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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.3K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

35.7K
Bond Polarity
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Types of Chemical Bonds02:37

Types of Chemical Bonds

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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Updated: Feb 9, 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

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可視光吸収時に結合を形成するテルイオン複合体

Sara A M Wehlin1, Ludovic Troian-Gautier1, Renato N Sampaio1

  • 1Department of Chemistry , University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States.

Journal of the American Chemical Society
|June 14, 2018
PubMed
まとめ
この要約は機械生成です。

ルテニウム (II) 複合体と2つのヨウ素イオンを含む新しいテリオン複合体は,可視光にさらされたときに共性ヨウ素-ヨウ素結合を形成する. この発見は太陽光燃料の生産技術の進歩に 関連しています

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関連する実験動画

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科学分野:

  • 写真化学
  • 超分子化学
  • 無機化学

背景:

  • ルテニウム (II) 複合体は,その光化学的性質で知られている.
  • ヨウ素イオンは酸化還元反応に参加し,興奮状態のダイナミクスに影響を与える.
  • 光誘発結合の形成を理解することは,エネルギーアプリケーションにとって極めて重要です.

研究 の 目的:

  • 可視光刺激によるテリオン複合体における共性I-I結合の形成を調査する.
  • この光誘発反応のメカニズムを解明する.
  • このプロセスの太陽光燃料生産の重要性を評価する.

主な方法:

  • アセトンの溶液でテトラケチオン Ru (II) コンプレックスと2つのヨウ素イオンを使用した.
  • 1H NMR,可視吸収光譜,および密度関数理論 (DFT) の研究を使用した.
  • 興奮状態の相互作用を分析するために,スターン-ヴォルマー quenching 実験を行いました.

主要な成果:

  • 可視光刺激で共性I−I結合が観察された.
  • 放射光学とDFTの研究では,Ru中心に対する2つのヨウ素イオンの異なる位置を示した.
  • スターン・ヴォルマー quenchingは,多段階メカニズムと一致する,上向きの曲線と飽和を示した.
  • ヨウ素原子の中間物質が形成され,リガンド関連ヨウ素と急速に反応し,70nS以内でI2•- を生成した.

結論:

  • テリオン複合体は,ルイ媒介の電子移転と,その後のヨウ素原子反応により,急速なI−I結合形成を促進する.
  • 反応イオンの超分子組成は この効率的な三イオン反応の鍵です
  • 発見は太陽光燃料の生産に関連する光駆動プロセスの洞察を提供します.