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Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Intermolecular vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak carbon–halogen...

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Published on: August 2, 2012

電子の干渉と直接の分子間相互作用によって制御される超分子パターン.

Yongfeng Wang1, Xin Ge, Carlos Manzano

  • 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, D-24098 Kiel, Germany. yfwang@physik.uni-kiel.de

Journal of the American Chemical Society
|July 15, 2009
PubMed
まとめ
この要約は機械生成です。

研究者は,銅の表面上のコバルトフタロシアニンのp31m対称性を持つ新しいカゴメネットワークを報告しています. この発見は,基板相互作用によって可能になった二次元有機結晶の既知の対称性を拡張します.

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

Published on: February 15, 2016

Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

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科学分野:

  • マテリアルサイエンス 材料科学
  • クリスタログラフィーです.
  • 表面科学とは,地表科学である.

背景:

  • 二次元 (2D) の有機結晶は,3Dの空間群と比較して,観測された平面群が限られている.
  • p31mのような非常に対称な平面群は,2Dの有機結晶構造ではこれまで観察されていなかった.

研究 の 目的:

  • 二次元有機結晶におけるp31m対称カゴメネットワークの最初の観測を報告する.
  • 表面上の自己組み立て有機配列における異常な対称性の形成の背後にあるメカニズムを調査する.

主な方法:

  • コバルトフタロシアニン分子の自己組み立ては,Cu ((111)) 表面に存在します.
  • 構造的特徴化のためのスキャニング・トンネル顕微鏡 (STM).
  • 分子対称性還元と基板媒介相互作用の分析.

主要な成果:

  • p31m対称性の新しいカゴメネットワークが成功して合成され,観察されました.
  • 基板誘発による分子対称性の減少は,重要な要因として特定されました.
  • 表面電子の量子干渉は,基板分子相互作用を媒介し,結晶対称性に影響を与えます.

結論:

  • この研究は,基板の相互作用が,2D有機結晶における観測された対称性を制御し,拡張できることを示しています.
  • この研究は,表面の相互作用を制御することによって,調整された対称性を持つ新しい2D材料を設計するための道を開きます.
  • この発見は,有機物質における観測された平面群対称性に関する以前の制限に異議を唱えている.