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在I型类酸盐结构中的封装:Na5.5(H2)2.15Si46:合成和表征
Doinita Neiner1, Norihiko L Okamoto, Cathie L Condron
1Department of Chemistry, University of California, Davis, California 95618, USA.
Journal of the American Chemical Society
|October 26, 2007
概括
合成了一种新型的封装甲酸盐,Na5.5(H2) 2.15Si46,在环境条件下稳定. 这种材料在其结构中具有移动气,为新应用提供了潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 无机化学 无机化学 有机化学
背景情况:
- 克拉特体是类似子的结构,其中的客原子或分子被封装在内.
- 类聚合物具有独特的结构特性,并具有各种应用的潜力.
- 在无机框架内封装气带来挑战和机遇.
研究的目的:
- 为了合成和表征一种新封装的无机克拉酸盐.
- 为了确定合成的酸盐的结构和客人占用率.
- 为了研究用封装的类甲酸盐的稳定性和性能.
主要方法:
- 在300°C的动态真空下通过NaSi和NH4Br的反应合成.
- 使用Rietveld精细化粉末X射线衍射数据的结构确定.
- 使用固态核磁共振 (NMR) 谱学 (23Na,1H,29Si) 和扫描传输电子显微镜 (STEM) 的表征.
主要成果:
- 成功合成了Na5.5(H2) 2.15Si46,一种缺乏的,用封装的I型类甲基酸盐.
- 瑞特维尔德的精细化证实了I型酸盐结构,具有明显的大 (6d) 和小 (2a) 子.
- 核磁共振和STEM分析证实大中的移动存在,小中的占用,大中的缺乏.
结论:
- 一种稳定的,用封装的类聚合物已在高产量中准备好.
- 这项研究阐明了酸盐中的客人占用率,揭示了移动.
- 这项工作有助于理解无机酸盐材料中的储存.
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