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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Structural Isomerism02:34

Structural Isomerism

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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...
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Stereoisomerism02:52

Stereoisomerism

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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...
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Isomerism in Alkenes02:01

Isomerism in Alkenes

14.5K
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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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,...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.4K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Updated: Dec 24, 2025

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Structural Isomerism Effect in Platinum(II) Acetylide-Based Supramolecular Polymers.

Ze Chen1, Yuncong Xue1, Mingliang Gui1

  • 1CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

Inorganic Chemistry
|April 11, 2020
PubMed
Summary

Structural isomerism in platinum(II) acetylide compounds significantly impacts supramolecular polymer properties. Minor molecular changes lead to distinct thermostability and rheological moduli in these π-functional materials.

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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
  • Materials Science
  • Organometallic Chemistry

Background:

  • Self-assembly of π-aromatic molecules forms ordered supramolecular polymers.
  • Molecular parameters and external conditions influence self-assembly.
  • Structural isomerism is a key factor in modulating self-assembly.

Purpose of the Study:

  • Investigate the effect of structural isomerism on π-aromatic platinum(II) acetylide compounds.
  • Design and synthesize two distinct structural isomers.
  • Analyze their self-assembly behavior and resulting supramolecular polymer properties.

Main Methods:

  • Design and synthesis of platinum(II) acetylide structural isomers with varied N-hexyl substitution.
  • Investigation of self-assembly in apolar media using nucleation-elongation mechanism.
  • Characterization of supramolecular polymers using spectroscopy, thermal analysis, and rheology.

Main Results:

  • Both isomers form supramolecular polymers via cooperative nucleation-elongation.
  • Thermal hysteresis observed, indicating different cooling/heating pathways.
  • Distinct thermostability and rheological moduli demonstrated due to varied binding enthalpies.

Conclusions:

  • Structural isomerism profoundly affects supramolecular polymer properties.
  • Minor molecular modifications yield significant differences in material characteristics.
  • Highlights the importance of isomerism for rational design of π-functional supramolecular materials.