the complex shows the bonding is quite ionic with little diffuse f or d type bonding density. Furthermore a large polarization of the Th core is observed revealing some 5d-like involvement in the bonding. High-quality ab initio density functional calculations are not able to reproduce these features and instead predict rather covalent bonding with considerable 6d-5f mixing. The study suggests that this theoretical method exaggerates the covalent nature of actinide bonds. It is shown that the most direct measure of covalence-charge transfer and electron distributions-can be usefully estimated by X-ray diffraction even in this most unfavorable of cases, where many actinide core electrons are present. The use of very low temperature data is crucial in the study of heavy metal complexes in order to minimize systematic errors such as thermal diffuse scattering and anharmonicity. The fact that accurate synchrotron radiation diffraction data can be measured within days makes studies of compounds beyond the first transition series more frequently within reach." @default.
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- W2023136804 date "1998-08-11" @default.
- W2023136804 modified "2023-09-23" @default.
- W2023136804 title "Characterization of Actinide Bonding in Th(S<sub>2</sub>PMe<sub>2</sub>)<sub>4</sub> by Synchrotron X-ray Diffraction" @default.
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- W2023136804 doi "https://doi.org/10.1021/ic9715613" @default.
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