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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.0K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
21.0K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

995
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
995
Valence Bond Theory02:42

Valence Bond Theory

8.8K
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...
8.8K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

555
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
555
Structural Isomerism02:34

Structural Isomerism

19.4K
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...
19.4K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

21.6K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
21.6K

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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兰化物协调聚合物与软基底底托基双基比斯蒂亚酸联体.

Vasily A Ilichev1, Anton F Rogozhin1, Roman V Rumyantcev1

  • 1G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Tropinina 49, 603950 Nizhny Novgorod, Russian Federation.

Inorganic chemistry
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概括

第一个兰坦化协调聚合物 (CPs) 是使用二氧化硫酸二氧化物联体合成的,从而产生离子盐和新的二维CPs. 这些CP表现出强烈的近红外光发光 (PL) 由于链接器作为"天线".

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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
  • 摄影发光效应是一种光照效应.

背景情况:

  • 兰化物协调聚合物 (CPs) 由于其独特的光发光特性而引起人们的兴趣.
  • 迪托普硫化物联体为构建基于兰化物的新材料提供了潜力.
  • 之前的研究还没有探讨基于软基二氧化硫化链接剂的CP.

研究的目的:

  • 通过ditotic硫化连接物合成第一个类协调聚合物 (CPs).
  • 为了研究这些新型兰坦化物化合物的光发光 (PL) 特性.
  • 探索离子盐和CP之间的结构和发光差异.

主要方法:

  • 兰坦化西胺与[1,2-d:4,5-d']比斯提亚-2,6(3H,7H) - - 迪 (H2L) 反应,形成离子盐.
  • 通过加热DMSO/1,4-二氧化混合物中的离子盐来结晶2D CP.
  • 使用光谱和晶体学技术对合成化合物的表征.

主要成果:

  • 形成可溶性离子盐[Ln(DMSO) [8][L]1.5 (Ln = Nd,Gd,Er,Yb) 和2D CP [Nd(DMSO) 3L1.5·0.5二氧化物] (5).这些离子盐的形成过程中,可溶性离子盐的形成过程中,可溶性离子盐的形成过程中,可溶性离子盐的形成过程中,可溶性离子盐的形成过程中.
  • 化合物5在紫外线/蓝色激发后表现出 Nd3+ 的强烈近红外 (NIR) 光发光 (PL),其联体作为"天线".
  • 形成了无形兰化物化合物[Ln(DMSO) 3L1.5·0.5二氧化物] (Ln = Gd,Er,Yb),与离子盐相比,显示出不同的PL特性.

结论:

  • 通过使用软基二氧化硫化连接剂成功合成了第一个兰坦化协调聚合物.
  • 证明了这些CP对强烈的NIR光发光的潜力,特别是对于Nd3+.
  • 突出了结构变化 (离子盐与CP) 对化物光发光的显著影响.