来源：ACS PublicationsRare-earth delafossites, ARCh2; A = alkali metal, R = rare-earth, Ch = chalcogen which consist of intercalated rare-earth metal dichalcogenides, host frustrated triangular lattices that are fertile ground for exotic phenomena. In most cases, the triangular rare-earth sublattice arises from R-3m (No. 166) structures with three layers of rare-earth metal dichalcogenide octahedra or P63/mmc (No. 194) structures with two such layers, analogous to those found in transition metal dichalcogenides. Substituting the alkali metal with Cu+ yields a distinct trigonal crystal symmetry─P-...
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2025
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A Trifunctional, Rare-Earth Theranostic Chelator Platform to Enable Diagnostic Nuclear Imaging, Surgical Resection, and Radiotherapy 来源：ACS PublicationsHere, we establish a single-molecule, trifunctional platform compatible with diagnostic positron emission tomography (PET), optical imaging-assisted intrasurgical resection, and chelation of radiotherapeutic rare-earth nuclides. Building on previous pyridylalkynylaryl (PEPA) antenna scaffolds, mono- and bisantenna analogs incorporating either PEPA or methoxy-substituted MEPA chromophores were prepared to assess the role of pyridylalkynylaryl nu...
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2025
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来源：ACS PublicationsDeveloping robust oxygen evolution reaction (OER) catalysts for proton exchange membrane water electrolysis (PEMWE) demands concurrent mitigation of insufficient activity and structural instability in acidic media. Herein, we propose a spin-state engineering strategy enabled by rare-earth doping to resolve the intrinsic activity-stability trade-off dilemma. Incorporation of rare-earth cations (Sm3+, Nd3+, Ho3+) into MnCo2O4.5 enhances Co–O covalency and 4f–3d coupling, increasing the crystal-field splitting and driving the Co sublattice from a purely high-spin Co2+/Mn4+ towa...
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2025
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来源：ACS PublicationsThe complexation behavior of three types of organic matter from the International Humic Substances Society standards and Reference materials was investigated with Eu3+, Tb3+, and Dy3+ ions under different pH conditions. These elements were selected as representative trivalent lanthanides of environmental concern due to their increasing occurrence in aquatic systems from technological waste. Experiments were conducted at pH values of 4, 5, and 6, with a constant ionic strength of 0.01 M NaClO4. Using fluorescence quenching combined with PARAFAC statistical analysis, the appar...
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2025
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