偏碲酸钡 Ba[TcO4]2 的合成、晶体结构和光学特性

IF 4.3 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Omega Pub Date : 2025-04-04 DOI:10.1021/acsomega.5c0048110.1021/acsomega.5c00481

Maurice Conrad, Thomas E. Albrecht and Thomas Schleid*,

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引用次数: 0

摘要

以放射性同位素纯净的99TcO2为原料，在氨水溶液中与H2O2氧化，然后在离子交换柱上进行阳离子复解，制备了高质量的无色标题化合物Ba[99TcO4]2单晶。单晶x射线衍射显示Ba[TcO4]2在正交空间群Fddd中同位素结晶为Ba[MnO4]2，晶格参数为Z = 8时a = 747.34(5) pm, b = 1244.08(7) pm, c = 1511.23(9) pm。其晶体结构特点是[BaO12]22 -二十面体被十个[TcO4] -四面体包围，通过两个边和八个角连接。紫外-可见光谱研究Ba[TcO4]2的光学性质表明，在这些离散的[TcO4] -阴离子中，O2 -→Tc7+配体到金属的广泛电荷转移（2p→4d）过程在最大吸收约350 nm处发生。

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Synthesis, Crystal Structure, and Optical Properties of the Barium meta-Pertechnetate Ba[TcO4]2

High-quality single crystals of the colorless title compound Ba[⁹⁹TcO₄]₂ were prepared from radioactive, isotope-pure ⁹⁹TcO₂ by oxidation with H₂O₂ in an aqueous ammonia solution and subsequent cation metathesis using an ion-exchange column. Single-crystal X-ray diffraction revealed Ba[TcO₄]₂ to crystallize isotopically to Ba[MnO₄]₂ in the orthorhombic space group Fddd with the lattice parameters a = 747.34(5) pm, b = 1244.08(7) pm, and c = 1511.23(9) pm for Z = 8. Its crystal structure features [BaO₁₂]^22– icosahedra surrounded by ten [TcO₄]⁻ tetrahedra connected via two edges and eight corners. The optical properties of Ba[TcO₄]₂ investigated by UV-vis spectroscopy show the broad O^2– → Tc⁷⁺ ligand-to-metal charge transfer (2p → 4d) process within these discrete [TcO₄]⁻ anions at an absorption maximum of around 350 nm.

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来源期刊

ACS Omega Chemical Engineering-General Chemical Engineering

CiteScore

6.60

自引率

4.90%

发文量

3945

审稿时长

2.4 months

期刊介绍： ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.