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Metallic Solids02:37

Metallic Solids

20.8K
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....
20.8K
Bonding in Metals02:32

Bonding in Metals

52.6K
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”. 
52.6K
Properties of Transition Metals02:58

Properties of Transition Metals

30.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.0K
Valence Bond Theory02:42

Valence Bond Theory

11.3K
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...
11.3K
Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Formal Charges02:42

Formal Charges

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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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混合バレンスの金属-有機フレームワークにおける電荷移転と大量電子伝導性 Fe ((1,2,3-トリアゾラート) 2 ((BF4) x

Jesse G Park1, Michael L Aubrey1, Julia Oktawiec1

  • 1Department of Chemistry , University of California , Berkeley , California 94720 , United States.

Journal of the American Chemical Society
|June 13, 2018
PubMed
まとめ
この要約は機械生成です。

導電性が著しく向上した新しい混合バレンスの金属有機フレームワーク (MOF) を開発しました. これらの鉄基のMOFは伝導性が最大8度まで増加し,先進的な電子アプリケーションの道を開いています.

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科学分野:

  • 材料科学
  • 電気化学
  • 固体化学

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,電気化学および電子アプリケーションに希望を示しています.
  • MOFの電荷輸送を理解することは,その伝導性を改善するために不可欠です.
  • MOFの料金輸送メカニズムに関する現在の知識は限られている.

研究 の 目的:

  • 混合バレンスの鉄・トリアゾラートMOFを合成し,特徴づけること.
  • 鉄の酸化状態と電気伝導性の関係を調べる
  • これらの材料の電荷輸送メカニズムを明らかにする.

主な方法:

  • 鉄 (II) トリアゾラートMOF (Fe) のステイキオメトリック化学酸化により,混合値Fe (tri) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub) (sub)
  • 粉末X線 difraktion,Mössbauer光譜,および材料の特徴化のためのIR/UV対NIR拡散反射光譜.
  • 室温での電気伝導度測定

主要な成果:

  • 混合バレンスのFe (tri) 2 (BF4) x (x = 0.09, 0.22, 0.33) を成功裏に分離した.
  • 電気伝導性は,鉄酸化レベルによって劇的に増加し,Fe (tri) 2 (BF4) 0.33 (8度の増加) に達した.
  • 混合バレンスのFeII/IIIセンター間の間隔電荷伝送に起因する高伝導度,光譜で確認された.

結論:

  • 混合バレンスのMOFは,その原材料と比較して,電気伝導性が著しく向上しています.
  • チャージ輸送メカニズムは,間隔チャージ転送によって支配されています.
  • これらの発見は,電子アプリケーションのための高伝導性MOFの設計のための新しい経路を提供します.