Chemistry Journal of Moldova

PSEUDO JAHN-TELLER ORIGIN OF THE PROTON-TRANSFER ENERGY BARRIER IN THE HYDROGEN-BONDED [FHF]- SYSTEM

Author(s):

Natalia Gorinchoy, Iolanta Balan, Victor Polinger, Isaak Bersuker


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2021 Volume 16, no.1
Pages: 115-120
Keywords:

proton transfer, hydrogen bond, pseudo Jahn–Teller effect, potential energy surface, bifluoride anion.


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DOI: http://dx.doi.org/10.19261/cjm.2021.834

Abstract (PDF) 
Graphical Abstract: The results of ab initio calculations of the adiabatic potential energy surfaces for the proton-bound [FHF]- system at different F-F distances have been rationalized in the framework of the vibronic theory. It is shown that the instability of the symmetric D∞h structure at increased F∙∙∙F distances and the proton displacement to one of the fluorine atoms is due to the pseudo Jahn–Teller mixing of the ground 1Σg electronic state with the lowest excited state of 1Σu symmetry through the asymmetric σu vibrational mode.


 


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