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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

14.3K
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...
14.3K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

3.6K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
3.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.2K
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...
31.2K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

49.0K
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,...
49.0K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K
Structural Isomerism02:34

Structural Isomerism

21.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.8K

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関連する実験動画

Updated: Feb 25, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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EPRパラメータをCuの構造的アニソトロピーと相関させる (II) コンプレックス

Sriparna Roy1, Anirban Misra1, Satadal Paul2

  • 1Department of Chemistry, University of North Bengal, Darjeeling, India.

Journal of computational chemistry
|February 23, 2026
PubMed
まとめ

量子化学的な計算は,分子幾何学をCu (III) 複合体の電子パラマグネティック共鳴 (EPR) パラメータと関連付けています. 金属-リガンド結合は,スピン軌道結合とg値シフトに影響を与え,スピン分布パターンを明らかにします.

科学分野:

  • コンピューティング・ケミストリー
  • 量子化学とは,量子化学である.
  • スペクトロスコーピーは,スペクトロスコーピーを用います.

背景:

  • 電子パラマグネティック共鳴 (EPR) パラメータは,オープンシェル分子の電子構造と幾何学についての洞察を提供します.
  • g-テンサーや超精密結合定数などの EPR パラメータを解釈するには,堅牢な理論的枠組みが必要です.
  • 分子幾何学とスペクトル学的特徴の関係を理解することは,移行金属複合体の特徴づけに不可欠です.

研究 の 目的:

  • 擬似八面体 Cu (II) システムにおけるスペクトロスコピ的行動の電子構造の起源を解明する.
  • 分子幾何学をEPRパラメータ,特にg-テンサーと超精密結合定数と相関させる.
  • 先進的な計算方法を使用して,分子座標フレームに相対してgテンサの方向を決定する.

主な方法:

  • 密度関数理論 (DFT) と波動関数に基づく理論を用い,スピンハミルトン式パラメータを計算した.
  • 多参照構成相互作用 (MRCI) 計算を使用して,スピン軌道カップリング (SOC) とg-テンサー方向性を決定しました.
  • 自由電子のg値 (Δg) のシフトを幾何学と電子構造の指紋として分析した.

主要な成果:

  • 金属-リガンド結合特性,軌道変性,SOC,および Δg 値の間の相関を確立しました.

さらに関連する動画

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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  • 同位型 (Aiso) と並列型 (A) の高精度結合定数は,スピン分布を反映し,より高い値は,コヴァレンシーによるリガンド原子のより大きなスピン密度を示していることが実証されました.
  • 電子構造情報を使用して EPR パラメータを分子幾何学にマッピングしました.

    • 結論:

    • 量子化学計算は,分子幾何学とCu (II) 複合体の電子構造を結びつける,EPRパラメータの信頼性の高い解釈を提供します.
    • この研究は,金属-リガンド結合と分子対称性の微妙な変化に対するEPRパラメータの感受性を強調しています.
    • この研究は,gテンサーの指向と,移行金属システムにおけるスピン分布の理解のための計算的アプローチを提供します.