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Related Concept Videos

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

2° Amines to N-Nitrosamines: Reaction with NaNO2

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.
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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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.
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

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A Polyaniline-based Sensor of Nucleic Acids
07:58

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Published on: November 1, 2016

Pyrene-functionalised, alternating copolyimide for sensing nitroaromatic compounds.

Stefano Burattini1, Howard M Colquhoun, Barnaby W Greenland

  • 1Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK.

Macromolecular Rapid Communications
|June 28, 2011
PubMed
Summary
This summary is machine-generated.

A novel copolymer detects volatile nitro aromatic compounds (NACs) through fluorescence quenching. Thin films of this pyrene-functionalized material offer rapid detection of compounds like TNT at room conditions.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Polymer Chemistry

Background:

  • Volatile nitro aromatic compounds (NACs) pose significant detection challenges.
  • Fluorescence-based sensing offers a sensitive method for detecting analytes.
  • Pyrene-functionalized materials are known for their photophysical properties.

Purpose of the Study:

  • To synthesize a novel pyrene-functionalized copolymer.
  • To evaluate the copolymer's potential for detecting volatile nitro aromatic compounds (NACs).
  • To investigate the sensing mechanism using spectroscopic techniques.

Main Methods:

  • Single-step synthesis of the copolymer via imidisation.
  • Characterization using proton nuclear magnetic resonance (¹H NMR), UV-vis, and fluorescence spectroscopy.
  • Fabrication of thin films for vapor-phase sensing experiments.

Main Results:

  • The synthesized copolymer successfully forms complexes with NACs in solution.
  • Significant fluorescence quenching observed in thin films upon exposure to 2,5-dinitrobenzonitrile vapor.
  • Detection occurs rapidly at ambient temperatures and pressures.

Conclusions:

  • The pyrene-functionalized copolymer is a promising material for sensitive NAC detection.
  • The fluorescence quenching mechanism enables effective vapor-phase sensing.
  • This material shows potential for applications in security and environmental monitoring.