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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Structure of Amines01:19

Structure of Amines

The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
Structural Isomerism02:34

Structural Isomerism

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 be...
Electrophilic Aromatic Substitution: Overview01:16

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In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

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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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Interactions in supramolecular complexes involving arenes: experimental studies.

Hans-Jörg Schneider1

  • 1FR Organische Chemie der Universität des Saarlandes, Saarbrücken, Germany.

Accounts of Chemical Research
|August 3, 2012
PubMed
Summary

This study explores noncovalent aromatic interactions in supramolecular chemistry, highlighting their role in designing new host molecules and functional systems. Understanding these binding forces aids in developing predictive tools for drug design and creating advanced sensors.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Chemical Sensing

Background:

  • Learning by doing has advanced supramolecular chemistry, particularly understanding noncovalent aromatic interactions.
  • Host molecule preparation and complexation studies offer insights into binding mechanisms.
  • Arene-based hosts provide controlled conformations and interactions, unlike saturated frameworks.

Purpose of the Study:

  • To discuss significant binding contributions involving aromatic units and their practical applications.
  • To explore the use of arene-based macrocycles for structural variation and binding mechanism studies.
  • To compare noncovalent interactions in supramolecular complexes for potential applications with biopolymers.

Main Methods:

  • Preparation of new host molecules and investigation of their complexations.
  • Systematic analysis of complexes in solution, including flat aromatic systems like porphyrins.
  • Equilibrium measurements to derive binding free energy increments for different interactions.

Main Results:

  • Arene-based macrocycles offer greater structural variation than natural hosts like cyclodextrins.
  • Fluorescent aryl systems are suitable for sensor development.
  • Binding free energy increments are often additive, providing predictive tools for supramolecular system design.

Conclusions:

  • Noncovalent aromatic interactions are crucial for designing functional supramolecular systems and sensors.
  • Systematic analysis of binding forces aids in drug design and computational chemistry.
  • Water-soluble, arene-containing receptors with permanent charges facilitate potential applications.