Dalton Transactions最新文献

The luminescent phase of the blue-emitting phosphor BaMgSi₄O₁₀:Eu²⁺, the structure of which was previously reported to be a gillespite (BaFeSi₄O₁₀)-type structure, has been identified by detailed investigations through single-crystal X-ray diffraction (XRD) analysis, powder Rietveld analysis and luminescence measurements. The actual blue-emitting phase was newly found to be BaMgSi₃O₈:Eu²⁺, whose host lattice has a triclinic alkali feldspar-type structure.

Despite their high theoretical energy density, the commercial viability of lithium–sulfur batteries (LSBs) is impeded by issues of poor sustainability, primarily stemming from the shuttle effect of lithium polysulfides. To address this challenge, we have developed a novel copper phosphide (CuP₂) electrocatalyst. Through ball-milling, CuP₂ is synthesized with copper- and oxide-based catalytic surface active sites that demonstrate strong adsorption of lithium polysulfides. This enhanced adsorption effectively suppresses the shuttle effect, leading to significant improvements in battery lifespan and initial capacity. By optimizing the CuP₂ content in the interlayer to 10 wt%, enhanced cell reversibility is achieved. A coin cell fabricated with the optimized interlayer delivers an initial capacity of 964 mAh g⁻¹ and maintains a robust capacity of 600 mAh g⁻¹ after 500 cycles at a 0.5 C rate. Critically, the practical applicability of this approach is confirmed in a pouch cell, where the areal capacity is doubled to 2.2 mAh cm⁻² with the inclusion of the CuP₂ catalyst. This work, therefore, presents a new avenue for the rational design of highly efficient electrocatalysts for next-generation LSBs.

The separation of acetylene (C₂H₂) and carbon dioxide (CO₂) is quite challenging due to their similar physical properties. Metal–organic frameworks (MOFs) have emerged as promising porous adsorbents for C₂H₂/CO₂ separation, and the discovery of new frameworks is vital to unlocking their full potential. Herein, we synthesize a magnesium (Mg)-based MOF, namely UPC-116, with 2,1,3-benzothiadiazole-4,7-dicarboxylic acid (H₂BTDC) as ligand. The diversified coordination modes of H₂BTDC and Mg²⁺ afford UPC-116 with one-dimensional square channels of 9 Å. Static adsorption tests and theoretical calculations collaboratively evidence the promising prospect of UPC-116 for efficient C₂H₂/CO₂ separation.

This work reveals the first example of an interzeolite-type transformation between microporous heteropolyhedral silicates. In KOH solution, preformed spherulitic particles of the microporous titanosilicate ETS-4 (Engelhard Titanium Silicate-4) transform into single crystals of GTS-1 (Grace Titanium Silicate-1). Mechanistically, the transformation follows a distinct reversed crystallization pathway, beginning on the surface of a seed particle and ending in the reconstructive self-assembly of multiple single crystals. In addition to advancing synthesis methodologies for microporous titanosilicates, this work provides mechanistic insights into a crystallization route that enables templating of the crystal morphology through particle self-assembly.

This work investigates the substituent effect on the boron atom toward the electronic structure and optical properties of boron-bridged hexazene derivatives (B₂N₆). DFT studies revealed that the substituents on the boron atom strongly affect the energy level of the N₆-centered π system and alter the absorption/emission spectra. In addition, cyclic voltammetry demonstrates the electron-accepting character of the B₂N₆ scaffold.