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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

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関連する実験動画

Updated: Jun 4, 2026

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

スピン・クロスオーバーは4座標の鉄 (((II) 複合体で発生する.

Jeremiah J Scepaniak1, T David Harris, Carola S Vogel

  • 1Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United States.

Journal of the American Chemical Society
|March 4, 2011
PubMed
まとめ
この要約は機械生成です。

この研究は,鉄 (((II) 複合体のスピン移行を詳細に説明し,81 Kで低 (S=0) から高 (S=2) のスピン状態にシフトします.観測された構造の変化には,電子構造理論によって説明される変化した鉄-リガンド結合長が含まれています.

さらに関連する動画

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

関連する実験動画

Last Updated: Jun 4, 2026

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
11:44

Spin Saturation Transfer Difference NMR (SSTD NMR): A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes

Published on: November 12, 2016

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

科学分野:

  • 無機化学 無機化学とは
  • 材料科学は材料科学である.
  • 固体物理学 固体物理学とは

背景:

  • 鉄複合体のスピン移行現象は,分子スイッチやセンサーの開発に不可欠です.
  • 電子構造と磁気特性との関係を理解することは,機能的な材料の設計の鍵です.

研究 の 目的:

  • 4座標の鉄 (((II) フォスフォランイミナート複合体のスピン移行を調査する.
  • 構造的および電子的変化と観測されたスピン移行を相関させる.

主な方法:

  • 移行温度を決定するための変数温度磁気測定.
  • スピンの状態を確認するために,Mössbauerスペクトロスコーピーを使用します.
  • 構造変化を分析するために,可変温度単結晶X線微分法.

主要な成果:

  • 鉄 (((II) 複合体PhB ((MesIm) (((3) Fe-NPPh ((3) は,81 Kの臨界温度 (T ((C)) で,S=0からS=2へのスピン移行を示しています.
  • 構造分析では,Fe-CとFe-Nの結合距離が増加し,移行中にN-P結合距離が減少することが示されています.
  • 電子構造理論は,観測された構造的および磁気的行動の解釈を提供します.

結論:

  • この研究では,新しい鉄 (II) 複合体におけるスピン移行を成功裏に特徴づけました.
  • この発見は,協調複合体における電子構成,分子構造,磁気特性との相互作用を強調している.
  • この研究は,スピンクロスオーバー材料の基本的な理解に貢献します.