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相关概念视频

Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
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
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Halogenation of Alkenes02:46

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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相关实验视频

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
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Published on: December 29, 2016

二二:一种新的二元化物,含有金属金属多重键.

Frederic Poineau1, Christos D Malliakas, Philippe F Weck

  • 1Department of Chemistry, University of Nevada-Las Vegas, Las Vegas, Nevada 89154, USA. poineauf@unlv.nevada.edu

Journal of the American Chemical Society
|May 18, 2011
PubMed
概括

研究人员发现了二二,揭示了具有TcTc三重键的新型结构. 这一发现通过X射线衍射和计算得到证实,进步了无机化学和材料科学.

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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
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The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique
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科学领域:

  • 无机化学 无机化学
  • 固态化学 固态化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 由于其放射性,技术化学的探索较少.
  • 了解化可以揭示独特的结合和结构图案.

研究的目的:

  • 合成和描述一种新型的二二化合物.
  • 为了阐明二二中固态结构和金属对金属的结合.

主要方法:

  • 从元素技术和合成.
  • 使用单晶X射线衍射进行表征.
  • 电子结构计算.

主要成果:

  • 技术二二的成功合成和结构确定.
  • 发现了一种新的结构类型,具有无限链的面部共享 [Tc(2) Cl(8) ] 矩形镜.
  • 观察一个短的Tc-Tc距离 (2.127(2) Å),表明三重键.
  • 对TcTc三重债券的计算支持.

结论:

  • 二二技术代表了无机化学中的新结构类.
  • TcTc三重键是重过渡金属化学中的一个重要发现.
  • 这项工作为探索其他化和相关化合物开辟了道路.