Theoretical studies of proton transfer in (CH3CHO-H-OCHCH3)+

Chih Hung Chu, Jia Jen Ho*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The geometric structures as well as the transfer of a proton in the complex of proton-bridged acetaldehyde dimer (CH3CHO)2H+ are studied theoretically by ab initio calculations. Four isomeric structures of the complex are found, and among them the cis-cis complex is calculated to be the most stable conformation. The energy difference between the least and the most stable conformation is less than 1 kcal/mol. A symmetric double well is found for proton transfer on the potential-energy hypersurface. A modified procedure was introduced while the energy barrier of proton transfer was calculated. With the transition structure fully optimized (allowing mutual movement of the two aldehyde moieties during proton transfer) the barrier is calculated to be 1.73 kcal/mol, significantly smaller than that (4.15 kcal/mol) calculated with a fixed distance between the two aldehyde subunits in the process of transfer. Each equilibrium structure in cis-cis and trans-trans conformations of (CH3CHO)2H+ has Cs symmetry with angular O-H-O, whereas the transition structure belongs to point group C2h. Comparison of these results with those of the formaldehyde cluster ion (HCHO)2H+ is also presented.

Original languageEnglish
Pages (from-to)1151-1155
Number of pages5
JournalJournal of physical chemistry
Issue number4
Publication statusPublished - 1995

ASJC Scopus subject areas

  • General Engineering
  • Physical and Theoretical Chemistry


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