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Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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A polythreading array formed by a (3,5)-connected 3D anionic network and 1D cationic chains: synthesis, structure,

Min Li¹, Shan Zhao, Yan-Fen Peng

¹Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.

Dalton Transactions (Cambridge, England : 2003)

|May 22, 2013

Summary

A novel copper(II) coordination polymer was synthesized and characterized. This unique polythreaded material demonstrates catalytic activity in the degradation of methyl orange, showcasing its potential in environmental applications.

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Published on: June 20, 2019

Area of Science:

Materials Science
Coordination Chemistry
Catalysis

Background:

Coordination polymers offer tunable structures and properties.
Polythreading in coordination networks presents unique structural complexity.
Developing efficient catalysts for pollutant degradation is crucial.

Purpose of the Study:

To synthesize and characterize a novel copper(II) coordination polymer.
To investigate the structural features of the polythreaded network.
To evaluate the catalytic activity of the synthesized material for methyl orange degradation.

Main Methods:

Hydrothermal synthesis.
X-ray structural analysis.
Catalytic performance testing for methyl orange degradation.
Thermal analysis.

Main Results:

A unique copper(II) coordination polymer {[Cu(tmtz)(H2O)4][Cu2(tmtz)2(sip)2]·4H2O}n (1) was synthesized.
The structure features two distinct polythreaded polymeric motifs: a 3D anionic network and a 1D cationic chain.
The material exhibited catalytic activity in the degradation of methyl orange.

Conclusions:

The successful synthesis of a complex polythreaded copper(II) coordination polymer.
The structural complexity arises from the interpenetration of anionic and cationic networks.
The coordination polymer shows promise as a catalyst for environmental remediation.