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相关概念视频

Structural Isomerism02:34

Structural Isomerism

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 be...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in 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...
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...

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相关实验视频

Updated: Jul 11, 2026

Synthesis of a Water-soluble Metal–Organic Complex Array
06:40

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

由相位过渡引发的自旋状态的切换:自组合铁的自旋交叉特性 (II) 复合物与基结合的三醇配体的复合物.

Tsuyohiko Fujigaya1, Dong-Lin Jiang, Takuzo Aida

  • 1Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal of the American Chemical Society
|December 3, 2003
PubMed
概括
此摘要是机器生成的。

具有长链的铁 (II) 复合物表现出与相变相关的旋转交叉行为. 这种旋转交叉是由相互数字化的基链以可逆的方式化引发的.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

相关实验视频

Last Updated: Jul 11, 2026

Synthesis of a Water-soluble Metal–Organic Complex Array
06:40

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

科学领域:

  • 材料科学 材料科学 材料科学
  • 无机化学 无机化学 有机化学
  • 超分子化学 超分子化学

背景情况:

  • 旋转交叉 (SCO) 材料是可以在低旋转和高旋转状态之间切换的协调复合体.
  • 这种SCO现象对温度,压力和光等外部刺激很敏感.
  • 设计具有可调节性质和独特过渡机制的SCO材料对于先进的应用至关重要.

研究的目的:

  • 为了研究铁的旋转交叉行为 (II) 具有不同链长度的三醇复合物.
  • 阐明分子结构,自我组装和旋转状态过渡之间的关系.
  • 探索这些材料作为热可逆自旋交叉系统的潜力.

主要方法:

  • 合成具有C8,C12和C16基链的铁 (II) 三醇复合物.
  • 使用扩展X射线吸收细结构 (EXAFS) 和X射线衍射 (XRD) 进行表征.
  • 热分析包括差分扫描热量计 (DSC) 和可变温度红外线 (VT-IR) 和X射线衍射 (VT-XRD).

主要成果:

  • 与C12和C16链 ((C12trz) FeII和 (C16trz) FeII) 的铁 (II) 复合体表现出显著的旋转交叉行为.
  • 一个具有较短C8链 ((C8trz) FeII) 的三醇复合体显示出较差的反应.
  • (C16trz) FeII表现出一个相互数字化的自我组装结构,由链的化引发的自旋状态过渡.
  • 旋转交叉是热可逆的,可以在不降解的情况下重复.

结论:

  • 铁中的长基链(II) 三醇复合物对于诱导强大的自旋交叉特性至关重要.
  • 观察到的旋转交叉与交叉的基链的相位过渡直接相关,作为"锁释"机制.
  • 这些复合物代表可回收,温度驱动的自旋交叉材料的有希望的候选者.