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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

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

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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...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

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

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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.
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Diazonium Group Substitution: –OH and –H01:19

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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.
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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Urea Metal-Organic Frameworks for Nitro-Substituted Compounds Sensing.

Alireza Azhdari Tehrani1, Leili Esrafili1, Sedigheh Abedi1

  • 1Department of Chemistry, Faculty of Sciences, Tarbiat Modares University , P.O. Box 14115-175, Tehran, Iran.

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Researchers developed new urea-functionalized metal-organic frameworks (MOFs) for detecting nitro-analytes. The study highlights the crucial role of urea group orientation and interpenetration in MOF sensor performance.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Chemical Sensing

Background:

  • Urea groups are effective hydrogen bond donors and acceptors, making them suitable for designing molecular receptors.
  • Metal-organic frameworks (MOFs) offer tunable porous structures for host-guest chemistry and sensing applications.
  • Nitro-substituted compounds are important analytes in various fields, necessitating sensitive detection methods.

Purpose of the Study:

  • To synthesize and characterize novel urea-functionalized pillared metal-organic frameworks (MOFs).
  • To investigate and compare the sensing capabilities of these MOFs towards nitro-analytes.
  • To elucidate the influence of urea group orientation and network interpenetration on sensing performance.

Main Methods:

  • Synthesis of two distinct pillared MOFs incorporating urea functional groups.
  • Structural characterization using techniques such as X-ray diffraction.
  • Evaluation of sensing properties through interaction studies with various nitro-analytes.

Main Results:

  • Successful synthesis and structural confirmation of two urea-functionalized MOFs.
  • Demonstration of MOF sensing capabilities for nitro-analytes.
  • Identification of urea group orientation and supramolecular interpenetration as key factors influencing sensing efficiency.

Conclusions:

  • Urea-functionalized MOFs represent a promising platform for nitro-analyte recognition.
  • The precise arrangement of urea groups within MOF pores significantly impacts sensor performance.
  • This study presents the first example of urea-functionalized MOFs for selective nitro-analyte detection.