10097-32-2Relevant articles and documents
State-specific low temperature reactions of DBr+2 i(v+) + (D2, DBr) → D2Br+
Belikov, Andrey E.,Smith, Mark A.
, p. 57 - 63 (2002)
State-specific reactions of DBr+(2 i, v+) with D2 and DBr were studied in a low temperature free jet flow reactor. The selected spin-orbit and vibrational states of the DBr+ ion were prepared by resonance-enhanced multiphoton ionization. All of the reactant and product ions were monitored using time-of-flight mass spectrometry. Rate coefficients for the DBr+/DBr reaction are ～1.4 × 10-9 cm3 s-1 independent of the ion internal state, similar to those for the HBr+/HBr reaction. Rate coefficients of the DBr+/D2 reaction rise from 0 (lower spin-orbit-vibrational states) to 2 × 10-11 cm3 s-1 (highest energy states) and are observed to follow a mass independent threshold function similar to the HBr+/H2 reaction.
Kinetics of CN(X 2Σ+) radical reactions with HCN, BrCN and CH3CN
Zabarnick,Lin
, p. 185 - 191 (1989)
Absolute rate constants were obtained for CN (X 2Σ+) radical reactions with HCN, BrCN and CH3CN. The CN radical relative concentration was followed by laser-induced fluorescence (LIF) with a cw ring dye laser on the A 2Π-X 2Σ+ (4, 0) band at 621.5 nm. CN radicals were generated by laser photolysis of ICN at 266 nm. The following Arrhenius parameters were obtained over the temperature range 296-578 K: CN+HCN, k=10-11.41±0.15 exp[-(670±100)/T] cm3 s-1; CN+BrCN, k=10-10.7±0.4 × exp[-(1340±330)/T] cm3 s-1; CN+CH3CN, k=10-10.19±0.10 exp[-(1190±70)/T] cm3 s-1. The rates meas and that of Szekely et al. for CN+HCN could be well fitted by the form, k=10-16.20T1.57 exp (-50/T) cm3 s-1 over the range 300-3000 K, allowing extrapolation to the combustion temperature regime. The measured rates and those of Kayes and Levitt and Clark et al. for the CN+BrCN reaction could be fitted by the form, k=10-14.18T1.16 exp(-940/T) cm3 s-1 the temperature range 300-3000 K. In addition, the non-linearity of these data over a wide range of temperature could be satisfactorily accounted for by transition-state theory calculations for both of these reactions.
Electrochemistry of Br-/Br2 Redox Couple in Acetonitrile, Methanol and Mix Media of Acetonitrile-Methanol: An Insight into Redox Behavior of Bromide on Platinum (Pt) and Gold (Au) Electrode
Tariq, Muhammad
, p. 295 - 312 (2020)
Electro-oxidation of Br- on platinum and gold electrode was studied in acetonitrile, methanol and mix media of acetonitrile-methanol. The mechanism of Br- oxidation in these media was investigated using CV, Semi Integration Cyclic Vo
On the mechanism of the BrO+HBr reaction
Hansen, Jaron C.,Li, Yumin,Li, Zhuangjie,Francisco, Joseph S.
, p. 341 - 346 (1999)
The reaction of the bromine oxide radical, BrO, with HBr has been examined with coupled-cluster methods. The HO+HCl reaction is also examined and is used to calibrate the results for the BrO+HBr reaction. The heat of reaction and activation energy barrier
Dual-frequency oscillations induced by acidity in Belousov-Zhabotinskii reactions with aldosugars as substrates
Li, Hexing,Jin, Ronghua,Dai, Weilin,Deng, Jingfa
, p. 41 - 46 (1997)
Depending on the initial concentration of H2SO4, two types of dual-frequency oscillations have been observed in Belousov-Zhabotinskii type reactions catalyzed by Mn2+ with acetone and aldosugars (arabinose, glucose, galactose, lactose or maltose) as coupled substrates in a batch reactor. No such dual-frequency oscillations have been found when a ketosugar like fructose was used instead of an aldosugar as the substrate; or acetone was replaced by N2 flow. No oscillations were observed when Ce3+ was used instead of Mn2+. The reaction products of aldosugars in different oscillating regimes have been analyzed. The dual-frequency oscillatory patterns have been discussed according to the roles of the substrates and their derivatives formed at different acidity.
Experimental and theoretical determination of the magnetic dipole transition moment for the Br(4p5)(2P1/2←2P3/2) fine-structure transition and the quantum yield of Br(2P1/2) from the 193 nm photolysis of BrCN
He,Seth, Michael,Tokue,Macdonald, R. Glen
, p. 7821 - 7831 (1999)
The integrated-absorption coefficients of several hyperfine lines of the magnetic dipole allowed transition of the bromine atom, Br, center at 3685.2 cm-1 were measured, and a value for the square of the magnetic dipole transition moment of the Br atom was determined. A theoretical calculation for the magnetic dipole transition moment was also carried out using a relativistic ab initio atomic structure formulation. The theoretical value was in excellent agreement with the value predicted assuming pure LS coupling, and in reasonable agreement with experiment. The Br atom was generated in equal concentration with the cyano radical (CN) by the 193 nm photolysis of cyanogen bromine, BrCN. The CN radicals were titrated by the rapid reaction with C3H8 to generate HCN and a small amount of HNC. Both time-resolved and frequency-scanned infrared absorption spectroscopy were used to monitor the Br, HCN, and HNC species. The photolysis of BrCN at 193 nm produced both the ground state Br(2P3/2) and the spin-orbit excited Br(2P1/2) atoms, and the yield for the production of Br(2P1/2) atoms was measured to be 0.31±0.01. The rate constants for the quenching of Br(2P1/2) by BrCN and C3H8 at 293 K were also determined.
