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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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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...
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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Dissociating stable nitrogen molecules under mild conditions by cyclic strain engineering.

Gao-Feng Han1, Xiang-Mei Shi2, Seok-Jin Kim1

  • 1School of Energy and Chemical Engineering/Center for Dimension-Controllable Organic Frameworks, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea.

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Summary

Researchers have found a new way to break apart nitrogen molecules (N2) using cyclic strain engineering under mild conditions. This discovery could enable easier synthesis of nitrogen-containing compounds.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Dissociating stable diatomic nitrogen molecules (N2) typically requires extreme high pressure and high temperature.
  • This limits the practical applications and energy efficiency of nitrogen fixation processes.

Purpose of the Study:

  • To investigate the dissociation of N2 under mild conditions using cyclic strain engineering.
  • To explore a novel method for activating and dissociating N2 that bypasses harsh reaction parameters.

Main Methods:

  • Application of cyclic strain engineering to diatomic nitrogen (N2).
  • Utilizing graphite as a receptor for dissociated nitrogen (N*).
  • Conducting reactions at pressures below 1 bar and temperatures around 40°C.

Main Results:

  • Successful dissociation of N2 under mild conditions (pressure < 1 bar, temperature ~40°C).
  • Achieved a high normalized loading of N to C (16.3 at/at %) using graphite as a receptor.
  • Demonstrated that cyclic strain alters nitrogen binding energy, facilitating adsorption and desorption.

Conclusions:

  • Cyclic strain engineering provides an efficient pathway for N2 dissociation at ambient conditions.
  • This method offers a low-energy alternative for nitrogen activation.
  • Potential for direct synthesis of nitrogen-containing compounds from N2 is significantly enhanced.