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相关概念视频

Structural Isomerism02:34

Structural Isomerism

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 be...
Valence Bond Theory02:42

Valence Bond Theory

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Resonance02:52

Resonance

The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Nuclear Transmutation03:20

Nuclear Transmutation

Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...

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相关实验视频

Updated: Jun 15, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

-多重结合:具有线性U=N=U核心的同结构阳离子,中性和阴离子化复合物.

Alexander R Fox1, Polly L Arnold, Christopher C Cummins

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 6-435, Cambridge, Massachusetts 02139, USA.

Journal of the American Chemical Society
|February 25, 2010
PubMed
概括

合成了具有线性U=N=U核心的新复合物. 这种稳定的核心在多个氧化状态中被观察到,显示了它在化学中的多功能性.

科学领域:

  • 有机金属化学 有机金属化学
  • 无机化学 无机化学 有机化学
  • 化学 的化学

背景情况:

  • 复合物由于其独特的电子特性和潜在的应用而引起人们的兴趣.
  • 新型化复合物的合成和表征可以提供有关结合和反应性的见解.
  • 了解-键的稳定性对于开发新的基材料至关重要.

研究的目的:

  • 为了合成和表征新的双金属二化复合物.
  • 为了研究线性U=N=U核心在不同氧化状态的稳定性.
  • 为了探索这些化复合物的反应性.

主要方法:

  • 合成 (III) (三) 化物复合物.
  • 与亚酸盐的反应形成双金属二化复合物.
  • 使用NMR光谱,单晶X射线衍射和元素分析进行了表征.
  • 使用循环电压测量的电化学研究.

主要成果:

  • 形成双金属二 ((IV/IV) 复合物与线性,对称的桥梁化物联体.
  • 循序渐进的化学氧化成二 (IV/V) 和二 (V/V) 复合物,证明了U=N=U核心的稳定性.
  • X射线晶体结构揭示了整个氧化还原序列的收缩U=N=U核心,这归因于静电效应.

更多相关视频

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

相关实验视频

Last Updated: Jun 15, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
12:05

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

Published on: February 21, 2019

  • 循环电压测量显示可逆的一个电子的氧化还原事件.
  • ((V/V) 复合物反应形成已知的 ((IV/IV) 化物复合物,表明金属化物特性.

    • 结论:

    • 在多个氧化状态 (IV/IV,IV/V,V/V) 中,U=N=U核是稳定的.
    • 观察到的U=N=U键的收缩主要是静电的.
    • 该U=N=U核心表现出类似于金属酸的反应性.