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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
709
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.6K
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...
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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 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...
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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電子刺激によって誘発されたニオン中心の調整によるスピン状態の切り替え

Shaymaa Al Shehimy1, Orsola Baydoun1, Sandrine Denis-Quanquin1

  • 1ENSL, CNRS, Laboratoire de Chimie UMR 5182, 46 allée d'Italie, 69342 Lyon, France.

Journal of the American Chemical Society
|September 26, 2022
PubMed
まとめ

この研究では,スピン状態の切り替え可能な新しいNi (II) -ポルフィリン複合体を導入した. 電気刺激は,スピン状態を低から高に逆行的に制御し,80%のスイッチング効率を達成します.

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科学分野:

  • 超分子化学
  • 協調化学
  • 材料科学

背景:

  • ニッケル (II) -ポルフィリン複合体は,独自の電子および磁気特性で知られています.
  • 分子システムにおけるスピン状態の制御は 先進的な電子・磁気装置の開発に不可欠です
  • 形状の変化を誘導し 分子特性を調節する経路を提供する.

研究 の 目的:

  • イミダゾールリガンドに電子反応性メカニカルヒンジーを介して結合したNi (II) -ポルフィリン複合体を合成し,特徴づけること.
  • 機械的なハンドルの電気刺激による可逆折り合いの動きを調査する.
  • 低スピンから高スピンへのNi (II) センターのスピン状態の切り替えを調査する.

主な方法:

  • Ni (II) -ポルフィリン-イミダゾール結合物の合成
  • 折り畳みの動きを誘導し制御する電気化学的方法.
  • 核磁共振 (NMR) スペクトロスコーピー
  • 電気化学測定について
  • 磁気特性分析について
  • 量子化学の計算をする

主要な成果:

  • 柔軟なメカニカルハンドルでNi (II) -ポルフィリン-イミダゾールシステムの成功合成.
  • 電気刺激によって引き起こされる 幅広く完全に逆転可能な折り畳み運動の実証
  • イミダゾールによる低スピン (S = 0) から高スピン (S = 1) へのNi ((II) センターの80%効率的なスピン状態の切り替えの観察.
  • 折り畳み運動の原動力としてバイオゲンカチオンラジカルのπ-二酸化を特定する.

結論:

  • 開発された分子システムは,電気的に制御され,可逆のスピン状態のスイッチングを示す.
  • この研究は,分子材料の磁性特性を調節するための電子反応性機械ヒンジーの可能性を実証しています.
  • この発見により,新しい分子スイッチや刺激に反応する磁気材料の設計が 可能になりました