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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

12.8K
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...
12.8K
Valence Bond Theory02:42

Valence Bond Theory

10.1K
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...
10.1K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.5K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.5K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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,...
1.2K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.6K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
2.6K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.3K
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...
1.3K

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関連する実験動画

Updated: Nov 16, 2025

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Published on: December 11, 2021

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光感知調整誘発スピン状態スイッチ

Hannah Kurz1, Konstantin Schötz2, Ilias Papadopoulos3

  • 1Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany.

Journal of the American Chemical Society
|February 26, 2021
PubMed
まとめ
この要約は機械生成です。

スピンの状態の変化を感知するための光ニッケル (II) コンプレックスを開発しました. これらのコンプレックスはデジタルセンシング機能を提供し,既存の協調数誘導スピン状態 (CISSS) の検出方法を大幅に改善します.

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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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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

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科学分野:

  • 協調化学
  • 材料科学
  • センサー技術

背景:

  • 座標数誘導スピン状態 (CISSS) はスマートセンサーの鍵ですが,敏感な検出は欠けている.
  • 既存のCISSS検出方法はしばしば無感で,実用的な応用が限られている.

研究 の 目的:

  • 繊細なCISSS検出のための新しいニッケル (II) 複合体を合成する.
  • これらの複合体の光性能を検知用途で調査する.
  • 光 quenching に基づくデジタルセンシングプラットフォームを確立する.

主な方法:

  • フェナジン基シフ基リガンドによるニッケル (II) 複合体の合成と特徴付け
  • 溶液相光学 (NMR,UV-vis) と単結晶X線微分法
  • 温度に依存する寿命と量子力学の研究
  • CISSSメカニズムを理解するための理論的モデリング.

主要な成果:

  • 4つの平面ニッケル (II) 複合体を合成し,特徴づけました.
  • 光 quenching を使用して,敏感なCISSS検出が実証されています.
  • デジタル (オン/オフ) 光反応が軸性リガンド添加に観察されました.
  • FD-CISSSは,吸収ベースの方法と比較して,より高い感度を示した.

結論:

  • CISSS検出のための非常に敏感な光ニッケル (II) コンプレックスを開発した.
  • 光 quenching に基づくデジタルセンシングメカニズムを確立しました.
  • 先進的なスマートセンサ材料のためのこれらのコンプレックスの可能性を強調しました.