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相关概念视频

Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
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...
Introduction to Chemical Bonds01:01

Introduction to Chemical Bonds

Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

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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相关实验视频

Updated: Jun 6, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

在键之间混合价值.

John C Goeltz1, Clifford P Kubiak

  • 1Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive, M/C 0358, La Jolla, California 92093-0358, USA.

Journal of the American Chemical Society
|November 20, 2010
PubMed
概括
此摘要是机器生成的。

一个减少的团形成了一个由键和混合价值稳定的二元体. 这种通过光谱学观察到的电子效应显著降低了该综合体的基本状态能量.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

相关实验视频

Last Updated: Jun 6, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

科学领域:

  • 无机化学 无机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学方法.

背景情况:

  • 氧中心的三团是多功能协调化合物.
  • 混合价值复合体表现出独特的电子特性.
  • 键在分子组合和稳定中起着至关重要的作用.

研究的目的:

  • 为了研究一个特定的三集群在减少后的二分化.
  • 为了描述产生的二次体的电子结构和稳定性.
  • 阐明混合价值,键和电子合之间的相互作用.

主要方法:

  • 合成和部分减少一个以氧为中心的三烯集群与化-4-碳素酸连接体.
  • 红外 (IR) 光谱检测探测电荷定位.
  • 紫外/紫外/红外光谱法用于确定电子稳定能.

主要成果:

  • 在部分减少后形成混合价值单二氧化酸二聚体.
  • 在二甲基硫氧化物 (DMSO) 或脱碳酸盐中没有观察到二度化.
  • 光谱数据显示电荷定位和显著的基态稳定 (大约. 7 kcal/mol) 由于跨键的混合价值.

结论:

  • 混合价值二次体是一种电荷局部化的物种.
  • 相当大的稳定能量来自键和电子合的协同效应.
  • 这项研究强调了联体选择和质子化状态在控制集群组装和电子性质方面的重要性.