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Related Concept Videos

NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...
Amines to Sulfonamides: The Hinsberg Test01:23

Amines to Sulfonamides: The Hinsberg Test

The Hinsberg test is a method to identify primary, secondary and tertiary amines, named after its pioneer, Oscar Hinsberg. Here, amines are treated with benzenesulfonyl chloride, also known as the Hinsberg reagent, in the presence of an excess of aqueous base, followed by acidification. Based on the nature of the amines, different changes are observed.
Generally, a primary amine reacts with the Hinsberg reagent to produce an N-substituted benzenesulfonamide. The electron-withdrawing sulfonyl...

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Related Experiment Video

Updated: Jun 19, 2026

A Polyaniline-based Sensor of Nucleic Acids
07:58

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

A highly selective optical sensor for aniline recognition.

Liming Zhang1, Bin Li

  • 1Key Laboratory of Excited State Processes, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|October 17, 2009
PubMed
Summary
This summary is machine-generated.

A novel optical sensor, 2,6-bis(2-benzimidazolyl)pyridine, demonstrates high selectivity for aniline detection. Its unique spectral response and linear emission intensity correlation with aniline concentration show promise for practical optical sensing applications.

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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Last Updated: Jun 19, 2026

A Polyaniline-based Sensor of Nucleic Acids
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
09:46

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

Area of Science:

  • Analytical Chemistry
  • Materials Science

Background:

  • Aniline detection is crucial in environmental and industrial monitoring.
  • Development of selective and sensitive sensors is an ongoing challenge.

Purpose of the Study:

  • To report a novel optical sensor for selective aniline recognition.
  • To investigate the spectral properties and quantitative response of the sensor to aniline.

Main Methods:

  • Synthesis and characterization of 2,6-bis(2-benzimidazolyl)pyridine.
  • Spectroscopic analysis of the sensor's response to varying aniline concentrations.

Main Results:

  • The sensor exhibits high selectivity towards aniline.
  • A unique spectral response was observed.
  • A linear relationship between emission intensity and aniline concentration was established.

Conclusions:

  • 2,6-bis(2-benzimidazolyl)pyridine is a promising candidate for optical aniline sensors.
  • The sensor's selectivity and quantitative response support its practical application in aniline recognition.