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相关概念视频

Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries
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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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相关实验视频

Updated: May 7, 2026

Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
10:54

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Published on: February 4, 2017

β-Technetium二化物:固态调制结构,电子结构和物理特性.

Christos D Malliakas1, Frederic Poineau, Erik V Johnstone

  • 1Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|September 24, 2013
PubMed
概括
此摘要是机器生成的。

一种新的二化技多态,β-TcCl2,被合成和特征. 这种p型半导体表现出独特的链结构和二磁性质,具有0.12 eV的确定带间隙.

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Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
10:54

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Published on: February 4, 2017

Investigations on the Ga(III) Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue
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科学领域:

  • 固态化学 固态化学
  • 无机材料科学 是一种无机材料科学.
  • 材料的表征材料的表征.

背景情况:

  • 技术二化物 (TcCl2) 存在于多种形式,影响其性能.
  • 了解多态对于材料的开发和应用至关重要.

研究的目的:

  • 合成和表征一种新的二二技术的多态,β-TcCl2.
  • 研究β-TcCl2的晶体结构和物理特性.
  • 使用理论计算探索TcCl2的潜在稳定形式.

主要方法:

  • 在密封管中,通过Tc金属和在450°C的反应合成β-TcCl2.
  • 结晶学结构的确定.
  • 物理属性测量包括电阻,西贝克效应,磁感应和反射光谱.
  • 密度函数理论 (DFT) 的计算.

主要成果:

  • 成功合成了一种新的二化技多态,β-TcCl2.2.
  • 将晶体结构解为具有有序TcTc向量的面部共享[Tc2Cl8]单位的无限链.
  • β-TcCl2被确定为p型半导体,带间距为0.12(2) eV.
  • 对磁感应度的测量表明了二磁性行为.

结论:

  • 新的β-TcCl2多态体具有独特的调制结构.
  • β-TcCl2具有与电子应用相关的半导体特性.
  • 理论计算提供了对其他潜在稳定的TcCl2形式的洞察力.