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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

12.1K
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...
12.1K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

19.3K
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...
19.3K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.2K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
1.2K
Diamagnetism01:26

Diamagnetism

2.8K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.8K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.1K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.1K

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関連する実験動画

Updated: May 2, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

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赤道に調整されたランタニド単離磁石

Peng Zhang1, Li Zhang, Chao Wang

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, P. R. China.

Journal of the American Chemical Society
|March 15, 2014
PubMed
まとめ

研究者らは,低座標のディスプロシウム (III) とエルビウム (III) 複合体における磁気緩和を調査した. 新しい3座標のエルビウム (III) 複合体は,赤道座標を持つ最初の単一分子単核磁石として特定されました.

科学分野:

  • 協調化化学について
  • マグネチズム (磁気) とは
  • 材料科学 材料科学とは

背景:

  • 低調整ランタニド複合体は,単分子磁石 (SMM) の開発に不可欠です.
  • マグネティック・リラクゼーションのダイナミクスを理解することは,効率的なSMMを設計するための鍵です.
  • 単核ランタニドSMMにおける赤道調整は,まだ十分に研究されていない.

研究 の 目的:

  • 低座標のDy (III) 及びEr (III) 複合体の磁気リラックスダイナミクスを研究する.
  • 三角形および三角形二ピラミッド形状の三座標および五座標複合体を合成し,特徴づけること.
  • 4f要素ベースのSMMの設計を指示するシンプルモデルの可能性を実証する.

主な方法:

  • Dy (III) 及びEr (III) 複合体の合成と構造的特徴付け.
  • 磁気リラックスダイナミクスを研究するための磁気感受性測定.
  • 磁気特性を理解するための計算モデリング.

主要な成果:

  • 3座標の三角形および5座標の三角形二ピラミッド型Dy (III) とEr (III) 複合体の磁気リラックスダイナミクスは,初めて研究されました.
  • 3つの座標を持つEr (III) 複合体は,赤道座標を持つ最初の単核SMMとして特定されました.

さらに関連する動画

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

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関連する実験動画

Last Updated: May 2, 2026

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

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  • 結果は,4f要素ベースのSMMの設計における単純なモデルの有効性を検証しています.

    • 結論:

    • 低座標ランタニド複合体は,ユニークな磁気リラックスダイナミクスを表しています.
    • 最初の赤道的に調整された単核 Er (III) ベースの SMM が開発され,有望な設計戦略を強調しました.
    • この研究は,新しい単分子磁石の合理的な設計のための貴重な洞察を提供します.