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相关概念视频

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
Structural Isomerism02:34

Structural Isomerism

19.1K
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...
19.1K
Isomerism02:43

Isomerism

18.0K
Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
18.0K
Stereoisomers02:32

Stereoisomers

12.5K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
12.5K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

8.7K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.7K
Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

11.8K
Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
11.8K

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相关实验视频

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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry
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异金属分子和离子异构体.

Yuxuan Zhang1, Zheng Wei1, Haixiang Han2

  • 1Department of Chemistry, University at Albany, Albany, New York 12222, United States.

Inorganic chemistry
|October 4, 2024
PubMed
概括

研究人员发现了新的无机分子和离子异构体,NaCrFe (((acac) 3 ((hfac) 3),在金属复合体中扩大结构异构体. 这些独特的同位素表现出各种各样的特性,并使用先进的技术进行了表征.

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科学领域:

  • 无机化学 无机化学
  • 协调化学 协调化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 在有机化学中,结构性异构是很好的记录,特别是与尿素和酸.
  • 然而,在金属复合体中,分子与离子同质的探索较少.
  • 多核和异金属化合物为新型异构体提供了独特的机会.

研究的目的:

  • 介绍和描述一个新类别的无机分子与离子结构异构体.
  • 合成和分析具有这种同质性潜力的异金属化合物.
  • 研究这些同位素的独特性质和相互转换.

主要方法:

  • 合成和分离的分子和离子异构体的[NaCrFe(acac) 3 ((hfac) 3 .
  • 使用同步龙X射线共振衍射,X射线光光谱学,Mössbauer光谱学和DART质谱学进行表征.
  • 分析可溶性,挥发性,质谱电离和热行为差异的分析.

主要成果:

  • 成功地分离和表征了分子[CrIII(acac) 3-Na-FeII(hfac) 3和离子{[CrIII(acac) 3-Na-CrIII(acac) 3+[FeII(hfac) 3-Na-FeII(hfac) 3}异构体.
  • 证明分子和离子形式之间的明显的物理和化学特性.
  • 确认分子结构是异金属和离子结构是异金属实体.

结论:

  • 已为无机异金属化合物建立了一个新的分子与离子结构异构体类别.
  • 这些同位素具有显著不同的特性,为量身定制的材料设计提供了途径.
  • 这些发现扩大了对复杂无机系统中结构异构的理解.