Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Gas Phase Proton Affinity, Basicity, and pKa Values for Nitrogen Containing Heterocyclic Aromatic Compounds

  • Hwang, Sun-Gu (School of Free Major, Miryang National University) ;
  • Jang, Yun-Hee (School of Chemistry, NS60, Seoul National University) ;
  • Chung, Doo-Soo (School of Chemistry, NS60, Seoul National University)
  • Published : 2005.04.20
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Abstract

Bipyridine and its derivatives have been widely used as the ligands in transition metal complexes. The proton affinities of pyridine derivatives were calculated using an ab initio quantum mechanical method (B3LYP with various double zeta and triple zeta basis sets) in combination with the Poisson-Boltzmann continuum solvation model. Van der Waals radii of the atoms in the heterocyclic rings for the solvation energy calculation were set to values determined to reproduce the $pK_a$ values of guanine and oxoguanine derivatives and that of chlorine was optimized to reproduce the experimental values of relating compounds. The $pK_a$ values for the heterocyclic ring compounds were in agreement with the experimental values with a mean unsigned error of 0.45 $pK_a$ units.

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References

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