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Ab initio static and molecular dynamics study of 4-styrylpyridine.

Latévi M Lawson Daku1, Jorge Linares, Marie-Laure Boillot

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This study explores 4-styrylpyridine

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry
  • Organic Chemistry

Background:

  • 4-styrylpyridine isomers exhibit distinct electronic and structural properties.
  • Understanding molecular flexibility is crucial for predicting chemical behavior.

Purpose of the Study:

  • To conduct an in-depth theoretical investigation of 4-styrylpyridine's ground state.
  • To analyze the geometries, stabilities, and isomerization pathways of its trans and cis isomers.

Main Methods:

  • Density Functional Theory (DFT) with B3LYP and PBE functionals.
  • High-level ab initio methods including Hartree-Fock (HF), Møller-Plesset perturbation theory (MP2), and Coupled Cluster (CC) theories.
  • Car-Parrinello molecular dynamics simulations at various temperatures.

Main Results:

  • Trans conformation predicted as planar and more stable; cis conformation is twisted and higher in energy.
  • Identified transition states for cis-trans isomerization, cis enantiomerization, and group rotations.
  • Molecular dynamics revealed significant flexibility, with the trans isomer being nonplanar at finite temperatures.

Conclusions:

  • Theoretical calculations accurately predict 4-styrylpyridine's structural and energetic landscape.
  • The molecule exhibits considerable flexibility, influencing its conformational preferences at different temperatures.
  • Computational methods provide valuable insights into isomerization dynamics and transition states.