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Related Concept Videos

Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
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Mass Spectrometry of Amines01:19

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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule: a molecule with an odd number of nitrogen atoms produces a parent ion with an odd molecular weight. The remaining fragments have an even mass.
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...
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Structure of Amines01:19

Structure of Amines

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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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High-Performance Trimethylamine Sensor Based on an Imine Covalent Organic Framework.

Weiyu Zhang1,2,3, Qihua Sun1,2, Yuqing Zhu2

  • 1School of Physics Science and Technology, Xinjiang University, Urumqi, Xinjiang 830046, China.

ACS Sensors
|May 29, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new trimethylamine (TMA) sensor using covalent organic frameworks (COFs) that operates effectively at room temperature. This novel TB-COF sensor offers high sensitivity and a low detection limit for real-time TMA monitoring.

Keywords:
COFsgas sensingreal-time monitoringroom temperaturetrimethylamine

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Trimethylamine (TMA) is prevalent in agriculture and industry, posing significant health risks via inhalation.
  • Existing TMA gas sensors often require high temperatures, limiting practical applications and market viability.
  • There is a need for sensitive, room-temperature sensors for real-time TMA detection.

Purpose of the Study:

  • To synthesize and characterize imine covalent organic frameworks (TB-COF) for gas sensing applications.
  • To develop and evaluate room-temperature gas sensors based on TB-COF for TMA detection.
  • To assess the sensitivity, selectivity, and performance limits of the TB-COF sensor.

Main Methods:

  • Synthesized TB-COF using 1,3,5-tris(4-aminophenyl)benzene (TAPB) and 1,3,5-benzotricarboxaldehyde (BTCA) with acetic acid catalyst at room temperature.
  • Fabricated three gas sensors: TA, BT, and TB-COF.
  • Tested sensor performance against 15 different gases at room temperature, focusing on TMA sensitivity and response time.

Main Results:

  • The TB-COF sensor exhibited significantly higher sensitivity to TMA (6845.9% at 500 ppm) compared to TA and BT sensors.
  • Achieved a low detection limit of 28.6 ppb for TMA with rapid adsorption/desorption cycles (23 s).
  • Demonstrated superior performance of TB-COF over individual components for TMA sensing.

Conclusions:

  • Room-temperature synthesized TB-COF is a promising material for sensitive and real-time TMA gas sensing.
  • The developed sensor addresses the limitations of high-temperature detection methods.
  • Covalent organic frameworks (COFs) show great potential for advanced gas sensor development.