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関連する概念動画

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

960
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
960
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
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.5K
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...
25.5K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.5K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.7K
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...
31.7K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

2.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.0K

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関連する実験動画

Updated: Mar 26, 2026

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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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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メタル・オーガニック・フレームに組み込むことにより,パラジウムピンカー複合体の触媒活動と安定性を改善

Samantha A Burgess1, Abebu Kassie1, Sarah A Baranowski1

  • 1Department of Chemistry, Brandeis University , 415 South Street MS 015, Waltham, Massachusetts 02453, United States.

Journal of the American Chemical Society
|January 28, 2016
PubMed
まとめ

パラジアム・ディフォスフィニット・ピンチャー・コンプレックスを含む新型の多孔金属有機構造が合成された. このフレームワークは,同質の同位体よりも優れた,活性で再利用可能な転移水素化の触媒として機能します.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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関連する実験動画

Last Updated: Mar 26, 2026

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
07:14

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

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科学分野:

  • 材料科学
  • カタリシス
  • 協調化学

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,触媒用途の調整可能な多孔構造を提供します.
  • パラジウムピンチャー複合体は効果的な触媒であるが,均質なシステムでは不安定である.

研究 の 目的:

  • パラジアム・ディホスフィニット・ピンチャー・コンプレクスを組み込んだ 新種の多孔金属・有機構造を 構築する
  • 移転用水素化のための固定複合体の触媒活性と再利用性を評価する.
  • 固定した触媒の性能を同質なアナログと比較する.

主な方法:

  • Pdディフォスフィニットピンチャー複合体を使用して,多孔金属有機フレームワーク (MOF) Zr6O4(OH) 4(L-PdX) 3の合成.
  • 活性触媒種 (1-TFA) を生成するためのリガンド交換反応.
  • 甲酸を水素源として使用したベンザルデヒドの触媒移転水素化.

主要な成果:

  • 合成されたMOF (1-TFA) は,転送水素化の触媒として高い活性と再利用性を示した.
  • 同質のアナログである (t) Bu ((L-PdTFA) は,分解により劣った触媒性能を示した.
  • MOF構造内のパラジウム複合体の不動化は,その安定性と触媒効率を高めました.

結論:

  • 毛細な金属有機構造は,パラジウム触媒による転送水素化のための安定した効果的なプラットフォームを提供します.
  • MOFの不動化は,同質な触媒の性能と長寿を改善するための有益な戦略です.
  • この研究は,持続可能な化学合成におけるMOFが支援する触媒の可能性を強調しています.