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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...

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Discovery and Synthesis Optimization of Isoreticular Al(III) Phosphonate-Based Metal-Organic Framework Compounds Using High-Throughput Methods
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相互可转换的模块化框架和分层的兰坦化 (III) - 乙烯基酸协调聚合物.

F N Shi1, L Cunha-Silva, R A Sa Ferreira

  • 1Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.

Journal of the American Chemical Society
|December 14, 2007
PubMed
概括

合成了新的微孔和分层协调聚合物,这些聚合物是基于乙烯酸的. 这些材料表现出石类型的行为和可调节的光发光特性,具有框架和分层结构之间相互转换的潜力.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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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
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 协调聚合物提供可调节的结构和特性.
  • 微孔材料对于分离和催化是至关重要的.
  • 基于兰化物的材料具有独特的光发光特性.

研究的目的:

  • 合成和结构性表征新型同结构模块化微孔和分层协调聚合物.
  • 为了研究框架材料的热稳定性和热带石类型的行为.
  • 探索这些化合物的光发光特性和结构互转换.

主要方法:

  • 热水合成的热水合成
  • 单晶和粉末X射线衍射的X射线衍射.
  • 固态NMR光谱学 固态NMR光谱学
  • 热重力测量分析分析
  • 光发光光谱学 光发光光谱学

主要成果:

  • 成功合成了框架类型的Na2[Y(hedp) ((H2O) 0.67]和Na4[Ln2 ((hedp) 2 ((H2O) 2].nH2O,以及分层协调聚合物[Eu ((H2hedp) ((H2O) 2].H2O,Na0.9[Nd0.9Ge0.10 ((Hhedp) ((H2O) 2],[Ln ((H2hedp) ((H2O) 3H2O,和[Yb ((H2hedp) ]H2O.
  • 框架材料表现出可逆的水分去除,并保持高达475°C的结构完整性,表现出岩类型的行为.
  • 含有Eu的化合物的光发光特性对水合很敏感.
  • 通过受控的合成条件 (例如,添加HCl或NaCl) 可以实现3D框架和分层结构之间的相互转换.
  • 基于一个 (H2O) 13集群的独特的2D水网络在分层的[Y(H2hedp) ((H2O) ]中观察到.

结论:

  • 基于埃迪龙酸的新型微孔和分层协调聚合物已成功合成和表征.
  • 这些材料表现出有前途的热带石类型行为和可调节的光发光,在分离和传感方面有潜在的应用.
  • 观察到的结构互转凸显了水热合成在设计复杂无机材料方面的多功能性.