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相关概念视频

Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Valence Bond Theory02:42

Valence Bond Theory

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...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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相关实验视频

Updated: Jul 13, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
10:42

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Published on: December 29, 2016

在NaSbO3中的多态性:在金属氧化物中的结构和结合.

Hiroshi Mizoguchi1, Patrick M Woodward, Song-Ho Byeon

  • 1Department of Chemistry, Ohio State University, Columbus, Ohio 43210-1185, USA.

Journal of the American Chemical Society
|March 12, 2004
PubMed
概括
此摘要是机器生成的。

在高压下合成了一种具有矿结构的新型抗原 (NaSbO(3)) 多态. 这一发现揭示了三元抗化合物中复杂的结合和结构偏好.

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Published on: December 29, 2016

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科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 三级矿在材料科学中至关重要,但它们的结构多样性和压力下的稳定性尚未完全理解.
  • 已知抗蒙酸 (NaSbO(3) 在环境条件下存在于一个ilmenite多态体中.

研究的目的:

  • 合成和表征一种新的NaSbO高压多态体.
  • 研究这种新型材料的结构,电子和粘合性能.
  • 了解不同NaSbO(3) 多态的稳定性的因素.

主要方法:

  • 使用单轴分裂球形形压力机 (USSA-2000) 在10.5 GPa和1150°C的高压合成.
  • 用X射线衍射来确定晶体结构.
  • 光学测量以确定带间隙.

主要成果:

  • 一种新型的NaSbO(3) 的矿多态形态被成功合成并恢复到环境条件下.
  • 该结构 (空间组 Pnma) 呈现出显著的八面体倾斜扭曲,比离子半径预测的要大.
  • 该化合物是一个白色绝缘体,光带间隙为3.4 eV,代表第一个三元矿与Sb ((5+) 在八面体位点.

结论:

  • 观察到的扭曲归因于对氧的二次恩-泰勒效应,由强大的Sb-O共价键驱动.
  • 在环境条件下,Sb-O共价键和Na-O排斥相互作用之间的冲突使矿结构不稳定,有利于矿多态.
  • 对结合的分析解释了ASbO(3) 和ABiO(3) 化合物中违反保林规则的结构的普遍性.