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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Hydrogen Bonds01:04

Hydrogen Bonds

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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...
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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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Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Noble Gases02:54

Noble Gases

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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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圧力下でのヘリウムとフッ素の化学結合

Jingyu Hou1, Xiaojun Wang1,2, Qiang Zhu3

  • 1Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

Journal of the American Chemical Society
|July 7, 2025
PubMed
まとめ

ヘリウム化合物He3F2が 極度の圧力下で作られました この発見は,ヘリウムが化学的に惰性であるという考えに異議を唱え,予期せぬ極性共性He-F結合を明らかにした.

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科学分野:

  • 材料科学
  • 量子化学について
  • 高圧物理学

背景:

  • ヘリウムを含有する化合物は,そのユニークな構造と特性のために興味があります.
  • ヘリウムの惰性性質とエネルギーは以前ヘリウム結合の形成を防ぐことができました.

研究 の 目的:

  • 高圧下でヘリウム結合の形成の可能性を調査する.
  • 新しいヘリウム化合物の構造と結合を特徴づける.

主な方法:

  • 安定した段階を予測するための進化構造の Ab initio 検索.
  • 電子局所関数,結晶軌道ハミルトン群,電子密度トポロジック分析,バダー電荷分析を含む電子構造の計算.
  • 結合相互作用を分析するための分子軌道計算.

主要な成果:

  • 安定した化合物であるHe3F2は,多TPa圧力で発見されました.
  • He3F2は,F共有のヘリングボーンチェーンを備えています.
  • ヘリウムの1s電子は結合に参加し,極性共性He-F結合を形成し,ヘリウムの惰性に挑戦する.

結論:

  • 高圧下でのHe3F2における極性共性He-F結合の形成が実証されている.
  • この発見により 化学結合と 極限条件下でのヘリウムの反応性についての理解が 広がりました