Novel cesium cerium(iv) iodate Cs2Ce(IO3)6: hydrothermal synthesis, crystal structures and thermal stability†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2024-09-02 DOI:10.1039/D4CE00722K

Oksana P. Grigorieva, Larisa V. Shvanskaya, Tatiana B. Shatalova, Andrey A. Zolotarev, Peter S. Berdonosov and Valery A. Dolgikh

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Abstract

New cesium cerium(IV) iodate Cs₂Ce(IO₃)₆ was successfully prepared by applying a hydrothermal technique from starting reagents CsF, CeO₂, H₅IO₆ and HIO₃ at 230 °C. Cs₂Ce(IO₃)₆ was analyzed via single crystal and powder XRD, EDX, IR spectroscopy and thermal analysis. The new compound crystallizes in the monoclinic space group C2/c with a = 14.0652(3) Å, b = 8.1890(2) Å, c = 17.7211(4) Å, β = 103.601(2)°, V = 1983.99(8) Å³, and Z = 4. The crystal structure of Cs₂Ce(IO₃)₆ consists of CeO₈ square antiprisms sharing their apexes and edges with trigonal pyramidal IO₃⁻ groups to form layers [Ce(IO₃)₆]²⁻ parallel to the ab plane. These layers are further stabilised by a 12-vertex polyhedron, CsO₁₂, situated in their voids. The IR spectrum of Cs₂Ce(IO₃)₆ displays iodate group bands. According to DTA analysis, cesium cerium(IV) iodate exhibits high thermal stability in the air at temperatures up to 414 °C.

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新型碘酸铯铈 (IV) Cs2Ce(IO3)6：水热合成、晶体结构和热稳定性

以 CsF、CeO2、H5IO6 和 HIO3 为起始试剂，在 230°C 下通过水热技术成功制备了新型碘酸铯铈 (IV) Cs2Ce(IO3)6。通过单晶和粉末 XRD、EDX、红外光谱和热分析对 Cs2Ce(IO3)6 进行了分析。新化合物在单斜空间群 C2/c 中结晶，a = 14.0652 (3) Å, b = 8.1890 (2) Å, c = 17.7211 (4) Å, β = 103.601 (2)o, V = 1983.99 (8) Å3, Z = 4。Cs2Ce(IO3)6 的晶体结构由 CeO8 方形反棱柱组成，它们的顶点和边缘与三棱锥 IO3- 基团共享，形成平行于 ab 平面的 [Ce(IO3)6]2- 层。位于空隙中的 12 个顶点多面体 CsO12 进一步稳定了这些层。Cs2Ce(IO3)6 的红外光谱具有碘酸根带。根据 DTA 分析，碘酸铯铈（IV）在空气中具有很高的热稳定性，温度可达 414°C。

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