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相关概念视频

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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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...
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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用于选择性催化而定制的基于Pyrazolide的金属有机框架

Ning Huang1, Kecheng Wang1, Hannah Drake1

  • 1Department of Chemistry , Texas A&M University , College Station , Texas 77842-3012 , United States.

Journal of the American Chemical Society
|May 4, 2018
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概括

一个新的金属有机框架 (MOF),PCN-624,具有烯基组,显示出特殊的稳定性,并选择性地捕获客人. 这种强大的MOF能有效催化富勒烯-二合成,并且可回收利用.

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科学领域:

  • 材料科学
  • 超分子化学
  • 催化剂

背景情况:

  • 金属有机框架 (MOF) 为主机-客户应用提供可调节的多孔结构.
  • MOF的功能化增强了它们应对特定科学挑战的特性.

研究的目的:

  • 设计和合成一种新型的 perfluorophenylene-functionalized 金属酸MOF (PCN-624).
  • 调查PCN-624的结构,化学强度和捕捉客的选择性.
  • 评估PCN-624作为有机合成的异质催化剂.

主要方法:

  • 使用特定节点和链接器合理设计和合成PCN-624.
  • 关于MOF的结构性描述.
  • 在各种条件下 (溶剂,酸,) 评估化学稳定性.
  • 选择性客人捕获能力的评估.
  • 测试富勒烯-二合成中的催化活性和可回收性.

主要成果:

  • PCN-624已成功合成并进行结构特征,具有ftw-a拓网.
  • 在有机溶剂和水性酸溶液中,MOF表现出了显著的稳定性.
  • 化组制造出化纳米, 能够选择性地捕捉客人.
  • PCN-624有效地催化了富勒烯-二的合成,具有很高的选择性.
  • 催化剂在5个回收周期内保持活性,突出显示其稳定性.

结论:

  • PCN-624是一种高度稳定和功能化的MOF,具有选择性捕获客人的能力.
  • 这种MOF作为一种有效的异质催化剂,用于特定的有机转化.
  • 这项研究强调了MOF作为合成化学功能设计的多功能平台的潜力.