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相关概念视频

Colors and Magnetism03:02

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 Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

911
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...
911
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

957
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,...
957
Stereoisomerism02:52

Stereoisomerism

11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.8K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.3K
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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相关实验视频

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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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螺旋交叉 (spin-crossover cobalt) 复合体,在溶液中表现出温度和度相关的光学变化.

Naoki Izumiyama1, Shun Fujii1, Kiichi Kato2

  • 1Department of Material Science, Graduate School of Science, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan. nakaya@josai.ac.jp.

Dalton transactions (Cambridge, England : 2003)
|May 20, 2024
PubMed
概括

((II) 复合物与特皮里丁配体表现出由反离子和溶剂影响的自旋交叉行为. 这项研究揭示了旋转状态如何影响溶液中的光谱性质.

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
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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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科学领域:

  • 协调化学 协调化学
  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学.

背景情况:

  • (II) 复合物以其多样化的自旋状态而闻名,影响其物理和化学性质.
  • 金属复合体中的旋转交叉现象对于开发分子开关和传感器至关重要.
  • 二连接物为金属离子提供了多功能协调环境.

研究的目的:

  • 在固体和溶液阶段研究 (II) 复合物与新型特皮里丁配体的旋转状态.
  • 了解对抗离子 (PF6和BPh4) 对自旋交叉行为的影响.
  • 探索各种有机溶剂中自旋状态和光谱特性之间的关系.

主要方法:

  • 合成和表征 (II) 复合物: [Co(L1) 2) (X) 2) 和 [Co(L2) 2) (X) 2.
  • 变温度研究 (5-400K) 确定固态中自旋状态.
  • 紫外线-Vis吸收光谱用于监测溶液中的自旋状态变化作为温度和度的函数.

主要成果:

  • 与PF6-对抗离子的复合物在固态中呈现逐渐的自旋交叉.
  • 由于分子合作性降低,与BPh4-对抗离子的复合体仍然处于高旋转状态.
  • 溶液中的吸收光谱显示了与旋转状态相关的温度和度依赖的效应.

结论:

  • ((II) terpyridine 复合物的旋转状态对对抗离子的性质和物理状态敏感.
  • 分子合作性在调解旋转交叉行为的过程中起着重要作用.
  • 光谱技术为这些复合物在溶液中的动态旋转状态提供了宝贵的见解.