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Updated: Jun 25, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Published on: October 18, 2019

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高性能三甲基胺传感器 基于一个二甲基共价有机框架

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
概括

研究人员使用共价有机框架 (COF) 开发了一种新的三甲基胺 (TMA) 传感器,该传感器在室温下有效运行. 这种新型的TB-COF传感器为实时TMA监控提供了高灵敏度和低检测极限.

关键词:
这就是COFs.气体传感传感器是指气体传感器.实时监控实时监控在室温室温.三甲基胺胺的三甲基胺.

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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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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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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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