Pt embedded in carbon rods of N-doped CMK-3 as a highly active and stable catalyst for catalytic hydrogenation reduction of bromate
Li, Minghui,Hu, Yuan,Fu, Heyun,Qu, Xiaolei,Xu, Zhaoyi,Zheng, Shourong
, p. 11786 - 11789 (2019)
A novel Pt-based catalyst with fine and homogeneous Pt particles embedded in carbon rods of N-doped CMK-3 was fabricated by a two-step infiltration method using SBA-15 as the template. Due to its fine particle size, N-containing functionality and effective embedment of Pt particles in carbon rods, the catalyst exhibited superior catalytic activity and stability in the liquid phase catalytic hydrogenation of bromate in water.
Kinetics and Thermochemistry of the sec-C4H9 + HBr n-C4H10 + Br Equilibrium
Seetula, Jorma A.,Gutman, David
, p. 7529 - 7533 (1990)
The kinetics of the sec-C4H9 + HBr reaction was studied in a tubular reactor coupled to a photoionization mass spectrometer.The sec-C4H9 radicals were produced homogeneously in the reactor by pulsed UV laser photolysis.Radical decays in the presence of different HBr concentrations were monitored in time-resolved experiments.Rate constants were obtained as a function of temperature (229 - 533 K) and were fit to an Arrhenius expression: 1.7(+/-0.6)*10-12exp-1/RT> cm3 molecule-1 s-1.This kinetic information was combined with knowledge of the rate constant of the reverse reaction to obtain both the entropy -1 K-1> and heat of formation -1> of the sec-C4H9 radical at 298 K in a second law determination.The secondary C-H bond energy in n-C4H10 derived from this heat of formation is 411 (+/-3) kJ mol-1.This value is in excellent agreement with the secondary C-H bond energy in C3H8 determined previously both in an investigation of a comparable equilibrium involving HBr -1> and in investigations of dissociation-recombination equilibria involving i-C3H7 -1>.This study also provides a reconciliation of the formerly disparate sec-C4H9 heats of formation that were derived from studies of differnet kinds of chemical equilibria.
Kinetics of the Reactions of F- with CF3Br and CF3I as a Function of Temperature, Kinetic Energy, Internal Temperature, and Pressure
Morris, Robert A.,Viggiano, A. A.
, p. 3740 - 3746 (1994)
The reactions of F- with CF3Br and CF3I have been studied at several temperatures as functions of pressure and ion-neutral average center-of-mass kinetic energy (cm>).Rate constants and product branching fractions were measured by using a variable temperature-selected ion flow drift tube apparatus.Both title reactions involve two product pathway: displacement and association, the latter being the major channel under most experimental conditions.The rate constants for displacement are governed by total energy, regardless of the relative contributions by translational and internal energy, indicating that the displacement reactions behave statistically.In contrast, the rate constants for association depend strongly on the internal energy of CF3X (rotations and vibrations) compared with the relatively weak effect of translational collision energy.For CF3Br the rate constants for the association channel increase with increasing pressure while those for displacement are independent of pressure, indicating that the additional reactivity leading to more association at higher pressure appears not to compete with the displacement pathway.This lack of competition may be the result of two different reaction intermediates.The more efficient CF3I reaction is at or near the high-pressure limit for association, showing no pressure dependence in both the association and displacement channels.Therefore, there appears to be no competition between these channels for CF3I as well, but the data are less definitive in this case.
Temperature dependence of electron attachment to CH2ClBr: Competition between Cl- and Br- formation
Matejcik,Ipolyi,Illenberger
, p. 660 - 665 (2003)
Dissociative electron attachment (DEA) to CH2ClBr has been studied in a crossed electron/molecular beams experiment in the electron energy range between 0 and 2 eV and in the gas temperature range between 328 and 449 K. In this electron energy range we find the two negative fragment ions Cl- and Br- which are both formed from a prominent low energy resonant feature (≈0 eV). While the Br- ion yield (recorded at ≈0 eV) considerably increases with the temperature, that of Cl- slightly decreases resulting in an overall increase of ion formation at low electron energy. The temperature dependence is interpreted by the relative disposition of the involved potential energy surfaces. For the exothermic Br- channel an activation energy of 107 ± 10 meV for the DEA reaction is obtained. Using absolute rates from swarm data the total cross section for the DEA to CH2ClBr has been calibrated to absolute values leading to 5 × 10-21m2 at 0.5 eV.
