17610-65-0

Upstream product

• 677-56-5 1,1,1,2,2,3-hexafluoropropane 
• 354-33-6 1,1,1,2,2-pentafluoroethane 

Relevant academic research and scientific papers

Atmospheric Chemistry of HFC-236cb: Spectrokinetic Investigation of the CF3CF2CFHO2 Radical, Its Reaction with NO and NO2, and the Fate of the CF3CF2CFHO Radical

A pulse radiolysis technique was used to study the UV absorption spectrum of CF3CF2CFHO2 radicals (at 250 nm ? = (175 +/- 36) x 10-20 cm2 molecule-1).The observed bimolecular rate constant for the self reaction of CF3CF2CFHO2 radicals was k13obs = (5.2 +/- 1.4) x 10-12 cm3 molecule-1 s-1.Rate constants for reactions of CF3CF2CFHO2 radicals with NO and NO2 were k3 > 8 x 10-12 and k4 = (6.3 +/- 0.7) x 10-12 cm3 molecule-1 s-1, respectively.Using a FTIR spectrometer/smog chamber technique it was shown that, under atmospheric conditions, reaction with O2 and decomposition via C-C bond scission are competing loss mechanisms for CF3CF2CFHO radicals.A lower limit of 105 s-1 was deduced for the rate of decomposition of CF3CF2CFHO radicals via C-C bond scission at 296K in 1 bar of SF6 diluent.It is estimated that in the atmosphere approximately 98percent of CF3CF2CFHO radicals will undergo decomposition into C2F5 radicals and HC(O)F and 2percent will react with O2 to give C2F5C(O)F.As part of this work relative rate methods were used to measure rate constants of (1.3 +/- 0.3) x 10-12 and (1.5 +/- 0.3) x 10-15 cm3 molecule-1 s-1 for the reactions of CF3CF2CFH2 with F and Cl atoms, respectively.

Fluorine-atom initiated oxidation of CF3CF2H (HFC-125) studied by FTIR spectroscopy: Product yields and kinetic modelling

A comprehensive study has been carried out of the oxidation of CF3CF2H (HFC-125). Reaction was initiated by continuous photolysis of F2 in the near-UV. The F atoms produced abstracted a hydrogen atom from CF3CF2H initiating oxidation in gas mixtures containing variable amounts of O2 and made up to a total pressure of 700 Torr with N2. Product yields were measured as a function of time using FTIR spectroscopy. Experiments were performed at room temperature and in mixtures containing different ratios of [F2] to [CF3CF2H]. The major products were COF2, CF3O3CF3 and CF3O3C2F5, consistent with C-C bond scission being the dominant loss process for CF3CF2O radicals and with previous studies which used chlorine atoms to initiate oxidation. Attempts to match the experimental results with predictions using the FACSIMILE chemical modelling program were moderately successful and confirmed recent results regarding the equilibrium constant for: F + O2(+M) = FO2(+M).

UV absorption spectrum, and kinetics and mechanism of the self reaction of CF3CF2O2 radicals in the gas phase at 295 K

The ultraviolet absorption spectrum, kinetics and mechanism of the self reaction of CF3CF2O2 radicals have been studied in the gas phase at 295 K. Two techniques were used; pulse radiolysis UV absorption to measure the spectrum and kinetics, and long-path length FTIR spectroscopy to identify and quantify the reaction products. Absorption cross sections were quantified over the wavelength range 220-270 nm. At 230 nm, ΣCF3CF2O2 =(2.74±0.46)×10-18 cm2 molecule-1. The observed products following the self reaction of CF3CF2O2 radicals were COF2CF3O3CF3, CF3O3C2F5, and CF3OH. CF3O2CF3 was tentatively identified as a product. The carbon balance was 90-100%. The self reaction of CF3CF2O2 radicals was found to proceed via one channel to produce CF3CF2O radicals which then decompose to give CF3 radicals and COF2. In the presence of O2, CF3 radicals are converted into CF3O radicals. CF3O radicals have several fates; self reaction to give CF3O2CF3; reaction with CF3O2 radicals to give CF3O3CF3; reaction with C2F5O2 radicals to give CF3O3C2F5; or reaction with CF3CF2H to give CF3OH. As part of this work a rate constant (2.5±0.6)×10-16 cm3 molecule-s- was measured for the reaction of Cl atoms with CF3CHF2 using a relative rate technique. Results are discussed with respect to the atmospheric chemistry of CF3CF2H(HFC-125).