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関連する概念動画

MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

14.5K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

31.9K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
31.9K
Polar Covalent Bonds02:24

Polar Covalent Bonds

31.0K
Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
31.0K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K
Valence Bond Theory02:45

Valence Bond Theory

50.9K
Overview of Valence Bond Theory
50.9K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.6K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.6K

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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アンチパラレルダイナミック・コバルント・ケミストリー

Bartosz M Matysiak1,2, Piotr Nowak1, Ivica Cvrtila1

  • 1Centre for Systems Chemistry, Stratingh Institute, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Journal of the American Chemical Society
|April 26, 2017
PubMed
まとめ
この要約は機械生成です。

複雑な化学システムを 制御できるようにする このアプローチは,ダイナミックな制御のために,可逆のチオール-二硫化物交換とチオ-マイケルの添加反応を使用します.

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Covalent Fragment Screening Using the Quantitative Irreversible Tethering Assay
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関連する実験動画

Last Updated: Mar 3, 2026

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Covalent Labeling with Diethylpyrocarbonate for Studying Protein Higher-Order Structure by Mass Spectrometry
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科学分野:

  • 化学システム
  • 超分子化学
  • 有機化学

背景:

  • 複雑な機能化学システムを設計するには 制御可能な反応ネットワークが必要です
  • ダイナミック・コンビネトリアル・ケミストリーは複雑だが 精密な制御は欠けている.
  • 先進的なシステム化学では 複雑性を生み出す方法と対処方法が求められます

研究 の 目的:

  • 化学システムにおける制御可能な複雑性のための反並列化学を導入する.
  • チオール-二硫化物交換とチオ-マイケルの添加を切り替えるシステムを実証する.
  • 先進的な機能化学システムを開発するための多角的なプラットフォームを提供します.

主な方法:

  • 使用された反パラレル化学:チオール-二硫化物交換とチオ・マイケル添加.
  • 両方の可逆化学反応に共通するチオルの構成要素を使用した.
  • 酸化と還元パラメータを介してシステムの状態を制御します.

主要な成果:

  • チオマイケルの添加と二硫化物の形成の間の可逆的な切り替えを達成した.
  • レドックス・ポテンシャルによる各化学物質の度合いの制御を証明した.
  • 室温と穏やかなpHの水性環境でのシステムの動作を示した.

結論:

  • アドレス可能な複雑な化学システムを設計するための新しい戦略を提供します.
  • チオールベースのシステムは,システム化学の開発のための堅固なプラットフォームを提供します.
  • このアプローチは,動的機能的材料と分子装置の作成を容易にする.