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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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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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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...
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ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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Creating molecular macrocycles for anion recognition.

Amar H Flood1

  • 1Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.

Beilstein Journal of Organic Chemistry
|June 25, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed new shape-persistent macrocycles for anion binding. These triazolophane macrocycles, created using click chemistry, demonstrate effective anion capture and enable computer-aided receptor design for advanced applications.

Keywords:
anion receptors macrocycles self-assembly surface architectures switches

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Development of shape-persistent macrocycles is crucial for molecular recognition.
  • 1,2,3-triazoles, synthesized via click chemistry, show potential in anion binding.

Purpose of the Study:

  • To create novel macrocycles with shape persistence and anion-binding capabilities.
  • To leverage understanding from anion recognition studies for improved receptor design.
  • To design and synthesize new macrocyclic receptors, cyanostars and tricarb.

Main Methods:

  • Utilizing click chemistry for the synthesis of 1,2,3-triazole-based macrocycles.
  • Investigating anion binding properties of newly synthesized macrocycles.
  • Employing computational methods and theoretical understanding for receptor design.

Main Results:

  • Successful creation of triazolophane macrocycles capable of anion capture.
  • Design and synthesis of cyanostars, larger macrocycles that bind large anions.
  • Development of tricarb, a macrocycle favoring large anions and exhibiting self-assembly properties.

Conclusions:

  • New classes of shape-persistent macrocycles have been successfully developed.
  • Understanding anion recognition has advanced computer-aided receptor design.
  • The synthesized macrocycles, cyanostars and tricarb, offer platforms for future nanostructure design.