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Electron Configurations02:46

Electron Configurations

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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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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 - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Metallic Solids02:37

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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.
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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.
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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在 [4Fe-4S] 集群中插入三坐标.

Majed S Fataftah1, Daniel W N Wilson1, Zachary Mathe2

  • 1Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.

ACS central science
|October 28, 2024
PubMed
概括
此摘要是机器生成的。

研究人员展示了电子转移如何组装复杂的-铁-硫化物集群,模仿一氧化碳脱酶 (CODH) 的活性位点. 这揭示了形成 [1Ni-4Fe-4S] 和 [2Ni-3Fe-4S] 星团的新途径,突出了这些系统中Ni1+的生存能力.

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科学领域:

  • 生物有机化学 生物有机化学
  • 金属酶活性部位的合成.
  • - 铁 - 硫集群组件组件

背景情况:

  • 金属酶在温和条件下催化关键的氧化还原反应,包括CO2/CO相互转换.
  • 厌氧一氧化碳脱酶 (CODH) 使用一个独特的[NiFe3S4]-Feu集群,具有三坐标位.
  • 对于CODH C集群的自然组装机制,人们对其了解甚少.

研究的目的:

  • 调查与CODH C集群相关的-铁-硫集群的组装.
  • 探索电子转移在推动复杂金属酶活性位形成中的作用.
  • 为了证明Ni1+在铁硫集群环境中的可行性.

主要方法:

  • 使用Ni0前体和[Fe4S4]3+集群合成新的-铁-硫集群.
  • 通过磁力测量,电子磁共振 (EPR),Mössbauer和X射线吸收光谱学进行表征.
  • 使用密度函数理论 (DFT) 计算进行理论验证.

主要成果:

  • 电子转移驱动Ni0插入[Fe4S4]3+,形成一个 [1Ni-4Fe-4S]集群与外部Ni1+.
  • 对Ni0前体的修改导致了两个Ni原子的插入和一个Fe的弹出,形成了前所未有的 [2Ni-3Fe-4S] 集群.
  • 两种合成集群均具有三坐标金属位点和Ni在+1氧化状态,通过光谱和DFT确认.

结论:

  • 氧化驱动的转化可以组装复杂的,核度更高的-铁-硫集群.
  • 1+是铁硫集群框架内稳定且可行的氧化状态.
  • 这些发现为CODH C集群活跃站点的潜在组装路径提供了洞察力.