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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

10.9K
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...
10.9K
Valence Bond Theory02:45

Valence Bond Theory

48.9K
Overview of Valence Bond Theory
48.9K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

1.4K
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...
1.4K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.5K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.5K
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

5.2K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
5.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.7K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.7K

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Updated: Dec 25, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

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ユニバーサル A-カチオン分裂 LiNbO3型構造 イントラポジショナルの多価結合によって駆動

Yifeng Han1, Yijie Zeng2, Mylène Hendrickx3

  • 1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.

Journal of the American Chemical Society
|March 29, 2020
PubMed
まとめ
この要約は機械生成です。

LiNbO3型の極磁石で Znイオン分裂を発見し 多鉄質の物質で普遍的な原子分裂を明らかにしました この分裂は磁気相互作用とカチオン結合によって影響され,フェロ電気機構の洞察を提供します.

さらに関連する動画

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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関連する実験動画

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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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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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科学分野:

  • 材料科学
  • 固体物理学
  • クリスタルグラフィー

背景:

  • マルチフェロ材料におけるフェロ電気メカニズムを理解することは,電気二極交互に不可欠です.
  • 高圧で準備されたLiNbO3タイプの極磁石における原子スケールの局所構造の進化は不明である.
  • これらの材料における鉄電機構の確固たる実験指標は欠けています.

研究 の 目的:

  • LiNbO3型の極磁石における原子スケールの局所構造の進化を調査する.
  • 鉄電機の実験指標を発見する.
  • Zn2FeNbO6における Znイオン分裂の役割を理解する.

主な方法:

  • 粉末X線光による構造的改良を含む複数の光技術.
  • 高角環状ダークフィールドスキャニング伝送電子顕微鏡 (HAADF-STEM).
  • 理論的な計算だ

主要な成果:

  • LiNbO3型Zn2FeNbO6におけるZnイオン分裂の発見
  • 混合Zn2FeTaO6とZnTaO2NにおけるA地点原子分裂の検証,ZnSnO3には含まれていない.
  • Mn-アナログにおけるA位分裂の理論的確認,磁気相互作用によるより小さな分裂.

結論:

  • 混合カチオンまたはアニオンサイトを持つLiNbO3型構造に普遍的なAサイト分裂が存在する.
  • 原子分裂/移動は磁気相互作用とバレンスの帯の混合によって抑制されます.
  • 発見は,鉄電機と材料の設計に関する洞察を提供します.