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Valence Bond Theory02:42

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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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Overview of Valence Bond Theory
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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难以捉摸的三坐标的二定性化复合体.

Wen-Ching Chen1, Ching-Yu Lee, Bo-Chao Lin

  • 1Institute of Chemistry, Academia Sinica , Nangang, Taipei, Taiwan, Republic of China.

Journal of the American Chemical Society
|January 4, 2014
PubMed
概括
此摘要是机器生成的。

研究人员发现了一种新型的三坐标二离子基酸复合体. 这种与BH3的前所未有的反应是使用碳二碳联体实现的,避免了强烈的易斯酸.

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科学领域:

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

背景情况:

  • 化物 (BH3) 通常是反应性的,需要稳定.
  • 三坐标复合物不太常见,尤其是阴离子物种.
  • 碳二碳联体为稳定活性物种提供独特的电子特性.

研究的目的:

  • 为了描述一种新型的三坐标的二化酸复合物的形成.
  • 为了研究BH3与碳酸二碳联体的反应性.
  • 为了阐明新形成的复合物的电子结构.

主要方法:

  • 使用碳化碳和BH3.3合成复合物.
  • 用光谱分析 (例如NMR) 来描述产品的特征.
  • 进行X射线晶体学以确定分子结构.
  • 计算化学 (例如,DFT) 用于分析电子属性.

主要成果:

  • 形成一个以前未知的三坐标的二化酸复合体.
  • 在没有强烈的易斯酸的情况下,BH3和碳酸之间发生了前所未有的反应.
  • 综合体电子和结构特征的详细描述.

结论:

  • 碳二碳联体可以促进与BH3的异常反应性.
  • 发现的复合物代表了一类新的化合物.
  • 了解其电子特征,可以了解化学.