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相关概念视频

Precipitation Gravimetry01:03

Precipitation Gravimetry

6.6K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.6K
Formation of Complex Ions03:45

Formation of Complex Ions

23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
Valence Bond Theory02:42

Valence Bond Theory

8.6K
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...
8.6K
Electrodeposition01:08

Electrodeposition

640
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
640
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.9K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.9K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.5K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.5K

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相关实验视频

Updated: Jul 10, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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尼克尔的电还原合成(0) 复合物

Camille Z Rubel1,2, Yilin Cao1, Tamara El-Hayek Ewing1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.

Angewandte Chemie (International ed. in English)
|November 20, 2023
PubMed
概括

电解提供了一种可复制和可扩展的方法,可以从盐中合成(0) 预催化剂,取代危险的试剂,并使有机合成中得到更广泛的应用.

关键词:
电化学 电化学 电化学流动化学 流动化学绿色化学 绿色化学催化剂 催化剂预催化剂 预催化剂 预催化剂

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets

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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
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Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets

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科学领域:

  • 有机金属化学 有机金属化学
  • 催化剂是一种催化剂.
  • 电化学 电化学 电化学

背景情况:

  • 催化剂对于有机转化至关重要,Ni () 0来源是有效的前催化剂.
  • 传统的Ni(0) 预催化剂合成依赖于酸化减少剂,这给安全性和原子经济带来了挑战.
  • 现有的方法往往缺乏可重现性,需要冷温度.

研究的目的:

  • 开发一种可扩展,可重复和更安全的方法来合成低价值前催化剂.
  • 建立一种电化学路径,从易于获得的Ni (II) 盐中产生Ni (II) 复合物.
  • 为了促进催化在有机合成中的更广泛应用.

主要方法:

  • 使用电解减少Ni (II) 盐的制剂尺度.
  • 电化学过程的稳定性和可重复性的标准化.
  • 开发一种用于大规模合成的电化学循环流过程.
  • 实施一个用于产生催化的现场减少协议.

主要成果:

  • 成功合成了各种Ni (0) 和Ni (II) 复合物,包括bis (1,5-环氧八) (0) [Ni (COD) ] .
  • 展示一个强大的和可重复的电化学方法,用于Ni(0) 前催化剂的制备.
  • 该方法的可扩展性通过电化学循环流过程.
  • 对于催化应用,在现场生成Ni的可行性.

结论:

  • 电化学还原为合成Ni(0) 前催化剂的传统方法提供了一种优越的替代方案.
  • 这种方法提高了有机金属复合制剂的安全性,可重复性和可扩展性.
  • 预计开发的方法将加速在研究和工业中采用电化学来合成低价值复合物.