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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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Author Spotlight: Accelerating Discovery in Microporous Material Chemistry
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Heterometallic Molecular and Ionic Isomers.

Yuxuan Zhang1, Zheng Wei1, Haixiang Han2

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

Inorganic Chemistry
|October 4, 2024
PubMed
Summary
This summary is machine-generated.

Researchers discovered new inorganic molecular and ionic isomers, [NaCrFe(acac)3(hfac)3], expanding structural isomerism in metal complexes. These distinct isomers exhibit varied properties and were characterized using advanced techniques.

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Area of Science:

  • Inorganic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Structural isomerism is well-documented in organic chemistry, notably with urea and ammonium cyanate.
  • However, molecular vs. ionic isomerism is less explored in metal complexes.
  • Polynuclear and heterometallic compounds present unique opportunities for novel isomerism.

Purpose of the Study:

  • To introduce and characterize a new class of inorganic molecular vs. ionic structural isomers.
  • To synthesize and analyze heterometallic compounds with potential for this isomerism.
  • To investigate the distinct properties and interconversion of these isomers.

Main Methods:

  • Synthesis and isolation of molecular and ionic isomers of [NaCrFe(acac)3(hfac)3].
  • Characterization using synchrotron X-ray resonant diffraction, X-ray fluorescence spectroscopy, Mössbauer spectroscopy, and DART mass spectrometry.
  • Analysis of solubility, volatility, mass spectrometry ionization, and thermal behavior differences.

Main Results:

  • Successful isolation and characterization of molecular [CrIII(acac)3-Na-FeII(hfac)3] and ionic {[CrIII(acac)3-Na-CrIII(acac)3]+[FeII(hfac)3-Na-FeII(hfac)3]-} isomers.
  • Demonstration of distinct physical and chemical properties between the molecular and ionic forms.
  • Confirmation of the molecular structure as heterotrimetallic and ionic structures as heterobimetallic entities.

Conclusions:

  • A new class of molecular vs. ionic structural isomers has been established for inorganic heterometallic compounds.
  • These isomers exhibit significantly different characteristics, offering avenues for tailored material design.
  • The findings broaden the understanding of structural isomerism in complex inorganic systems.