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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

11.8K
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...
11.8K
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

7.6K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
7.6K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

482
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
482
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.9K
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...
20.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.7K
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...
26.7K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.0K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.0K

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関連する実験動画

Updated: Jul 17, 2025

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

9.6K

構成的にダイナミックな銅の協調複合体における急速な電子移転自己交換

Paul J Griffin1, Lisa Olshansky1

  • 1Department of Chemistry, Center for Biophysics and Quantitative Biology, and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|September 8, 2023
PubMed
まとめ

ダイナミックな銅複合体と dpa リガンドは 極めて高速な電子移転率を示しています 青銅のタンパク質の硬さとは異なり この形状の柔軟性は 効率的な電子移転の鍵です

科学分野:

  • 無機化学
  • バイオ有機化学
  • 物理化学

背景:

  • 電子伝達 (ET) は,生物学的および化学的なシステムにおいて根本的なものです.
  • 銅複合体は重要な触媒であり,電子伝達媒介です.
  • 効率的な分子システムを設計するには ET率に影響を与える要因を理解することが重要です.

研究 の 目的:

  • dpaRリガンドを持つCuII/I複合体の電子転移自己交換速度の定数 (k11) を調査する.
  • 銅複合体の構造動態とET効率を相関させる.
  • これらの複合体のET特性を青銅タンパク質と比較する.

主な方法:

  • 速度定数を決定するために核磁気共鳴 (NMR) 線幅拡大実験を活用した.
  • 銅複合体,特にdpaOMeとdpaSMeを二酸化コリアニリン (dpa) リガンドで合成し特徴づけました.
  • 異なる酸化状態における銅複合体の構成動態を分析した.

主要な成果:

  • [CuCl (dpaOMe) ]+/0 (2.48 × 10^5 M^-1 s^-1) と [CuCl (dpaSMe) ]+/0 (2.21 × 10^6 M^-1 s^-1) の大きなk11値が報告されている.
  • [CuCl ((dpaSMe) ]+/0複合体は,青銅のタンパク質に匹敵する,分子銅複合体の中で最も速いET率を示す.

さらに関連する動画

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

9.3K

関連する実験動画

Last Updated: Jul 17, 2025

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
11:04

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

Published on: September 7, 2019

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

9.3K
  • CuI (dpaOMe) またはCuII (dpaSMe) コンプレックスにおけるコンフォルメーションダイナミクスは,内球再構成エネルギー (それぞれ0.71および0.62 eV) を最小限にしました.

    • 結論:

    • dpaRリガンドによって促進される銅複合体の構成動力は,電子伝送率を大幅に高めます.
    • この発見は,青銅タンパク質のエンタティック状態モデルにおける剛性の強調と対照的である.
    • この研究は,分子システムにおける急速な電子移転を媒介するダイナミックな構成均衡の重要性を強調しています.