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Aromatic Hydrocarbon Anions: Structural Overview01:18

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.
Due to the absence of continuous...
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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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Structure of Amines01:19

Structure of Amines

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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’...
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Aromatic amide and hydrazide foldamer-based responsive host-guest systems.

Dan-Wei Zhang1, Xin Zhao, Zhan-Ting Li

  • 1Department of Chemistry, Fudan University , 220 Handan Road, Shanghai 200433, China.

Accounts of Chemical Research
|March 29, 2014
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Summary
This summary is machine-generated.

Aromatic amide foldamers, designed using hydrogen bonding, create responsive host-guest systems. These systems exhibit controllable helical chirality and dynamic structural changes, advancing supramolecular chemistry.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Host-guest chemistry involves selective binding of guest molecules by larger host molecules.
  • Acyclic host design has been challenging, with molecular tweezers being a notable exception.
  • Hydrogen bonding-driven aromatic amide foldamers offer tunable cavities for molecular recognition.

Purpose of the Study:

  • To explore the development of responsive host-guest systems using aromatic amide and hydrazide foldamers.
  • To investigate the induction of helical chirality in foldamer systems upon guest binding.
  • To demonstrate the stimuli-responsive behavior and dynamic properties of these supramolecular architectures.

Main Methods:

  • Rational design of foldamer backbones and functional groups to control cavity properties.
  • Utilizing hydrogen bonding to direct foldamer assembly and guest binding.
  • Investigating host-guest complex formation in solution and organogel states.
  • Employing techniques to study induced helical chirality and dynamic switching behaviors.

Main Results:

  • Aromatic amide foldamers can form cavities whose shape and size are predictable and tunable.
  • Binding of guests, particularly chiral ones, induces helical chirality in foldamer systems.
  • These systems exhibit unique time-dependent properties and a "Sergeants and Soldiers" effect in organogels.
  • Reversible folding of foldamers can modulate the behavior of rotaxanes and induce intramolecular folding.

Conclusions:

  • Hydrogen bonding-driven foldamers are effective platforms for creating tunable and responsive host-guest systems.
  • The ability to induce and control helical chirality is a key feature of these systems.
  • Foldamer-based supramolecular architectures offer potential for advanced materials with dynamic and adaptive properties.