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The Se-N dynamic covalent bond, crucial for self-healing materials, forms through reversible interactions between selenium and nitrogen atoms. Substituent groups on pyridine influence this bond's formation and stability.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Computational Chemistry

Background:

  • Se-N dynamic covalent bonds are essential for creating advanced functional materials like those that are stimuli-responsive and self-healing.
  • While experimental progress has been made, the fundamental mechanism governing the formation of Se-N dynamic covalent bonds remains largely unexplored.

Purpose of the Study:

  • To elucidate the formation mechanism of the Se-N dynamic covalent bond.
  • To investigate the influence of pyridine substituents on the Se-N bond's structural dynamics and nature.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to analyze the interactions.
  • The study examined three pyridine derivatives (pyridine, 4-methylpyridine, 4-dimethylamino-pyridine) reacting with phenylselenyl bromide (PhSeBr).
  • Computational models explored dissociation, nonbonding, and covalent bond interactions between Se and N atoms.

Main Results:

  • The interactions between Se and N atoms can exist in three interconvertible states: dissociation, nonbonding, and covalent.
  • These interconversions facilitate the dynamic nature of the Se-N covalent bond.
  • Polar solvents, such as CH2Cl2, promote the conversion between covalent and nonbonding Se-N interactions.
  • Electron-donating substituents on the pyridine ring enhance the ease of structural transformation, thereby influencing bond dynamics.

Conclusions:

  • The Se-N dynamic covalent bond formation is a result of the mutual conversion between dissociation, nonbonding, and covalent interaction models.
  • Solvent polarity and the electronic properties of pyridine substituents significantly modulate the dynamics of Se-N bond formation and stability.
  • This research provides crucial insights into the mechanism of Se-N dynamic covalent bonds, paving the way for designing novel functional materials.