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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.8K
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...
30.8K
Bonding in Metals02:32

Bonding in Metals

52.2K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.4K
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,...
48.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.9K
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...
16.9K
Metallic Solids02:37

Metallic Solids

20.5K
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....
20.5K
Alkali Metals03:06

Alkali Metals

24.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.3K

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関連する実験動画

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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シングル・クリスタル・オープン・カプセル・メタル・オーガニック・フレーム

Yong-Sheng Wei1, Mei Zhang1, Mitsunori Kitta2

  • 1AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST) , Sakyo-ku, Kyoto 606-8501 , Japan.

Journal of the American Chemical Society
|May 3, 2019
PubMed
まとめ

研究者らは新型の単結晶金属有機フレームワーク (MOF) カプセルを開発し,その開口部で充電が強化されました. このカプセル型MOFは,水分裂とZn-空気電池の効率的な多機能電解を可能にします.

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 電気化学

背景:

  • マイクロ/ナノカプセルは 薬の貯蔵,触媒,投与に不可欠です
  • 従来のカプセルには,非/多結晶の壁があるため,負荷と拡散の制限があります.

研究 の 目的:

  • 固有の開口を持つ新しい単結晶カプセル金属有機フレームワーク (MOF) を設計し合成する.
  • 先進的な電気触媒のためのカプセルMOFから窒素ドープされた炭素ベースのフレームワークを製造する.

主な方法:

  • 単結晶カプセルMOFを作成するための結晶構造変換.
  • カプスラーMOFとメラミンの溶解-リン酸化により, Fe-Niリン酸化ナノ粒子と炭素ナノチューブを埋め込んだ窒素ドープされた炭素枠を形成する.

主要な成果:

  • オープンカプセルMOFは,既存のMOFと比較して,硫黄とヨウ素に対する優れた負荷能力を示した.
  • 導出された窒素ドーピングされたカプセル型炭素フレームワークは,酸素の進化,水素の進化,そして酸素の減少のための効率的な多機能電解を示した.

結論:

  • 新しいカプセルMOFの設計は,従来のマイクロ/ナノカプセルの拡散制限を克服します.
  • 製造された窒素ドーピングされた炭素ベースの材料は,全体的な水分裂と充電可能なZn-空気電池のための重要な可能性を示している.