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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

12.0K
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...
12.0K
Valence Bond Theory02:42

Valence Bond Theory

8.8K
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...
8.8K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
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...
26.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

685
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.
685
Paramagnetism01:30

Paramagnetism

2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K

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関連する実験動画

Updated: Jul 26, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

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

Published on: April 14, 2020

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溶液中のパラマグネティックランタニド化合物の構造的進化は,時間とアンサンブル平均構造と比較される.

Barak Alnami1, Jon G C Kragskow1, Jakob K Staab1

  • 1Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K.

Journal of the American Chemical Society
|June 16, 2023
PubMed
まとめ
この要約は機械生成です。

MRIコントラスト剤の磁性アニソトロピーは,パラマグネティックシフトに大きな影響を及ぼします. ダイナミックシミュレーションは,NMR/MRIの行動とリラックス時間を正確にモデル化するために不可欠な大きな分子幾何学的な変動を明らかにします.

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
13:21

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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

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関連する実験動画

Last Updated: Jul 26, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

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

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
13:21

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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

8.6K

科学分野:

  • 磁気共鳴
  • コンピュータ化学
  • バイオ物理学

背景:

  • 磁気感受性アニソトロピーは,核磁気共鳴 (NMR) と磁気共鳴画像 (MRI) のパラマグネティックシフトの鍵です.
  • C3対称MRIコントラスト剤に関する以前の研究では,磁気アニソトロピーに影響する分子幾何学と溶媒の相互作用に対する感度が強調されました.
  • 理想化された構造モデルは,溶液中の分子のダイナミックな性質を捉えることができない.

研究 の 目的:

  • 溶液中のランタニドベースのMRIコントラスト剤のダイナミックな分子幾何学を,アブ・イニシオ分子ダイナミクスを用いて調査する.
  • ランタニド-酸素結合角度のダイナミックな変化が単一分子レベルで磁性アニソトロピーとパラマグネティックシフトにどのように影響するかを理解する.

主な方法:

  • 溶液中のダイナミックな分子幾何学をモデル化するための分子ダイナミクスシミュレーション.
  • マグネティックアニソトロピーを決定するために,アクティブスペース自己一貫性フィールド (CASSCF) のスピン軌道計算を完了します.
  • O-Ln-C3の角度での振動の分析と偽接触シフトとの相関.

主要な成果:

  • ランタニド-酸素結合と偽C3軸の間の角度で大きな振幅の振動を観測した.
  • これらの幾何学的な変動が偽接触 (二極) パラマグネティックなNMRシフトで重要な振動を引き起こすことが実証された.
  • 時間の平均的なシフトは実験データとよく一致しますが 変動は静的なモデルの限界を強調します

結論:

  • ダイナミック分子幾何学はMRIコントラスト剤のパラマグネティックシフトの決定に重要な役割を果たします.
  • 理想化された構造モデルは,溶液の動態とそのNMR/MRIパラメータへの影響を完全に記述するのに不十分です.
  • 発見は,磁気感受性に敏感なシステムにおける電子と核のリラックス時間のための高度なモデリングアプローチを必要とします.