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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.6K
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...
31.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.5K
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 the dxy,...
49.5K
Valence Bond Theory02:42

Valence Bond Theory

11.6K
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...
11.6K
Molecular Models02:00

Molecular Models

45.3K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
45.3K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
25.4K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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デシアンメタレットはモデル拡張フレームワーク

Joshua A Hill1, Amber L Thompson1, Andrew L Goodwin1

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QR, U.K.

Journal of the American Chemical Society
|April 9, 2016
PubMed
まとめ
この要約は機械生成です。

研究者は8つの新しいディシアンメタラートフレームワークを詳細に説明し,ハイブリッド無機-有機材料の洞察を提供しました. 構造の多様性は金属のノードとカチオン特性から生じ,フレームワークの探査を助けます.

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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科学分野:

  • 材料科学
  • 無機化学
  • クリスタルグラフィー

背景:

  • ディシアンメタレットは,材料科学における潜在的な応用を持つ調整ポリマーである.
  • 構造の多様性を支配する要因を理解することは,新しい材料を設計する上で極めて重要です.

研究 の 目的:

  • 8つの新しいディシアンメタラートフレームワークの構造を報告する.
  • フレームワークとフレームワーク以外のコンポーネントに基づいてディシアンメタレットの構造的多様性を合理化します.

主な方法:

  • 新しいディシアンメタラートフレームワークの構造を決定するために単一結晶X線 difraktionが使用されました.
  • 既知の構造と新しい構造を比較して,構造を導く原理を特定する.

主要な成果:

  • 分子外フレームワークカチオンを含む8つの新しいディシアンメタラートフレームワークが合成され,構造的に特徴づけられました.
  • この研究では,メタルカチオン特性 (電荷,協調性) と枠外カチオン特性 (サイズ,形状) が,枠トポロジーを制御する重要な要因として特定された.
  • これらの新しい材料は,Ruddlesden-Popperとperovskitesのような確立されたセラミック相のハイブリッド無機-有機類似体を表しています.

結論:

  • ディシアンメタレットは,多様な拡張フレームワークを作成するための汎用性のあるプラットフォームを提供します.
  • フレームワークノードとフレームワーク外ノードの相互作用が構造的結果を決定する.
  • この材料のクラスは,拡張されたフレームワークにおける構造-特性関係を研究するための優れたモデルとして機能します.