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Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

661
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
661
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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(2) 转移利用一个明确定义的前体.

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概括

通过使用异金属来控制 (II) 转移,提高了低价值的化学性. 一个三金属/框架选择性地转移碎片,使新的合成途径.

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科学领域:

  • 主要组化学主要组化学
  • 有机金属化学 有机金属化学
  • 低价值的化合物是一种低价值的化合物.

背景情况:

  • 选择性生成和转移低价值 (II) 碎片是主要组化学中尚未探索的领域.
  • 控制的转移对于开发选择性化和功能化策略至关重要.
  • 了解主组反应性为新型合成和催化平台提供了概念指导.

研究的目的:

  • 研究异金属作为控制低价值反应性的结构模板的作用.
  • 为了证明选择性转移的 (II) 碎片使用共价/框架.
  • 为了探索-化合物的核度依赖的反应性.

主要方法:

  • 三金属的合成和表征 [{N(TMS) 2}) 2Cd (1tri) 和双金属的 [{N(TMS) 2}2}] (1bi) 的化合物.
  • 1tri与自由基,二基因化物和衍生物的反应,以诱导转移.
  • 密度功能理论 (DFT) 研究以阐明反应机制,电子结构和化合物稳定性.

主要成果:

  • 三金属化合物1tri通过挤出选择性地转移复杂碎片.
  • 与各种基质的反应证实了从1tri转移的实用性,包括 () 基的自旋捕获.
  • 双金属化合物1bi具有明显的反应性,促进转移而不是转移,突出显示核性依赖.

结论:

  • 异金属可以有效地模板和直接低价值反应在共价框架内.
  • 三金属Al/Cd化合物为选择性 (II) 碎片转移提供了一个平台,扩大了合成可能性.
  • 核性在确定-化合物的转移行为方面发挥着关键作用.