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Krusic PJ, Marchione AA, Davidson F, et al. Vapor pressure and intramolecular hydrogen bonding in fluorotelomer alcohols. J Phys Chem A. 2005;109(28):6232-41doi: 10.1021/jp0502961.
Krusic, P. J., Marchione, A. A., Davidson, F., Kaiser, M. A., Kao, C. P., Richardson, R. E., Botelho, M., Waterland, R. L., & Buck, R. C. (2005). Vapor pressure and intramolecular hydrogen bonding in fluorotelomer alcohols. The journal of physical chemistry. A, 109(28), 6232-41. https://doi.org/10.1021/jp0502961
Krusic, Paul J, et al. "Vapor pressure and intramolecular hydrogen bonding in fluorotelomer alcohols." The journal of physical chemistry. A vol. 109,28 (2005): 6232-41. doi: https://doi.org/10.1021/jp0502961
Krusic PJ, Marchione AA, Davidson F, Kaiser MA, Kao CP, Richardson RE, Botelho M, Waterland RL, Buck RC. Vapor pressure and intramolecular hydrogen bonding in fluorotelomer alcohols. J Phys Chem A. 2005 Jul 21;109(28):6232-41. doi: 10.1021/jp0502961. PMID: 16833963.
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J Phys Chem A. 2005 Jul 21;109(28):6232-41. doi: 10.1021/jp0502961.

Vapor pressure and intramolecular hydrogen bonding in fluorotelomer alcohols.

The journal of physical chemistry. A

Paul J Krusic, Alexander A Marchione, Fredric Davidson, Mary A Kaiser, Chien-Ping C Kao, Raymond E Richardson, Miguel Botelho, Robert L Waterland, Robert C Buck

Affiliations

  1. DuPont Corporate Center for Analytical Sciences, Central Research and Development, Experimental Station, Wilmington, Delaware 19880, USA.

PMID: 16833963 DOI: 10.1021/jp0502961

Abstract

Vapor pressure and aqueous solubility are important parameters used to estimate the potential for transport of chemical substances in the atmosphere. For fluorotelomer alcohols (FTOHs), currently under scrutiny by environmental scientists as potential precursors of persistent perfluorocarboxylates (PFCAs), vapor pressure is the more significant property since these compounds are only very sparingly soluble in water. We have measured the vapor pressures of a homologous series of fluorotelomer alcohols, F(CF2CF2)nCH2CH2OH (n = 2-5), in the temperature range 21-250 degrees C by three independent methods: (a) a method suitable for very low vapor pressures at ambient temperatures (gas-saturation method), (b) an improved boiling point method at controlled pressures (Scott method), and (c) a novel method, requiring milligram quantities of substance, based on gas-phase NMR, a technique largely unfamiliar to chemists and holding promise for studies of relevance to environmental chemistry. The concordant values obtained indicate that recently published vapor pressure data overestimate the vapor pressure at ambient temperature, and therefore the volatility, of this series of fluorinated compounds. It was suggested that substantial intramolecular -O-H...F- hydrogen bonding between the hydroxylic proton and the two fluorines next to the ethanol moiety was responsible for their putative high volatility. Therefore, we have used gas-phase NMR, gas-phase FTIR, 2D NMR heteronuclear Overhauser effect measurements, and high-level ab initio computations to investigate the intramolecular hydrogen bonding in fluorotelomer alcohols. Our studies unequivocally show that hydrogen bonding of this type is not significant and cannot contribute to and cause unusual volatility. The substantially lower vapor pressure at ambient temperatures than previously reported resulting from our work is important in developing a valid understanding of the environmental transport behavior of this class of compounds.

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