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Article
Hydrogen Bonding and Proton Transfer in the Ground and Lowest Excited Singlet States of o-Hydroxyacetophenone
The Journal of Physical Chemistry (1995)
  • M. V. Vener
  • Steve Scheiner, Utah State University
Abstract

The potential energy surface of the ground state and lowest lying singlet of o-hydroxyacetophenone was calculated at the ab initio SCF and CIS levels, respectively, using a split-valence basis set to which was added polarization functions on atoms involved in the intramolecular H-bond. Whereas these potentials each contain one minimum corresponding to the normal form and a second well for the proton-transferred tautomer, only one minimum appears in these potentials after correlation is added. SO - S1 excitation hence induces the tautomerization associated with intramolecular proton transfer from the hydroxyl to the carbonyl oxygen. The excited state proton transfer may involve a nonradiative transition from the Sl(nn*) state to Sl(nn*). The vibrational spectra of the two tautomers have certain strong differences. Anharmonic adiabatic treatment of the OH* 9 segment of the molecule leads to improved reproduction of experimentally observed v ( 0 9) and v(0H) frequencies.

Keywords
  • hydrogen bonding,
  • proton transfer,
  • ground,
  • lowest,
  • excited,
  • singlet,
  • states,
  • o-hydroxyacetophenone
Disciplines
Publication Date
January 1, 1995
Publisher Statement

Originally published by American Chemical Society in the Journal of Physical Chemistry.

Publisher's PDF can be accessed through the remote link. May require fee or subscription.

Citation Information
Hydrogen Bonding and Proton Transfer in the Ground and Lowest Excited Singlet States of o-Hydroxyacetophenone M.V. Vener, S. Scheiner J. Phys. Chem. 1995 99, 642-649.