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相关概念视频

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

944
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
944
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.7K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.7K
Sulfur Assimilation01:20

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.6K
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

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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基于单原子的金属有机框架,用于高效的C-S交叉合.

Gobbilla Sai Kumar1, Deepak Kumar1, Aditya Thakur1

  • 1Hybrid Porous Materials Laboratory, Department of Chemistry, Indian Institute of Technology Jammu, Jammu & Kashmir, 181221, India.

Chemistry, an Asian journal
|December 23, 2024
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概括
此摘要是机器生成的。

在缺陷工程金属有机框架 (MOF) 上支持的单原子催化剂 (SAC) 在C-S合反应中表现出高活性和选择性. 这种稳定的催化剂在室温下有效运行,为未来的异质催化提供了洞察力. 关键词:单原子催化剂,MOFs,CS合.

关键词:
在C-S合器.密度函数理论 (DFT) 是一种密度函数理论.金属有机框架 (MOF) 是一种金属有机框架.一个原子催化剂 (SAC)稳定的稳定性 稳定的稳定性

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科学领域:

  • 不同质的催化剂.
  • 材料科学是一种材料科学.
  • 纳米技术纳米技术

背景情况:

  • 单原子催化剂 (SAC) 在催化过程中提供了高原子利用率和选择性.
  • 金属有机框架 (MOF) 为催化剂固定提供稳定,高表面积的平台.
  • MOF中的缺陷工程可以增强催化活性并创建独特的活性位点.

研究的目的:

  • 开发一种新的单原子催化剂 (SAC),集成到一个缺陷工程金属有机框架 (MOF) 中.
  • 在C-S合反应中评估开发的SAC的催化性能.
  • 用计算方法阐明反应机制.

主要方法:

  • 通过溶液浸合成单原子催化剂 (UiO-66/Ni).
  • 描述催化剂的结构和组成.
  • 在室温下测试C-S合反应中的催化活性和选择性.
  • 密度函数理论 (DFT) 计算来研究反应机制.

主要成果:

  • 在UiO-66框架内,单个原子的均分布与缺陷工程Zr-oxide集群的共价连接.
  • 异常的催化活性和选择性在C-S合的烯和烯化物,不论电子替代剂.
  • 强大的催化稳定性,在六个反应周期内保持性能.
  • DFT的计算揭示了Ni单个原子和MOF缺陷在促进CS债券形成中的协同作用.

结论:

  • 开发的UiO-66/Ni催化剂在C-S合反应中表现出卓越的性能.
  • 催化剂的稳定性和效率凸显了单原子催化剂在缺陷工程MOF中的潜力.
  • 这项工作为设计先进的混合催化系统提供了机械学的理解和途径.