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NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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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...
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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Amperometry: Overview01:10

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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Physical Properties of Amines01:26

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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Amines to Sulfonamides: The Hinsberg Test01:23

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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.
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Light-Activated Sensitive Probes for Amine Detection.

Virginia Valderrey1, Aurelio Bonasera1, Sebastian Fredrich1

  • 1Institut für Chemie & IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany.

Angewandte Chemie (International Ed. in English)
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PubMed
Summary
This summary is machine-generated.

A new colorimetric method uses diarylethenes (DAEs) to rapidly detect primary and secondary amines. This sensitive technique allows for low-concentration detection in solution and gas phases, offering a simple and accurate amine detection solution.

Keywords:
aminesdiarylethenesphotochromismsensing

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Area of Science:

  • Analytical Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Amine detection is crucial in various fields, including environmental monitoring and diagnostics.
  • Existing methods for amine detection can be complex, time-consuming, or lack sensitivity.
  • Diarylethenes (DAEs) are photochromic compounds with potential applications in sensing.

Purpose of the Study:

  • To develop a simple, accurate, and rapid colorimetric method for detecting primary and secondary amines.
  • To utilize diarylethene-based probes for amine detection.
  • To achieve high sensitivity and selectivity in amine sensing.

Main Methods:

  • Synthesis of aldehyde- or ketone-substituted diarylethene probes.
  • Investigation of amine-induced decoloration reactions of DAE probes.
  • Light-induced activation and colorimetric detection of amines in solution.
  • Immobilization of DAE probes on paper for gas-phase amine detection.

Main Results:

  • The DAE probes exhibit a selective decoloration reaction upon exposure to primary and secondary amines, forming the ring-closed isomer.
  • The method allows for the detection of amines in solution at concentrations as low as 10-6 M.
  • Immobilized DAE probes on paper can detect biogenic amines, such as cadaverine, in the gas phase at concentrations above 12 ppbv within 30 seconds.

Conclusions:

  • The developed colorimetric method based on diarylethenes offers a rapid, simple, and accurate approach for detecting a wide range of primary and secondary amines.
  • The DAE probes demonstrate high sensitivity and selectivity, enabling detection in both solution and gas phases.
  • The paper-based sensing platform provides a practical and portable tool for on-site amine detection.