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Inorganic Nitrogen Assimilation01:22

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Pnictogen Interactions with Nitrogen Acceptors.

Binzhou Lin1, Hao Liu1, Ishwor Karki1

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA.

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|May 8, 2023
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Summary
This summary is machine-generated.

Nitrogen pnictogen bonds stabilize transition states, accelerating chemical reactions. These interactions, driven by electrostatics, show potential for catalysis and reaction design.

Keywords:
Molecular RotorsNitro-GroupsNon-Covalent InteractionSupramolecular Chemistryπ-Hole

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Computational Chemistry

Background:

  • Nitrogen pnictogen bonds are crucial non-covalent interactions.
  • Understanding their role in stabilizing transition states is key for reaction kinetics.

Purpose of the Study:

  • To quantify the strength and nature of stabilizing nitrogen pnictogen bond interactions.
  • To investigate the influence of these interactions on bond rotation barriers.
  • To explore the potential applications of nitrogen pnictogen interactions in catalysis.

Main Methods:

  • Utilized molecular rotors to study nitrogen pnictogen bond interactions.
  • Employed Exchange Spectroscopy Nuclear Magnetic Resonance (EXSY NMR) to measure rotation rates.
  • Performed Natural Bond Orbital (NBO) perturbation and electrostatic potential analyses.

Main Results:

  • Intramolecular C=O⋅⋅⋅N interactions were observed in transition states, lowering rotational barriers.
  • Pnictogen interaction energies strongly correlated with positive electrostatic potential on nitrogen, indicating a dominant electrostatic component.
  • Orbital-orbital contributions, assessed via NBO analysis, were found to be minor.
  • Observed C=O⋅⋅⋅N interactions were comparable to C=O⋅⋅⋅C=O and stronger than C=O⋅⋅⋅Ph interactions.

Conclusions:

  • Nitrogen pnictogen interactions significantly stabilize transition states, enhancing kinetic processes.
  • The electrostatic component is the primary driver of these stabilizing interactions.
  • These findings highlight the potential of nitrogen pnictogen interactions in designing catalytic systems and chemical reactions.