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相关概念视频

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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相关实验视频

Updated: Jun 21, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

由电子干扰和直接的分子间相互作用控制的超分子模式.

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
概括
此摘要是机器生成的。

研究人员报告了一种新的kagome网络与p31m对称性在铜表面上的甲. 这一发现扩大了二维有机晶体中已知的对称性,由基质相互作用实现.

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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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Published on: February 15, 2016

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

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Published on: August 2, 2012

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

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 表面科学是一门学科.

背景情况:

  • 与3D空间组相比,二维 (2D) 有机晶体表现出有限的观测平面组.
  • 像p31m这样的高度对称的平面群以前没有在二维有机晶体结构中观察到.

研究的目的:

  • 报告在二维有机晶体中首次观察到一个p31m对称的kagome网络.
  • 研究在表面上自组装有机阵列中形成不寻常对称性的机制.

主要方法:

  • 在Cu{111}表面上,酸分子的自我组装.
  • 扫描道显微镜 (STM) 用于结构特征.
  • 分子对称性减少和基质介导相互作用的分析.

主要成果:

  • 一个具有p31m对称性的新型kagome网络成功合成和观察.
  • 基质诱导的分子对称性减少被确定为一个关键因素.
  • 表面电子的量子干扰介导了基质分子相互作用,影响了晶体对称性.

结论:

  • 该研究表明,基质相互作用可以控制和扩展2D有机晶体中观察到的对称性.
  • 这项工作通过控制表面相互作用,为设计具有量身定制对称性的新二维材料打开了道路.
  • 这些发现挑战了以前对有机材料中观察到的平面群对称性的限制.