28882-09-9

Basic information

• Product Name: Bromodifluoromethyl radical
• Synonyms: Bromodifluoromethyl radical
• CAS NO: 28882-09-9
• Molecular Formula: CBrF₂
• Molecular Weight: 129.9115064
• Mol File: 28882-09-9.mol
• Article Data: 8

Chemical Properties

• Boiling Point: °Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: g/cm³
• CAS DataBase Reference: Bromodifluoromethyl radical(CAS DataBase Reference)
• NIST Chemistry Reference: Bromodifluoromethyl radical(28882-09-9)
• EPA Substance Registry System: Bromodifluoromethyl radical(28882-09-9)

Safety Data

• Hazardous Substances Data: 28882-09-9(Hazardous Substances Data)

Usage

InChI:InChI=1/CBrF2/c2-1(3)4

Upstream product

• 75-63-8 Bromotrifluoromethane 
• 54250-40-7 difluoro carbene⁽¹⁺⁾ 
• 75-61-6 dibromodifluoromethane 
• 1511-62-2 bromodifluoromethane 

Downstream Products

• 124-73-2 1,2-dibromo-1,1,2,2-tetrafluoroethane 
• 75-61-6 dibromodifluoromethane 

Relevant articles and documents

Laser (248 nm) flash photolysis and pulse radiolysis of CF2Br2 in aqueous solution: Atmospheric implications

Henry's law constant (Kh) of CF2Br2 was measured to be 0.058 M atm-1 at room temperature. The steady state as well as laser (248 nm) flash photolysis of CF2Br2 was carried out in aqueous solution. The formation of Br2.- radicals involving two primary photodissociation channels was observed in the flash photolysis. One channel produced CF2Br. and Br. radicals, and the other led to the formation of Br- and H+. The spectrum and reactions of CF2Br. were studied in aqueous solution by pulse radiolysis. The CF2Br. radical was found to absorb in the 230-270 nm region with a molar absorbance (ε) of 710 M-1 cm-1 at λmax = 245 nm. The rate constants of some of the reactions were measured at 299 K as follows: k (eaq- + CF2Br2) = 1.20 ± 0.13 × 1010, 2κ (CF2Br. + CF2Br.) = 1.4 ± 0.4 × 109, κ(CF2Br. + O2) = 1.9 ± 0.5 × 109 M-1 s-1. The CF2BrO2. radical absorbed in the 245-360 nm region with ε = 593 M-1 cm-1 at λmax = 265 nm. An apparatus used to measure Kh, and a closed-loop flow system used to carry out the flash photolysis/pulse radiolysis of sparingly soluble gases, like CF2Br2, are reported.

Measuring the rate constant of the reaction between chlorine atoms and CHF2Br by Cl atom resonance fluorescence

The rate constant of the reaction between Cl atoms and CHF2Br has been measured by chlorine atom resonance fluorescence in a flow reactor at temperatures of 295–368 K and a pressure of ~1.5 Torr. Lining the inner surface of the reactor with F-32L fluoroplastic makes the rate of the heterogeneous loss of chlorine atoms very low (khet ≤ 5 s–1). The rate constant of the reaction is given by the formula k = (4.23 ± 0.13) × 10–12e(–15.56 ± 1.58)/RT cm3 molecule–1 s–1 (with the activation energy in kJ/mol units). The possible role of this reaction in the extinguishing of fires producing high concentrations of chlorine atoms is discussed.

Equilibrium and Rate Constants of the Reactions RBr ? R + Br and Br + RBr ? Br2 + R (R = CH2Cl, CHCl2, CCl3, and CBrF2) at 300-700°C

The equilibrium (Ke,l = k1/k-1) and rate constants of the reactions RBr k5?k-5 R + Br and Br + RBr k2?k-2 R + Br2 (R = R = CH2Cl, CHCl2, CCl3, and CBrF2) at 500-700°C are determined by the method of isothermal pyrolysis of the bromides CH2BrCl, CHBrCl2, CBrCl3, and CBr2F2. In all cases the use of the theoretical point Ke,5 (T = ∞) = A5 allowed more precise determination of Δ00 = ED(R-Br) than in all previous studies.