来源：ACS PublicationsMixed valency in compounds containing rare-earth elements can lead to intriguing properties, such as complex magnetism, unique charge transport, and superconductivity. Zintl A14MPn11 (14–1–11) compounds with rare-earth elements exhibit mixed or intermediate valence at the A cation sites, which affects their magnetic and transport properties. In this study, we report on the valence state of Eu cations and the magnetic properties of 14–1–11 Zintl arsenides, Eu14MAs11 (M = Mg, Zn, Cd). 151Eu Mössbauer spectroscopic analysis indicates the presence of intrinsic Eu2+ and Eu3+ cat...
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2026
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来源：ACS PublicationsEfficient and green separation of rare earth elements (REE) remains a critical challenge, with conventional solvent extraction relying heavily on toxic organic solvents. Herein, three biomimetic peptides (NF-H1, NF-H2, and NF-H3) integrating the Nap-FF hydrophobic assembly motif with EF-hand-derived REE-recognition sequences were designed for fully aqueous REE separation. The peptides form stable, preassembled β-sheet scaffolds via Nap-FF-mediated hydrophobic interactions and intermolecular hydrogen bonding, within which specific coordination of RE3+ with EF-hand side-chain ...
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2026
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来源：ACS PublicationsRare-earth activation in oxide thin films is often optimized empirically, although excitation-dependent upconversion (UC) is ultimately constrained by the near-surface energetic landscape and defect-mediated screening. Here, we identify a quantitative correlation that links defect chemistry and surface electrostatics to UC saturation kinetics in BaTiO3-based thin films. By combining XPS (high-binding-energy O 1s fraction and valence-band offsets), Kelvin probe force microscopy (contact potential difference and work function), Raman-Fano analysis (vibronic asymmetry), and exc...
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2026
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Electronic Pre-Activation of −COOH Ligands by O–H···O in Natural Deep Eutectic Solvents for Enhanced Rare-Earth Coordination: A Quantum-Chemical Study 来源：ACS PublicationsNatural deep eutectic solvents (NaDESs) are commonly regarded as passive solvation media. However, their local hydrogen bonds may act as electronically structured environments that can perturb embedded ligands. Herein, using quantum-chemical analysis, finite-cluster calculations suggest that selected O–H···O motifs can polarize RCOOH in a manner consistent with partial RCOO– like redistribution. T...
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2026
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