193070-33-6Relevant academic research and scientific papers
A combined matrix isolation and ab initio study of bromine oxides
Galvez, Oscar,Zoermer, Anja,Loewenschuss, Aharon,Grothe, Hinrich
, p. 6472 - 6481 (2008/10/09)
Bromine oxides have been generated by passing a mixture of Br 2/O2/Ar through a microwave discharge. The products were stabilized at 6.5 K in an excess amount of argon. Infrared spectroscopy was used to analyze the species formed; experiments with enriched 18O 2 and ab initio calculations were carried out to assist in the assignment of the spectra. Besides the known species BrO, OBrO, and BrBrO, spectroscopic evidence for BrOBrO, BrBrO2, and a new isomer of Br2O3 is reported for the first time. Extensive comparisons are drawn between the present studies and previous experimental and theoretical works. The chemistry involved in the production of the observed compounds is discussed. The assignments are corroborated by the good correlation between observed and calculated band positions and intensities.
Kinetics and mechanisms of bromine chloride reactions with bromite and chlorite ions
Odeh, Ihab N.,Nicoson, Jeffrey S.,Huff Hartz, Kara E.,Margerum, Dale W.
, p. 7412 - 7420 (2008/10/09)
Chloride ion catalyzes the reactions of HOBr with bromite and chlorite ions in phosphate buffer (p[H+] 5 to 7). Bromine chloride is generated in situ in small equilibrium concentrations by the addition of excess Cl - to HOBr. In the BrCl/ClO2- reaction, where ClO2- is in excess, a first-order rate of formation of ClO2 is observed that depends on the HOBr concentration. The rate dependencies on ClO2-, Cl-, H+, and buffer concentrations are determined. In the BrCl/BrO2- reaction where BrCl is in pre-equilibrium with the excess species, HOBr, the loss of absorbance due to BrO2- is followed. The dependencies on Cl-, HOBr, H+, and HPO4 2- concentrations are determined for the BrCl/BrO2 - reaction. In the proposed mechanisms, the BrCl/ClO2 - and BrCl/BrO2- reactions proceed by Br + transfer to form steady-state levels of BrOClO and BrOBrO, respectively. The rate constant for the BrCl/ClO2- reaction (k2Cl) is 5.2 x 106 M-1 s-1 and for the BrCl/BrO2- reaction (k 2Br) is 1.9 × 105 M-1 s -1. In the BrCl/ClO2- case, BrOClO reacts with ClO2- to form two ClO2 radicals and Br -. However, the hydrolysis of BrOBrO in the BrCl/ BrO 2- reaction leads to the formation of BrO3 - and Br-.
