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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.2K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.2K
Valence Bond Theory02:42

Valence Bond Theory

11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.0K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.0K
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

584
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...
584

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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了解桥接鲁 (II) 复合体中基导向激发状态电子流的理解

Hailey M Bierling1, Andrea R Dorsa2, John LaCoursiere3

  • 1Department of Chemistry, Villanova University, 800 E Lancaster Ave, Villanova, Pennsylvania 19085, United States.

Inorganic chemistry
|December 2, 2025
PubMed
概括
此摘要是机器生成的。

研究人员设计了复合物来控制光驱化学反应. 电子捐赠的替代物促进电荷转移,而电子吸收的替代物将激发状态定位,在催化中提供分子水平的控制.

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科学领域:

  • 摄影化学的使用.
  • 协调化学 协调化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 高效的光捕获和有针对性的能量转移对于推动分子系统中的化学反应至关重要.
  • 桥梁双金属复合体为控制光物理过程提供可调节的平台.

研究的目的:

  • 为了合成和研究四氧化[3,2-a:2',3'-c:3'',2''-h:2'',3'''-j]phenazine (tpphz) -桥梁双金属复合物.
  • 探索取电子 (EW) 和电子捐赠 (ED) 替代物对远距离连接体对电子流和兴奋状态动态的影响.
  • 为了阐明这些复杂的受控光驱反应中的兴奋状态机制.

主要方法:

  • 合成tpphz桥接双金属Ru复合物与多种EW/ED替代聚烯联体.
  • 密度函数理论 (DFT) 和时间依赖的DFT (TD-DFT) 用于电子过渡分析.
  • 循环电压测量和短暂吸收光谱学用于电化学和光物理特性.

主要成果:

  • 激发状态局部化在EW替代的远端配体上;电荷转移到tpphz桥,由ED替代物促进.
  • Ru中心的双电子氧化与替代性相关 (EW/ED).
  • 激发状态的寿命根据远距离连接物替代物而异;在大多数复合体中观察到电子转移到tpphz桥.

结论:

  • 在过渡金属复合体中对激发状态电子转移控制的分子层面的理解.
  • 通过远端配体的战略选择,证明了光物理性质的可调性.
  • 为设计高效的光驱分子系统和催化剂提供了基础.