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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

10.2K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
10.2K
Valence Bond Theory02:42

Valence Bond Theory

9.8K
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...
9.8K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

50.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
50.5K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
15.5K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

35.0K
sp3d and sp3d 2 Hybridization
35.0K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

6.0K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
6.0K

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Updated: Oct 9, 2025

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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ハニコム・レーツシステムにおけるカチオン・ダイメリゼーション

Hajime Yamamoto1, Sachiko Kamiyama1, Ikuya Yamada2

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.

Journal of the American Chemical Society
|December 17, 2021
PubMed
まとめ

3d^1のハネコブ格子系であるMgVO3では,研究者は500K未満のV-V二分化を観察し,磁性から非磁性への移行に至った. この研究は,このような低次元のシステムにおける ヴァレンスの電子の振る舞いを明らかにします.

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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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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 固体化学

背景:

  • 低次元のシステムにおける電子状態と結晶構造の同時に変化を伴う.
  • カチオン二分化,ピエルス移行の形態は,VO2ではよく記録されているが,3d ^ 1ハネコブ格子系では稀である.
  • ハニコム格子には,固有の低次元性があるため,ピエルス不安定性がある.

研究 の 目的:

  • イルメニット型MgVO3のV-V二酸化を調査するために,3d ^ 1の蜂巣格子システム.
  • この特定の低次元の材料における ヴァレンスの電子の振る舞いを理解するために
  • ダイメリゼーションに伴う磁気と電子の相変化の可能性を調査する.

主な方法:

  • 構造の変化を観察するためにシンクロトロンX線実験が実施された.
  • 段階転換を特定するために,温度に依存する測定が行われました.
  • 分析は,V-V直接結合と関連する電子性質の形成に焦点を当てた.

主要な成果:

  • MgVO3の500K以下では,V-Vダイマーの梯子状のパターンが観察された.
  • 観測された二極化は,磁気状態から非磁気状態への移行に伴いました.
  • 証拠によると,バレンスの結合液相は500Kから600Kの間に存在している可能性がある.

結論:

  • この研究では,3d^1ハネコブ格子系 (MgVO3) でV-V二分化が成功していることが示された.
  • この発見は,構造的二極化に関連した磁性から非磁性への移行を強調しています.
  • この研究は,低次元の材料におけるバレンスの電子の複雑な電子的振る舞いについての洞察を提供します.