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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Anionic Chain-Growth Polymerization: Overview01:20

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,...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
Anionic Chain-Growth Polymerization: Mechanism01:04

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.
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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,...

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A Polyaniline-based Sensor of Nucleic Acids
07:58

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Polymers for anion recognition and sensing.

Ali Rostami1, Mark S Taylor

  • 1Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada.

Macromolecular Rapid Communications
|November 1, 2011
PubMed
Summary
This summary is machine-generated.

Chemists are developing synthetic macromolecules for anion recognition, mimicking nature's optimized proteins. These advanced polymers offer signal amplification and cooperative effects for sensing applications.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Chemical Sensing

Background:

  • Biological systems utilize evolved macromolecular hosts (anion-binding proteins) for selective anion recognition.
  • Synthetic chemists are beginning to develop artificial macromolecules for anion detection.
  • Anion recognition is crucial for applications in medicine, security, and environmental monitoring.

Purpose of the Study:

  • To review the systematic development of synthetic anion-responsive macromolecules.
  • To highlight the potential of polymeric systems in anion recognition and sensing.
  • To showcase the diverse chemical interactions and structures employed.

Main Methods:

  • Exploration of Lewis acid/base interactions for anion binding.
  • Utilizing ion-pairing interactions in macromolecular design.
  • Employing hydrogen bonding strategies for anion recognition.
  • Investigating signal amplification, multivalency, and cooperative effects in polymers.

Main Results:

  • Development of structurally diverse anion-responsive synthetic macromolecules.
  • Demonstration of unique polymeric features enhancing anion recognition and sensing.
  • Successful application of various interaction types (Lewis acid/base, ion-pairing, H-bonding).

Conclusions:

  • Synthetic macromolecules can effectively mimic and potentially surpass biological anion recognition.
  • Polymeric systems offer unique advantages like signal amplification and cooperativity for anion sensing.
  • Diverse chemical strategies enable the creation of sophisticated anion-responsive materials.