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Electron transfer in pnicogen bonds.

Liangyu Guan1, Yirong Mo

  • 1Department of Chemistry, Western Michigan University , Kalamazoo, Michigan 49008, United States.

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Summary
This summary is machine-generated.

Pnicogen bonds, a type of noncovalent interaction, involve VA group elements. This study uses the block-localized wave function (BLW) method to analyze bonding in substituted phosphines, revealing electron transfer and polarization energies as key factors.

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Area of Science:

  • * Computational Chemistry
  • * Chemical Bonding Theory
  • * Noncovalent Interactions

Background:

  • * Pnicogen bonds, a recently recognized class of noncovalent interactions, involve VA group elements (N, P, As) acting as electrophiles.
  • * These interactions are crucial for understanding molecular recognition and crystal engineering.
  • * Previous studies often assumed specific electron transfer pathways in pnicogen bonding.

Purpose of the Study:

  • * To investigate the nature of pnicogen bonding in substituted phosphines (X(n)PH(3-n)) complexed with ammonia.
  • * To quantify the contributions of different energy components to the pnicogen bond strength.
  • * To explore novel electron transfer pathways beyond traditional hyperconjugation.

Main Methods:

  • * Utilized the block-localized wave function (BLW) based energy decomposition scheme.
  • * Employed BLW to derive optimal monomer orbitals, effectively quenching electron transfer for analysis.
  • * Analyzed HOMO-LUMO interactions and electron density difference (EDD) maps.

Main Results:

  • * Electron transfer and polarization energies were identified as dominant contributors to pnicogen bond energy.
  • * A novel n → dπ* electron transfer pathway was observed for nitro (NO2) and cyano (CN) substituted phosphines.
  • * EDD maps indicated electron density accumulation on the phosphorus atom, supporting the σ-hole concept.

Conclusions:

  • * The study elucidates the complex electronic structure of pnicogen bonds in substituted phosphines.
  • * Identified a new n → dπ* interaction pathway, expanding the understanding of electron transfer mechanisms.
  • * Results reinforce the σ-hole model as a descriptor for pnicogen bonding, supported by EDD analysis.