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Stereoisomerism

Stereoisomerism

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...

Structural Isomerism

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...

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

Valence Bond Theory

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 Nomenclature

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...

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Supramolecular transformations within discrete coordination-driven supramolecular architectures.

Wei Wang¹, Yu-Xuan Wang¹, Hai-Bo Yang¹

¹Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, P. R. China. hbyang@chem.ecnu.edu.cn.

Chemical Society Reviews

|March 25, 2016

Summary

This summary is machine-generated.

Supramolecular transformations in coordination-driven architectures are reviewed. Diverse stimuli trigger structural changes, enabling new functions and diverse metallosupramolecular architectures.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Area of Science:

Supramolecular Chemistry
Coordination Chemistry
Materials Science

Background:

Coordination-driven self-assembled architectures offer a unique platform for studying dynamic supramolecular transformations.
The inherent rigidity and dynamic nature of coordination bonds are key to these transformations.
Metallosupramolecular architectures like helices, metallacycles, and metallacages are central to this field.

Purpose of the Study:

To provide a comprehensive review of supramolecular transformations within discrete coordination-driven supramolecular architectures.
To classify these transformations based on the various stimuli used to induce them.
To highlight the conditions, structural changes, mechanisms, and resulting properties/functions.

Main Methods:

Review of recent investigations and literature on supramolecular transformations.
Classification of transformations based on stimuli: solvents, concentration, anions, guests, composition changes, light, and post-modification.
Analysis of structural changes, transformation mechanisms, and functional outcomes.

Main Results:

Supramolecular transformations can be effectively triggered by a wide range of external stimuli.
These transformations lead to the formation of novel supramolecular architectures with tailored properties and functions.
The study categorizes transformations by stimulus, detailing conditions, mechanisms, and functional outputs.

Conclusions:

Supramolecular transformations represent a powerful strategy for generating diverse and functional metallosupramolecular architectures.
Understanding these transformations is crucial for designing advanced materials with specific applications.
The dynamic nature of coordination bonds facilitates controlled structural interconversions.