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Crown Ethers

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.

Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

Polymers

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

Structure and Nomenclature of Ethers

Structure and Nomenclature of Ethers

Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent groups, ethers can be classified into two...

Olefin Metathesis Polymerization: Overview

Olefin Metathesis Polymerization: Overview

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...

Characteristics and Nomenclature of Homopolymers

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Published on: January 10, 2017

Supramolecular polymers constructed by crown ether-based molecular recognition.

Bo Zheng¹, Feng Wang, Shengyi Dong

¹Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China.

Chemical Society Reviews

|October 21, 2011

Summary

This summary is machine-generated.

Crown ether-based molecular recognition is advancing supramolecular polymers. This review classifies these polymers by topology, highlighting recent progress in their design and applications.

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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

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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:

Polymer Science
Supramolecular Chemistry
Materials Science

Background:

Supramolecular polymers, systems beyond individual molecules, are gaining attention for applications in stimuli-responsive materials, self-healing materials, and drug delivery.
Crown ether-based molecular recognition motifs offer high selectivity and environmental responsiveness, making them valuable for constructing advanced polymer systems.

Purpose of the Study:

To provide a tutorial review on supramolecular polymers utilizing crown ether-based molecular recognition.
To classify supramolecular polymers based on topological differences.
To cover recent advancements in the integration of crown ether chemistry and polymer science.

Main Methods:

Classification of supramolecular polymers by topology.
Review of recent literature on crown ether-mediated supramolecular polymer fabrication.
Analysis of properties and applications arising from this integration.

Main Results:

Supramolecular polymers can be effectively classified based on their topology.
Crown ether-based recognition enables the creation of supramolecular polymers with tailored properties.
Recent advances demonstrate novel applications in responsive and healable materials.

Conclusions:

The combination of crown ether recognition and polymer science is a rapidly advancing field.
Topological classification provides a useful framework for understanding these complex systems.
Further research promises new materials with enhanced functionalities for diverse applications.