Photochemical Properties of CH2═CH-CFCl-CF2Br (4-Bromo-3-chloro-3,4,4-trifluoro-1-butene) and CH3-O-CH(CF3)2 (Methyl Hexafluoroisopropyl Ether): OH Reaction Rate Constants and UV and IR Absorption Spectra.

Rate constants for the reactions of hydroxyl radicals (OH) with 1,1,1,3,3,3-hexafluoroisopropyl methyl ether (CH3-O-CH(CF3)2) and 4-bromo-3-chloro-3,4,4-trifluoro-1-butene (CH2═CH-CFCl-CF2Br) have been measured over the temperature range 230-370 K to give the following Arrhenius expressions: kCH3OCH(CF3)2(T) = 7.69 × 10-14 × (T/298)2.99 × exp(+342/T), cm3 molecule-1 s-1, and kCH2CHCFClCF2Br(T) = (6.45 ± 0.72) × 10-13 × exp{+(424 ± 32)/T}, cm3 molecule-1 s-1. Atmospheric lifetimes of compounds were estimated to be 67 days and 4.5 days, respectively. UV absorption spectrum of CH2═CH-CFCl-CF2Br between 164 and 260 nm and IR absorption spectra of both compounds between 450 and 1600 cm-1 were measured at room temperature.

Citation

Vladimir L Orkin, Larissa E Martynova, Michael J Kurylo. Photochemical Properties of CH2═CH-CFCl-CF2Br (4-Bromo-3-chloro-3,4,4-trifluoro-1-butene) and CH3-O-CH(CF3)2 (Methyl Hexafluoroisopropyl Ether): OH Reaction Rate Constants and UV and IR Absorption Spectra. The journal of physical chemistry. A. 2017 Aug 03;121(30):5675-5680

PMID: 28683544

search → result