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C:Corrosive;10035-10-6Relevant articles and documents
Complexes Containing a Phenol–Platinum(II) Hydrogen Bond: Synthons for Supramolecular Self-Assembly and Precursors for Hydridoplatinum(IV) Complexes
Behnia, Ava,Fard, Mahmood Azizpoor,Boyle, Paul D.,Puddephatt, Richard J.
, p. 2899 - 2906 (2019)
The cycloneophylplatinum(II) complexes [Pt(CH2CMe2C6H4)(κ2-NN′-2-C5H4NCH2-NH-R], R = 2-C6H4OH, 1; R = 3-C6H4OH, 2; R = 4-C6H4OH, 3, and [Pt(CH2CMe2C6H4)(κ2-NN′-2-C5H4NCH=N-2-C6H4OH)], 4, are reported. The structures of 1 and 4 each contain an intramolecular OH··Pt hydrogen bond, while complex 3 contains an intermolecular OH··Pt hydrogen bond and forms a new type of supramolecular polymer. In contrast, the complex [PtCl2(κ2-NN′-2-C5H4NCH=N-2-C6H4OH)], 5, forms a dimer through intermolecular OH··ClPt hydrogen bonding. Reaction of complex 4 with HCl or HBr occurs by oxidative addition to give hydridoplatinum(IV) complexes [PtHX(CH2CMe2C6H4)(κ2-NN′-2-C5H4NCH=N-2-C6H4OH)], 6, X = Cl; 7, X = Br. The sequential formation of isomers of these compounds is interpreted in terms of a proposed reaction mechanism.
Superacidic or not...? Synthesis, characterisation, and acidity of the room-temperature ionic liquid [C(CH3)3]+ [Al2Br7]-
Scholz, Franziska,Himmel, Daniel,Scherer, Harald,Krossing, Ingo
, p. 109 - 116 (2013)
The room-temperature ionic liquid (RT-IL) [C(CH3) 3]+ [Al2Br7]- (m.p. 2 °C) was generated by bromide abstraction from tert-butyl bromide with the Lewis acid aluminum bromide in the absence of solvent. The crystal structure of the tert-butyl cation salt was determined by X-ray diffraction. NMR, IR, and Raman spectroscopy, as well as quantum-chemical and thermodynamic calculations, confirm the composition of this RT-IL. Thus, one may consider this RT-IL to be a readily accessible (and on a large scale) cationic Bronsted acid (protonated isobutene) with the potential for further reactivity. Based on the new absolute Bronsted acidity scale, we calculated an absolute pH abs value of 171 for liquid bulk [C(CH3)3] + [Al2Br7]-. This value is about as acidic as 100 % sulfuric acid (pHabs=171) and, thus, on the edge of superacidity.
Influence of Si surface structure on reaction mechanism: Atomic hydrogen + adsorbed Br
Koleske, D. D.,Gates, S. M.
, p. 5091 - 5094 (1993)
The reaction of atomic hydrogen with adsorbed Br is compared on Si(100) and Si(111) surfaces from 50 deg C to 300 deg C.On both surfaces, Br removal rate is first order in atomic hydrogen flux, first-order in Br coverage, and exhibits a near zero activation energy.On Si(111), this rate also depends on surface hydrogen coverage, indicating that different mechanisms occur on these surfaces.
Theoretical and experimental studies for preparing 1, 1-dibromo-1,2,2,2-tetrafluoroethane on gas-phase bromination of 1,1,1,2-tetrafluoroethane
Hu, Ruzhu,Zhang, Chengping,Qing, Feiyao,Quan, Hengdao
, p. 91 - 95 (2016)
Efficient gas-phase bromination of 1, 1, 1, 2-tetrafluoroethane (HFC-134a) for the preparation of 1, 1-dibromo-1, 2, 2, 2-tetrafluoroethane (CF3CFBr2) has been described for the first time. A wide-ranging experimental investigation o
Low-temperature Kinetics of the Charge- and Atom-Transfer Reactions (Br+, HBr+ [2∏i, ν+, DBr+ [2∏i, ν+]) + (HBr, DBr) → (HBr+, DBr+, H2Br +, D2Br+, HDBr+)
Belikov, Andrey E.,Smith, Mark A.
