Hydrogen bonding and dissociation effects on the gas phase proton transfer reactions of ozone

R. Contreras, V. S. Safont, J. Andrés, P. Pérez, A. Aizman, O. Tapia

Research output: Contribution to journalLetterpeer-review

3 Citations (Scopus)


Recently, the proton affinity (PA) of ozone was experimentally determined by Cacace and Speranza [Science (1994) 265: 208] using a bracketing technique that involved the proton transfer (PT) reactions: O3H++B⟹ O3. BH+; for different Brönsted bases B. These authors showed that the simple collision model is not adequate to describe PT. We now present a theoretical model reflecting this bracketing procedure by explicitly introducing H-bonding complexing, dissociation and PT contributions, to discuss the kinetic model that assumes that PT occurs through one elementary step. The methods used include semiempirical density functional theory and ab initio Hartree-Fock methods. The procedure is gauged by using estimated PA of ozone obtained from deprotonation reactions including the Brönsted bases B=NH3, H2O, HOCl, SO2, CH3F and Kr. The PA-obtained range was from 145.3 to 160.3 kcal/mol, in fair agreement with the experimental value of 148:0 ± 3 kcal/mol. The model seems to be fairly independent of the reference bases used to evaluate the PA. H-bonding effects appear to be a determining factor to explain collision efficiencies.

Original languageEnglish
Article numberA060
Pages (from-to)60-63
Number of pages4
JournalTheoretical Chemistry Accounts
Issue number1
Publication statusPublished - 1998


  • Dissociation effects
  • Gas phase proton transfer reactions
  • H-bonding effects

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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