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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >NaSeC_2H: A Crystalline Compound with Disordered ~-SeC_2H Anions
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NaSeC_2H: A Crystalline Compound with Disordered ~-SeC_2H Anions

机译：Nasec_2H：具有无序〜-Sec_2h阴离子的结晶化合物

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摘要

By reaction of NaC_2H with elemental selenium (grey or red) in liquid ammonia a crystalline brownish powder of NaSeC_2H was obtained. The existence of the new ~-SeC_2H anion - recently discovered in A~ISeC_2H (AI = K, Rb, Cs) - was confirmed by IR spectra showing the expected C≡C, C-H, and C-Se vibrations. A synchrotron powder diffraction pattern (SNBL, ESRF/Grenoble) was indexed in a cubic unit cell with a = 7.044 ?. Analysis of the data led to a pyrite-type structure (Pa3, Z = 4) with a static orientational disorder of the ~-SeC_2H anions over two positions. No phase transition was observed upon cooling to 100 K, where essentially the same structure was obtained with a = 6.989 ?. Upon heating, NaSeC_2H releases C_2H_2 as revealed by thermal analysis (DSC/TGA) resulting in potential Na_2Se_2C_2 crystallizing in a small cubic unit cell with a ≈ 3.899 ? similar to findings on the decomposition of the other A~ISeC_2H compounds.
机译：在液氨中，NaC_2H与元素硒（灰色或红色）反应，得到结晶的褐色NaSeC_2H粉末。最近在A~ISeC_2H（AI=K，Rb，Cs）中发现的新的~-SeC_2H阴离子的存在，通过红外光谱证实了预期的C≡C、 C-H和C-Se振动。同步加速器粉末衍射图（SNBL、ESRF/格勒诺布尔）在一个A=7.044？的立方晶胞中进行了索引？。对数据的分析导致了黄铁矿型结构（Pa3，Z=4），两个位置上的~-SeC_2H阴离子存在静态取向无序。冷却至100K时未观察到相变，在a=6.989？时获得了基本相同的结构？。热分析（DSC/TGA）显示，加热后，NaSeC_2H会释放出C_2H_2，导致Na_2Se_2C_2在具有≈ 3.899 ? 与其他A~ISeC_2H化合物的分解结果类似。

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