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FTIR investigation of the O-H···Xe interaction in simple carboxylic acids in solid xenon.

Authors
  • Ogruc Ildiz, Gulce
  • Nunes, Cláudio M
  • Kuş, Nihal
  • Fausto, Rui
Type
Published Article
Journal
The Journal of Chemical Physics
Publisher
American Institute of Physics
Publication Date
Aug 14, 2012
Volume
137
Issue
6
Pages
64309–64309
Identifiers
PMID: 22897275
Source
Medline
License
Unknown

Abstract

The O-H stretching region of the infrared spectra of a series of carboxylic acids in Xe matrices was investigated as a function of temperature. Upon increasing the temperature, the νO-H band site-components undergo reversible frequency blue-shifts, which are larger for the lowest-frequency components. This unprecedented observation indicates both that different types of O-H···Xe specific interactions occur, depending on different trapping sites, and the prevalence of stronger interactions of this type for molecules trapped in sites corresponding to lower frequency νO-H band site-components. These results are in agreement with previous investigations pointing to an increased stabilization and larger νO-H frequency red-shifts in carboxylic acid∕Xe complexes bearing a specific H-bond like O-H···Xe interaction. O-H···Xe interaction energies were obtained theoretically and also estimated from the spectroscopic data. Changes in the interaction energies upon temperature variation were also evaluated.

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