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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...
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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
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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’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...

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Microfluidic-based Synthesis of Covalent Organic Frameworks (COFs): A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Exceptional ammonia uptake by a covalent organic framework.

Christian J Doonan1, David J Tranchemontagne, T Grant Glover

  • 1Center for Reticular Chemistry at the California NanoSystems Institute, Department of Chemistry and Biochemistry, University of California-Los Angeles, Los Angeles, California 90095, USA.

Nature Chemistry
|December 3, 2010
PubMed
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Covalent organic frameworks (COFs) offer superior ammonia storage. COF-10 exhibits the highest uptake capacity among porous materials and maintains structural integrity through repeated adsorption-desorption cycles.

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Area of Science:

  • Materials Science
  • Chemistry

Background:

  • Covalent organic frameworks (COFs) are crystalline porous materials.
  • Many COFs possess Lewis acid boron sites ideal for adsorbing Lewis bases like ammonia.
  • Ammonia storage presents challenges due to its corrosive nature.

Purpose of the Study:

  • To evaluate COF-10 for ammonia storage applications.
  • To compare COF-10's ammonia uptake capacity with other porous materials.
  • To assess the stability and recyclability of COF-10 for ammonia adsorption.

Main Methods:

  • Synthesis and characterization of COF-10.
  • Ammonia adsorption/desorption experiments at specified conditions (298 K, 1 bar).
  • Comparison of ammonia uptake with zeolites (13X), ion-exchange resins (Amberlyst 15), and mesoporous silica (MCM-41).

Main Results:

  • COF-10 demonstrated the highest ammonia uptake capacity (15 mol kg⁻¹) compared to 13X zeolite (9 mol kg⁻¹), Amberlyst 15 (11 mol kg⁻¹), and MCM-41 (7.9 mol kg⁻¹).
  • Ammonia can be effectively removed from COF-10 via vacuum heating at 200°C.
  • Despite minor structural changes (reduced N₂ surface area), COF-10 maintained ammonia uptake capacity and structural integrity over multiple cycles.

Conclusions:

  • COF-10 is a highly effective material for ammonia storage, surpassing conventional materials.
  • The strong Lewis acid-base interactions in COF-10 ensure its stability and reusability for ammonia capture.
  • COF-10 shows significant promise for safe and efficient storage of corrosive chemicals like ammonia.