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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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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...
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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...
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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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在3d蜂格子系统中的阴离子二元化

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
概括

在MgVO3中,研究人员观察到500K以下的V-V二元化,导致磁性到非磁性的过渡. 这项研究揭示了这种低维系统中的价值电子行为.

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科学领域:

  • 材料科学
  • 凝聚物质物理学
  • 固态化学

背景情况:

  • 皮尔斯转换涉及低维系统中的电子状态和晶体结构的同时变化.
  • 皮埃尔斯过渡的一种形式,在VO2中得到了很好的记录,但在3d^1蜂晶格系统中却很少见.
  • 蜂格子由于其固有的低维度,容易受到皮尔斯的不稳定性.

研究的目的:

  • 为了研究V-V二元化在伊尔梅尼特型MgVO3,一个3d^1蜂晶格系统.
  • 了解这种特定的低维材料中的价值电子的行为.
  • 探索与二元化相关的潜在磁性和电子相位过渡.

主要方法:

  • 使用同步射线实验观察结构变化.
  • 进行了温度依赖的测量以确定相位过渡.
  • 分析的重点是V-V直接键的形成和相关的电子特性.

主要成果:

  • 在MgVO3中观察到500K以下的V-V二分体的梯形模式.
  • 观察到的二极化伴随着从磁性到非磁性状态的过渡.
  • 证据表明可能存在于500K和600K之间的价值键液相.

结论:

  • 该研究成功地在3d^1蜂格子系统 (MgVO3) 中证明了V-V二分化.
  • 这些发现突出了与结构二极化相关的磁性到非磁性过渡.
  • 这项研究提供了关于低维材料中价值电子的复杂电子行为的见解.