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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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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
Structural Isomerism02:34

Structural Isomerism

22.4K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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コバルト (III) -トリアゾラート/ピラゾラート金属有機フレームワークで選択的に調節可能なO2結合

Dianne J Xiao, Miguel I Gonzalez, Lucy E Darago

  • 1Department of Chemistry, and Supercomputing Institute, University of Minnesota , Minneapolis, Minnesota 55455, United States.

Journal of the American Chemical Society
|May 17, 2016
PubMed
まとめ

新しい金属有機フレームワークは,空気分離に不可欠な窒素に対する酸素吸収の高い選択性を示しています. これらの材料は調節可能な O2 の親和性と可逆性があり,産業用途に有望です.

さらに関連する動画

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
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科学分野:

  • 材料科学
  • 無機化学
  • 化学工学

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,調節可能な性質を持つ多孔性材料です.
  • 効率的なガス分離は,特に空気から酸素は,産業プロセスにとって非常に重要です.
  • コバルト基のMOFは,コバルトの酸化還元活性による選択的ガス吸着のために調査されています.

研究 の 目的:

  • 選択的な酸素吸収のための新しいコバルトベースの金属有機フレームワークを合成し,特徴づけること.
  • これらの材料のO2とN2吸収特性と結合親和性を調査する.
  • O2の選択性と吸収強度に影響を与える構造的および電子的要因を探求する.

主な方法:

  • ソダライト型コバルト有機フレームワーク (Co-BTTriとCo-BDTriP) の溶熱合成
  • ガス吸着イソテルム (O2,N2) とイソステリック熱計算 (Qst)
  • シングルクリスタルX線 difraktion,磁気感受性測定,および電子構造計算.

主要な成果:

  • Co-BTTriとCo-BDTriPのフレームワークは,N2よりも選択的なO2吸収を示しています.
  • 溶解したコバルト (II) センターは強いO2結合を示している (Qst = -34 ((1) kJ/molのCo-BTTri).
  • 同構造のCo-BDTriPは,コバルト (III) -スーパーオクソ種を形成する電子ドナーリンカーにより,強化されたO2親和性 (Qst = -47 kJ/mol) を示す.

結論:

  • 合成されたMOFは,優れたO2選択性と可逆性アドソープション能力を示しています.
  • 構造と電子の改変により,O2の結合強度が最適化されます.
  • これらの材料は,空気分離アプリケーションの吸着剤として重要な可能性を秘めています.