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関連する概念動画

Molecular and Ionic Solids02:54

Molecular and Ionic Solids

17.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.1K
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

981
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
981
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

923
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...
923
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

973
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,...
973
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

12.4K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
12.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.0K
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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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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2次元スピン・クロスオーバー分子固体溶液で,90Kの間で調節可能な移行温度

Ying-Ying Wu1, Zhao-Yang Li1, Shuang Peng1

  • 1School of Materials Science and Engineering, Nankai University, 38 Tongyan Road, Haihe Educational Park, Tianjin 300350, China.

Journal of the American Chemical Society
|February 27, 2024
PubMed
まとめ

研究者は,90 Kの間で調節可能な移行温度 (Tc) を有する新しいスピンクロスオーバー (SCO) 材料を開発しました.この進歩は,分子デバイスにおけるビスタブル分子スイッチの潜在的なアプリケーションを拡大します.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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科学分野:

  • 材料科学
  • 超分子化学
  • 固体化学

背景:

  • スピン・クロスオーバー (SCO) 材料は,ビスタブルな分子スイッチにとって有望である.
  • 現在のSCO材料は,スピン移行温度 (Tc) が限られており,実用的な使用を制限しています.
  • Tcのより広い範囲は,より広範なアプリケーションのための環境温度スペクトルをカバーするために必要です.

研究 の 目的:

  • 新しい二次元SCO固体溶液システムを開発する.
  • 幅広い範囲でスピン移行温度 (Tc) を微調整する.
  • SCO材料における分子相互作用とTcの関係を理解する.

主な方法:

  • 2次元のSCO固体溶液システムの合成: [Fe ((HL)) ((HL)) ]·H2O.
  • リガンド分数の系統的調節 (x) をTcに調整する.
  • 単結晶X線微分と周期密度関数理論 (DFT) の計算.

主要な成果:

  • リガンド分数 (x) を調整することにより,90 K (227316 K) にわたってTcの線形微調整を達成した.
  • リガンド分数 (x) が増加すると,水素結合と分子間相互作用が強化される.
  • 強化された層間相互作用はFeN2O2S2リガンドフィールドとSCOエネルギーバリアを修正し,Tcを増加させる.

結論:

  • 分子相互作用の操作によるSCO材料のTc調整のための新しい経路が確立されています.
  • 開発されたSCOシステムは,幅広い温度範囲で調整可能なビスタビリティを提供します.
  • この研究は,二重安定分子固体の応用可能性を広げています.