更重的13组元素的稳定单核基离子:[(tBu2MeSi) 3E.-]. [K+(2.2.2-Cryptand) ] (E=Al,Ga) (E=Al,Ga) 这是一个非常简单的方法
Masaaki Nakamoto1, Tomoki Yamasaki, Akira Sekiguchi
1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
Journal of the American Chemical Society
|May 12, 2005
概括
研究人员合成了第一个可分离的单核基离子,来自13组较重的元素,三和. 这些稳定,深红色的水晶在它们的根中心周围呈现出几乎平面的几何形状.
科学领域:
- 有机金属化学 有机金属化学
- 主群 化学 化学
- 激进化学 激进化学是什么
背景情况:
- 13 组元素通常呈现 +3 氧化状态.
- 更重的13组元素的单核基离子在很大程度上是未被探索的.
- 对于稳定反应性物种而言,硬质要求较高的连接体至关重要.
研究的目的:
- 合成和描述和的第一个可分离的单核基离子.
- 研究这些新型物种的结构和电子特性.
- 为了探索大型基替代剂对13组基离子稳定性的影响.
主要方法:
- 使用金属 (Li,Na,K) 来减少三和的单电子减少.
- 分离和结晶的盐的基离子离子.
- 对于分子结构的确定,X射线晶体学.
- 电子偏磁共振 (EPR) 谱学用于电子表征.
主要成果:
- 形成和分离深红色,对空气和水分敏感的[tBu2MeSi) 3Al*-] (3) 和[tBu2MeSi) 3Ga]*- (4) 晶体作为盐.
- X射线结晶学揭示了Al和Ga激素中心周围的几乎平面几何形状.
- 对于Al-27和Ga-69/71,EPR光谱显示了具有特定g值和超细合常数的特征信号,与平面结构一致.
结论:
- 这些基离子的成功合成和分离,代表了13组较重元素化学的重大进步.
- 重的二三-丁甲基基连接物有效地稳定了这些前所未有的单核基离子.
- 根中心的平面几何学得到了结构和光谱数据的证实.
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