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通过反氧活性联体介导的乌拉尼尔功能化:通过化生成OC键
Ezra J Coughlin1, Yusen Qiao2, Ekaterina Lapsheva2
1H.C. Brown Laboratory, Department of Chemistry , Purdue University , West Lafayette , Indiana 47907 , United States.
Journal of the American Chemical Society
|December 12, 2018
概括
研究人员用氧化还原活性胺基联体合成了乌拉尼尔化合物. 观察到基于基的减少,但仍然是六价的,直到反应导致基键裂变和U (VI) 到U (IV) 的减少.
科学领域:
- 无机化学
- 有机金属化学
- 材料科学
背景情况:
- 化合物在核科学和催化中至关重要.
- 了解复合物的电子结构和反应性是开发新应用的关键.
- 氧化还原活性连接物为金属复合物提供可调节的特性.
研究的目的:
- 合成和描述具有氧化还原活性胺基联体的新化合物.
- 阐明电子结构并确定这些复合体中氧化还原事件的性质.
- 研究这些乌拉尼尔复合物的反应性,特别是关于乌拉尼尔键.
主要方法:
- 合成乌拉尼尔-伊米诺复合物
- 多核核磁共振,电子吸收光谱学,SQUID磁力测量和X射线晶体学用于表征.
- 用B-chlorocatecholborane和pivaloyl chloride进行反应性研究.
- 同位素标记 (18O) 和IR,用于机械研究的质谱学.
主要成果:
- 成功合成和表征伊米诺基,伊米诺基和阿米多酸复合物.
- 电子结构分析证实了基于联体的氧化还原活性,而仍然处于U (VI) 状态.
- 与特定的试剂的反应诱导了U-O乌拉尼尔键裂变,将U(VI) 降低到U(IV),并氧化了连接体.
- 同位素标记证实了在键激活过程中从基组转移到有机副产品的氧气.
结论:
- 具有氧化还原活性胺基配体的乌拉尼尔复合体具有可调节的电子特性.
- 基于基的氧化还原过程占主导地位,在某些条件下保持U(VI) 的氧化状态.
- 烯酸结合激活可能发生,导致U(IV) 形成和U-O结合裂变,对催化循环有影响.
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