Vibrational Spectroscopy of Perfluorocarboxylic Acids from the Infrared to the Visible Regions

We report here the gas-phase mid-IR, near-IR, and visible vibrational spectra of perfluoropropionic, perfluorooctanoic, and perfluorononanoic acids using Fourier transform and cavity ring-down spectroscopy. The impetus for this work was to provide insight into the behavior of environmentally persist...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2008-01, Vol.112 (2), p.276-282
Main Authors: Rontu, Nabilah, Vaida, Veronica
Format: Article
Language:English
Subjects:
Carboxylic Acids - chemistry
Fluorine Compounds - chemistry
Hydrogen - chemistry
Oxygen - chemistry
Spectrophotometry, Infrared
Temperature
Vibration
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Summary:We report here the gas-phase mid-IR, near-IR, and visible vibrational spectra of perfluoropropionic, perfluorooctanoic, and perfluorononanoic acids using Fourier transform and cavity ring-down spectroscopy. The impetus for this work was to provide insight into the behavior of environmentally persistent perfluorocarboxylic acids. Although the most intense transition for all three perfluorocarboxylic acids in the fundamental spectra is the CF3 stretch, the O−H stretch carries the most intensity in the overtone region. We record the O−H stretching transition frequencies and absorption cross-sections in the Δv OH = 1−5 regions. Our work suggests that perfluorocarboxylic acids have more harmonic O−H bonds, smaller transition frequencies, and smaller intensities as compared to shorter-chain hydrocarbon acids, alcohols, and peroxides.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0749773