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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.3K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.3K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

4.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
4.8K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.9K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.9K
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

8.2K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
8.2K
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

8.0K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
8.0K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.9K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.9K

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Investigating Anion-π Interactions In Ion-Pair Receptors Based On 3,5-Dinitrobenzoic Acid.

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Researchers developed novel supramolecular receptors that utilize anion-π interactions for enhanced ion-pair recognition. These electron-deficient systems show promising cooperative binding with sodium cations and bromide anions.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Anion-π interactions are a key noncovalent force in molecular recognition.
  • Designing receptors with electron-deficient aromatic systems is crucial for exploiting these interactions.
  • Cooperative recognition of ion pairs requires tailored molecular architectures.

Purpose of the Study:

  • To design, synthesize, and characterize novel supramolecular receptors capable of anion-π interactions.
  • To investigate the cooperative binding of ion pairs using these receptors.
  • To elucidate the role of electron-deficient aromatic systems and other functional groups in anion binding.

Main Methods:

  • Synthesis of supramolecular receptors incorporating electron-deficient aromatic scaffolds and cation-binding units.
  • 1H NMR titrations in acetonitrile to monitor binding affinities.
  • Quantum chemical calculations and electrostatic potential mapping to analyze interactions.

Main Results:

  • Receptors 1 and 3, with electron-poor aromatics and crown ether units, showed enhanced affinity for bromide anions in the presence of sodium cations.
  • Receptor 1 exhibited the most significant anion-π binding enhancement due to nitro-substituted rings and a macrocyclic cation-binding site.
  • Control receptor 2, lacking electron-withdrawing groups, displayed negligible anion affinity, confirming the importance of π-acidity.
  • Amide functionalities in receptors 3 and 4 improved binding affinity, demonstrating synergistic effects.

Conclusions:

  • Supramolecular receptors based on electron-deficient aromatic systems effectively engage in anion-π interactions for ion-pair recognition.
  • Cooperative binding of ion pairs can be achieved by combining anion-π interactions with cation-binding sites.
  • The findings provide a foundation for developing advanced ion-pair receptors with tailored recognition properties.