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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
925
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
20.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.2K
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...
26.2K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

7.9K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
7.9K
Stereoisomerism02:52

Stereoisomerism

11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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相关实验视频

Updated: Jun 12, 2025

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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调铜中的协作能量转移 (I) 复合体使用基于二胺的双光子吸收二胺基联体敏感剂.

Noémie Beaucage1, Zujhar Singh1, Jérémie Bourdon1

  • 1Noémie Beaucage, Dr. Zujhar Singh, Jérémie Bourdon and Prof. Dr. Shawn K. Collins, Department of Chemistry and Centre for Green Chemistry and Catalysis, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal.

Angewandte Chemie (International ed. in English)
|September 18, 2024
PubMed
概括

研究人员开发了新的铜复合体,使用专门的二光子向上转换的配体. 这一进步使可见光下高效的光催化成为可能,为更绿色的化学合成铺平了道路.

关键词:
铜铜 铜铜的铜.转移能量转移能量是什么?光催化作用的光催化作用红灯是红色的,红灯是红色的.两个光子吸收.

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Quantifying the Binding Interactions Between CuII and Peptide Residues in the Presence and Absence of Chromophores
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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科学领域:

  • 摄影化学的使用.
  • 有机金属化学 有机金属化学
  • 可持续的合成 可持续的合成

背景情况:

  • 低能光光催化提供了更安全,更可持续的合成路线.
  • 两光子吸收 (TPA) 连接体对于高效的光收获至关重要.
  • 铜复合物是有机转化中的多功能催化剂.

研究的目的:

  • 合成和表征新的铜复合体,用一种源于类素的配体,bathocupSani.进行合成和表征.
  • 为了研究这些复合体的两光子吸收和向上转换特性.
  • 探索这些复合物的应用在可见光介导光催化中.

主要方法:

  • 合成巴托库普桑尼联体及其铜复合物 ([Cu(巴托库普桑尼) ((DPEPhos) ]BF4和[Cu(巴托库普桑尼) ]BF4).
  • 光谱表征包括两光子吸收截面的测定.
  • 使用红光辐射的光催化反应.

主要成果:

  • 联体和同质铜复合体[Cu(bathocupSani) ]BF4表现出高效的两光子向上转换,具有1.2 eV的反斯托克斯转移.
  • [Cu(bathocupSani) 2BF4复合体在各种光催化转化中表现出有效性.
  • 成功的应用包括基胺的氧化二元化,硫化物,素和酸氧化,以及原子转移激素的添加.

结论:

  • 含有 bathocupSani 连接体的铜复合体是有效的双光子染色体.
  • 使用这些复杂物体的可见光光催化剂为各种有机反应提供了可持续的替代方案.
  • 开发的系统突出了TPA材料在推进绿色化学方面的潜力.