Estimation of Atmospheric Lifetimes of Hydrofluorocarbons, Hydrofluoroethers, and Olefins by Chlorine Photolysis Using Gas-Phase NMR Spectroscopy

An empirical correlation has been derived between accepted atmospheric lifetimes of a set of hydrofluorocarbons and hydrofluoroethers and relative rates of reaction with photolyzed chlorine in excess at ambient temperature. These kinetic systems were studied by nuclear magnetic resonance (NMR) spect...

Full description

Saved in:
Bibliographic Details
Published in:Analytical chemistry (Washington) 2008-08, Vol.80 (16), p.6317-6322
Main Authors: Marchione, Alexander A, Fagan, Paul J, Till, Eric J, Waterland, Robert L, LaMarca, Concetta
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An empirical correlation has been derived between accepted atmospheric lifetimes of a set of hydrofluorocarbons and hydrofluoroethers and relative rates of reaction with photolyzed chlorine in excess at ambient temperature. These kinetic systems were studied by nuclear magnetic resonance (NMR) spectroscopy in the gas phase, marking the first application of NMR spectroscopy to this field. The square of the Pearson coefficient R for the linear correlation between observed reaction rates and accepted atmospheric lifetimes was 0.87 for compounds of lifetime less than 20 years. The method was extended to the study of ethene and propene; the rate of reaction of propene was found to be 1.25 times that of ethene at 23 °C. The chief advantage of this method is its simplicity and reliance only on common tools and techniques of an industrial chemical laboratory.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac800883t