, p. 3447 - 3456 (2004)
The charge- and atom-transfer reactions between Br+, HBr +, and DBr+ ions and HBr and DBr molecules have been studied in a HBr + DBr + He free jet. The ionic reactants in specific internal states were prepared by resonance multiphoton ionization of either HBr or DBr, and the ionic products were analyzed by mass spectrometry. A set of eight energetically possible reactions was considered in each case, including ions born in near-resonant ionization and photodissociation processes. Kinetic equations were integrated numerically over the appropriate reaction time and an optimization problem was solved to determine rate coefficients fit to final fractions of all ions measured in an experiment. Analytical expressions for the final fractions also were obtained and were used to derive the rate coefficients more accurately. The work is an example of a multireaction study without direct observation of all the reaction products.
Temperature dependence of the rate constants for the H + Br2 and D + Br2 reactions
Wada, Youichi,Takayanagi, Toshiyuki,Umemoto, Hironobu,Tsunashima, Shigeru,Sato, Shin
, p. 4896 - 4899 (1991)
The rate constants for the reactions of H + Br2 and D + Br2 were measured by employing a pulse radiolysis-resonance absorption technique.The rate constants could be expressed by the following Arrhenius equations between 214 and 295 K: k(H + Br2) = 6.7 x 10-10 exp( - 680/T), k(D + Br2) = 6.0 x 10-10 exp( - 720/T), in units of cm3 s-1.Sudden transition state theoretical calculations were performed on the basis of modified LEPS surfaces.The calculated results were compared with the experimental ones.
Reaction of Hydrogen and Bromine behind Reflected Shock Waveas
Bopp, J. M.,Johnson, A. C.,Kern, R. D.,Niki, T.
, p. 805 - 807 (1982)
The reaction of equimolar mixtures of hydrogen and bromine diluted by inert gases was studied in the reflected shock zone over a temperature and total density range of 1400-2000 K and 1.5E-6 - 3.3E-6 mol cm-3, respectively.Infrared emission from HBr passing through a narrow inteference filter centered at 3.60 μm was recorded during observation periods typically of 500-μs duration.Conversion of the emission intensity traces to concentration-time data revealed nonlinear product growth for the low-temperature runs and near-linear product profiles at the higher temperatures.The individual experimental profiles were matched with the corresponding model calculations which employed a modern set of rate constants for the various elementary reactions comprising the atomic mechanism.The average percent deviation of 62 experiments from the calculated profiles was 5.4percent.
Water-Catalyzed Dehalogenation Reactions of Isobromoform and Its Reaction Products
Kwok, Wai Ming,Zhao, Cunyuan,Li, Yun-Liang,Guan, Xiangguo,Wang, Dongqi,Phillips, David Lee
, p. 3119 - 3131 (2004)
A combined experimental and theoretical study of the photochemistry of CHBr3 in pure water and in acetonitrile/water mixed solvents is reported that elucidates the reactions and mechanisms responsible for the photochemical conversion of the halogen atoms in CHBr3 into three bromide ions in water solution. Ultraviolet excitation at 240 nm of CHBr 3 (9 × 10-5 M) in water resulted in almost complete conversion into 3HBr leaving groups and CO (major product) and HCOOH (minor product) molecules. Picosecond time-resolved resonance Raman (ps-TR 3) experiments and ab initio calculations indicate that the water-catalyzed O-H insertion/HBr elimination reaction of isobromoform and subsequent reactions of its products are responsible for the production of the final products observed following ultraviolet excitation of CHBr3 in water. These results have important implications for the phase-dependent behavior of polyhalomethane photochemistry and chemistry in water-solvated environments as compared to gas-phase reactions. The dissociation reaction of HBr into H+ and Br- ions is the driving force for several O-H insertion and HBr elimination reactions and allows O-H and C-H bonds to be cleaved more easily than in the absence of water molecules. This water-catalysis by solvation of a leaving group and its dissociation into ions (e.g., H+ and Br- in the examples investigated here) may occur for a wide range of chemical reactions taking place in water-solvated environments.
Kinetic Studies of the Reactions of Atomic Chlorine and Bromine with Silane
Ding, Luying,Marshall, Paul
, p. 2197 - 2201 (1992)
The kinetics of the reactions Cl(2PJ) + SiH4 (1) and Br(2PJ) + SiH4 (2) have been investigated by time-resolved atomic resonance fluorescence spectroscopy.Halogen atoms were generated by flash photolysis of CCl4
MECHANISM AND KINETICS OF Br+HO2 - HBr+O2 AND Br+H2O2 - PRODUCTS OVER THE TEMPERATURE RANGE 260-390 K
Toohey, Darin W.,Brune, Wm. H.,Anderson, J. G.
, p. 1215 - 1222 (1987)
A discharge flow system employing simultaneous, direct detection of HO2 and Br using laser magnetic resonance and resonance fluorescence, respectively, is used to study the kinetics of the title reactions.Over the temperature range 260 to 390 K, decays of