来源：ACS PublicationsThe rare-earth elements (REEs) are classified as light REEs (LREEs), middle REEs (MREEs), and heavy REEs (HREEs) based on their ionic radii and chemical behavior. The selective separation of MREEs from complex REE mixtures is challenging. We report the application of the dual-size-selective chelator macrotripa for selective aqueous precipitation-based separations of MREEs. Extended X-ray absorption fine structure (EXAFS) spectroscopy measurements confirmed that macrotripa adopts distinct conformations for large and small REEs in aqueous solution, resulting in weak binding to...
Release time:
2026
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来源：ACS PublicationsM@Cu2S electrocatalysts were theoretically designed by substituting a surface Cu atom on the Cu2S(111) facet with a rare-earth M atom. All M@Cu2S electrocatalysts exhibit favorable structural stability, with negative formation energies and binding energies. On M@Cu2S, the unique bridge-bonded adsorption configuration (both O atoms of *CO2 are bonded to M) enables effective activation of *CO2, with the hydrogenation step, rather than the C–C coupling step, identified as the potential-determining step (PDS) for ethylene electrocarboxylation. Notably, Eu@Cu2S and Yb@Cu2S exhibi...
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2026
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来源：ACS PublicationsWe report the magneto-optical characterization of a homoleptic europium terpyridine complex in +3, +2, and formally 0 oxidation states. Magnetic circular dichroism (MCD) analysis of the f–f transitions of the Eu(III) complex revealed an effective D3h local symmetry in solution, higher than suggested by the solid-state structure, through the splitting pattern of its 7F0→5D2 transition. The Eu(II) complex, by contrast, exhibited broad MCD features spanning the visible region arising from 4f7[8S7/2]→4f6[7FJ]×ψ1 transitions (ψ = 5d or Lπ*, J = 0–6). We show theoretically an...
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2026
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来源：ACS PublicationsControlling chemical homogeneity during aqueous coprecipitation of oxide nanoparticles remains challenging due to unintended byproducts that impact the microstructure and functionality of the final materials. Hence, precise tuning of structural, optical, and catalytical properties requires not only accurate knowledge of how such impurities evolve under annealing, but also effective strategies for defect engineering. Here, we demonstrate how hydroxylation and carbonation affect the internal structure and optical properties of YVO4 nanoparticles synthesized using different van...
Release time:
2026
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