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関連する概念動画

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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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...
9.4K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Induced Electric Dipoles01:28

Induced Electric Dipoles

4.4K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
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Updated: Sep 10, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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キラル・ディスプロシウム複合体に対するスピン電気効果

Leonardo Tacconi1, Alberto Cini2, Arsen Raza1,3

  • 1Department of Chemistry "Ugo Schiff", University of Florence and INSTM Research Unit, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy.

Journal of the American Chemical Society
|August 26, 2025
PubMed
まとめ
この要約は機械生成です。

ランタナイド複合体におけるスピン・エレクトリック効果 (SEE) を観察し,分子ベースのスピントロニクスの可能性を示しました. この研究は,電場が分子スピン状態にどのように影響するかを強調し,新しいチューニングの可能性を提供します.

さらに関連する動画

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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関連する実験動画

Last Updated: Sep 10, 2025

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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科学分野:

  • 分子スピントロニクス
  • 量子化学について
  • 固体物理学

背景:

  • スピン・エレクトリック・エフェクト (SEE) は,低電力のスピントロニクスにとって不可欠な,電場による分子スピン状態に影響を与える.
  • 分子系におけるSEEの達成は,弱いスピン電場結合により困難である.

研究 の 目的:

  • 単核ランタニド複合体におけるSEEを実験的に観察し,特徴づけること.
  • SEEにおける分子対称性と結晶場パラメータの役割を明らかにする.

主な方法:

  • 電場調節電子パラマグネティック共振 (EFEPR) スペクトロスコーピー
  • アブ・イニシオ 量子化学計算
  • g-テンサアニソトロピーとクリスタルフィールドのパラメータの分析.

主要な成果:

  • 関連するSEEは,研究されたランタニド複合体で観察されました.
  • SEEの有意なアニソトロピーが発見され,電場に垂直なgテンサコンポーネントが最も影響を受けた.
  • 分子対称性の破裂は重要な要因として特定され,対角外結晶フィールドのパラメータは,電場に対して最も敏感であることが判明した.

結論:

  • この研究は,分子システム,特にランタニド複合体におけるSEEの実現可能性を確認した.
  • 実験構成は,スピン移行の調整のためのSEEアニソトロピーを理解することによって最適化することができます.
  • シンメトリー破裂によって引き起こされる電場媒介状態の混合は,観測されたSEEにとって中心的なものです.