来源：ACS PublicationsEu2P2S6 exists in centrosymmetric (P21/c) and noncentrosymmetric (Pc) polymorphs whose [EuS8] and [P2S6] building blocks are virtually identical; the sole distinction is a symmetry breaking assembly governed by weak interactions. Quasi-harmonic free-energy calculations indicate the noncentrosymmetric phase is only ∼0.09 eV per cell above the centrosymmetric ground state, revealing marginal metastability, while first-principle atom response theory predicts a moderate second harmonic generation coefficient (deff ≈ 0.9 pm V–1). Strong 4f electron correlation induces pronounced ...
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2026
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来源：ACS PublicationsThe search for rare-earth triangular-lattice antiferromagnets continues to attract considerable attention owing to their potential for hosting exotic magnetic ground states. Here, we report the synthesis, crystal structure, and magnetic properties of the tellurate series, K3RETe2O9 (RE = Pr, Nd, and Gd–Yb), which crystallizes in a hexagonal (P63/mmc) structure. In the structure, the RE3+ ions form a large triangular lattice in the ab plane, with nearest-neighbor RE–RE distances ranging from 6.0429 to 5.9082 Å. Magnetization measurements reveal dominant antiferromagnetic...
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2026
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来源：ACS PublicationsAnhydrous, donor-free rare earth iodides are key precursors for rare earth chemistry and functional materials, but their scalable synthesis is challenging because these salts are extremely sensitive to air and moisture. In addition, most established routes rely on toxic, corrosive, or otherwise nonbenign reagents. Here, we report a ZnI2-mediated solid-state route to rare earth iodides in which ZnI2 acts simultaneously as the iodide source and oxidant, enabling a simple and scalable preparation. This approach leverages the good safety profile and low melting point of ZnI2 and...
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2026
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来源：ACS PublicationsKinetic resolution polymerization (KRP) of nonpolar conjugated dienes remains a significant challenge because of their flexible coordination modes and subtle reactivity differences between isomers. Herein, we report that by fine-tuning ligand steric environments and metal centers, the KRP of naturally occurring (E,Z)-β-ocimene (E/Z-Oc) was successfully realized by using catalysts 1 and 5 to afford a stereoregular E-homopolymer while simultaneously isolating a Z-isomer with high purity (95.5%). Moreover, complex 1 enabled to polymerize Z-Oc in highly isotactic trans-1,4 selec...
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2026
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