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相关概念视频

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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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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Covalent Bonding and Lewis Structures

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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Properties of Organometallic Compounds

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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.
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相关实验视频

Updated: Jun 18, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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在金属有机框架内构建Co4(SO4) 4集群,以实现高效的氧气电催化.

Zuozhong Liang1, Guojun Zhou1, Huang Tan2

  • 1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China.

Advanced materials (Deerfield Beach, Fla.)
|August 3, 2024
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概括

研究人员在金属有机框架 (MOF) 中合成了新的硫酸盐集群,以实现高效的氧气电催化. 这些Co4(SO4) 4集群在氧化演化 (OER) 和氧减少 (ORR) 反应中都表现出显著的活性.

关键词:
Co4 (((SO4) 4 的集群.金属的氨酸是金属的氨酸.金属有机框架氧气进化反应反应 氧气进化反应氧降解反应是氧降解反应.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 多核金属集群是多电子转移反应的有希望的催化剂.
  • 合成活性金属集群用于催化仍然是一个重大挑战.
  • 金属有机框架 (MOF) 为构建先进的催化材料提供了多功能平台.

研究的目的:

  • 在基于氨酸的MOF中构建一个前所未有的Co4(SO4) 4集群.
  • 为了研究这些Co4(SO4)4集群的氧化演化反应 (OER) 和氧减少反应 (ORR) 的电催化性能.
  • 阐明CO4~SO4集群的作用和原子在氧气电催化中的协同效应.

主要方法:

  • 使用CoII硫酸盐和金属氨酸前体进行Co4-M-MOFs (M = Co,Cu,Zn) 的溶热合成.
  • 结晶学研究以确定框架结构和集群协调.
  • 电催化测量 (OER和ORR) 用于评估催化活性.
  • 理论计算以了解反应机制和协同效应.

主要成果:

  • 成功合成了具有统一框架结构的Co4-M-MOFs,其中包括由金属氨酸单元连接的Co4(SO4)4集群.
  • 所有合成的Co4-M-MOF都表现出OER和ORR的电催化活性.
  • Co4-Co-MOF表现出卓越的性能,在357 mV超电位下达到10 mA cm-2 OER电流密度,ORR半波电位为0.83 V与RHE.
  • 理论研究揭示了Co4(SO4)4集群中近邻原子之间的协同效应,在OER.期间促进O-O键的形成.

结论:

  • 在MOF框架内建造CO4~SO4) 4集群是开发高效氧气电催化剂的可行策略.
  • Co4 (((SO4) 4集群本身就是氧气电催化作用的活性场所.
  • 集群中的原子之间的协同相互作用在增强OER活动中起着至关重要的作用.