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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 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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Structural Isomerism

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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...
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部分氧化诱导的电导性和对磁性在Ni (II) 中[14]

Yi Jiang1, Inseon Oh2, Se Hun Joo3

  • 1Center for Multidimensional Carbon Materials (CMCM) , Institute for Basic Science (IBS) , Ulsan 44919 , Republic of Korea.

Journal of the American Chemical Society
|October 15, 2019
PubMed
概括
此摘要是机器生成的。

我们合成了一种新的二维金属有机框架 (NiTAA-MOF) 用Ni(II) tetraaza[14]annulene配体. 化学氧化显著增加了其电导率,突出显示了联体氧化在二维MOF中的作用.

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科学领域:

  • 材料科学
  • 化学学
  • 固态物理

背景情况:

  • 二维金属有机框架 (MOF) 是各种应用的有希望的材料.
  • 了解二维MOF的电导率对于其技术进步至关重要.
  • 结合的宏环联体在MOF结构中具有独特的电子性质.

研究的目的:

  • 合成和描述一种新的2D结合的Ni(II) [14]与烯结合的金属有机框架 (NiTAA-MOF).
  • 研究化学氧化对NiTAA-MOF电导性的影响.
  • 探索合成材料的磁性特性和潜在应用.

主要方法:

  • 使用Ni(II) 四基[14]的NiTAA-MOF合成.
  • 通过福里埃变换红外,X射线光辐射和X射线衍射光谱进行结构阐明.
  • 密度函数理论 (DFT) 计算用于结构分析.
  • 在诱导化学氧化之前和之后的电导度测量.
  • 磁化测量以确定磁性特性.

主要成果:

  • 2D NiTAA-MOF的成功合成和表征.
  • 在氧化时,绝缘NiTAA-MOF (导电率<10^-10 S/cm) 变得导电 (0.01 S/cm).
  • 磁化研究揭示了合材料中具有弱反铁磁性合的偏磁性,归因于有机基和Ni (II) 位点.
  • 证明了联体氧化在增强二维MOF电导性的关键作用.

结论:

  • 连接体氧化是实现二维MOF电导性的关键因素.
  • 合成的NiTAA-MOF具有有趣的电子和磁性特性.
  • 潜在的应用包括催化,能量储存和动态核极化-核磁共振 (DNP-NMR).