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関連する概念動画

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
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...
47.5K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.6K
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.
15.6K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
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...
28.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.0K
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...
18.0K
Metallic Solids02:37

Metallic Solids

16.4K
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...
16.4K

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関連する実験動画

Updated: May 3, 2026

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
12:39

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

Published on: January 15, 2012

25.4K

ドデカエドール型金のナノ結晶: 失われたプラトンの形状

Wenxin Niu1, Weiqing Zhang, Shaik Firdoz

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, Singapore 117585.

Journal of the American Chemical Society
|February 18, 2014
PubMed
まとめ

研究者は,新しい種子媒介アプローチを使用して,プラトニックの十二面金ナノ結晶 (Au NCs) を合成しました. このブレークスルーにより,難解な十二面体形の作成が可能になり,ナノマテリアルの応用の可能性が広がります.

科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 化学 化学は化学です.

背景:

  • プラトニック貴金属ナノ結晶 (NCs) は,対称性および触媒,プラズモニクス,センシング,およびスペクトロスコピーの応用で評価されています.
  • 四面体,立方体,八面体,および二面体NCの合成が確立されていますが,十二面体形状は依然として困難です.

研究 の 目的:

  • プラトニックの十二面形の貴金属NCsの結晶構造を提案する.
  • 十二面金 (Au) NCs.を生産するための合成方法を開発する.
  • イコサヘドラル (Ih) シンメトリーを持つAu NCの形状制御を調査する.

主な方法:

  • オーダーメイドの種子媒介の合成アプローチが採用されました.
  • イコサヘドール状の多重双子のAu種は,出発点として使用されました.
  • {111} 面と {110} 面の比率を体系的に調整した.

主要な成果:

  • プラトニックの十二面体Au NCは,二面体Auの種から成功裏に育てられました.
  • イコサエドール形,イコシドデカエドール形,そしてドデカエドール形を持つNCsが得られました.
  • イコサヘドラル (Ih) シンメトリーを示すAu NCのファミリーが実証されました.

さらに関連する動画

Synthesis and Characterization of Amphiphilic Gold Nanoparticles
10:09

Synthesis and Characterization of Amphiphilic Gold Nanoparticles

Published on: July 2, 2019

17.3K
A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
08:21

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Published on: February 5, 2016

23.2K

関連する実験動画

Last Updated: May 3, 2026

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
12:39

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method

Published on: January 15, 2012

25.4K
Synthesis and Characterization of Amphiphilic Gold Nanoparticles
10:09

Synthesis and Characterization of Amphiphilic Gold Nanoparticles

Published on: July 2, 2019

17.3K
A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
08:21

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Published on: February 5, 2016

23.2K

結論:

  • ドデカエドール型NCの提案された結晶構造は,合成によって検証されています.
  • 種子によるアプローチは,NCの形状と対称性に対する制御を提供します.
  • この研究は,特定のプラトンの幾何学を持つ高貴金属NCを設計するための新しい道を開きます.