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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

11.6K
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...
11.6K
Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.1K
Common Ion Effect03:24

Common Ion Effect

41.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.4K
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

783
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
783
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.3K
Polyprotic Acids03:38

Polyprotic Acids

29.1K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
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相关实验视频

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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的氧化源依赖多态和相稳定性 (II) 在扩散驱动系统中的氧化.

Akshay K Dimble1, Nikhil D Bagul1, Prasad C Walimbe1

  • 1Post Graduate and Research Center, Department of Chemistry, S. P. Mandali's, Sir Parashurambhau College, Tilak Road, Pune, Maharashtra 411 030, India.

Langmuir : the ACS journal of surfaces and colloids
|August 20, 2024
PubMed
概括

可同时合成二氧化多态 (α-和β-Co(OH) 2) 可以同时合成. OH-来源决定了所产生的多态,影响结构和降水模式,氨酸使独特的Liesegang带形成.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 二氧化以两个主要的多态存在:蓝绿色的α-Co(OH) 2和红色的β-Co(OH) 2.
  • 这些多态体具有不同的分层结构,具有不同的层间画廊间距.
  • 之前的研究经常将这些形式单独合成,α-Co(OH) 2有时转换为更稳定的β-形式.

研究的目的:

  • 在相同的条件下实现α-和β-Co(OH) 2多态的同时合成.
  • 为了研究氧化离子 (OH-) 源对多态形成的影响.
  • 探索反应-扩散框架,用于控制合成氧化多态物.

主要方法:

  • 使用1D反应-扩散框架进行同时的多态合成.
  • 采用了各种外部电解质,专注于不同来源和度的OH (NaOH,NH,OH,水).
  • 描述合成产品以确认形态,结构和化学环境.

主要成果:

  • Co(OH) 2的多态化学是严重依赖OH-来源和度,而不是其他反应参数.
  • NaOH和NH4OH仅产生α-Co(OH) 2,分别具有明显的连续和周期性降水.
  • 氨酸 (HYZ) 导致α-和β-Co(OH) 2的Liesegang带,在更高的HYZ度下,α-Co(OH) 2转化为β-Co(OH) 2.

结论:

  • OH-源是同时合成Co(OH) 2多态的主要决定因素.
  • 与特定OH-来源的反应-扩散提供了一种控制多形态形成和形态学的途径.
  • 在HYZ系统中观察到的α-转化为β-Co(OH) 2的转化提供了对相变换机制的见解.