2108-20-5Relevant academic research and scientific papers
Production of Halomethylenes in Free-Jet Expansion from a Hot Nozzle: Identification and Characterization of HCBr and DCBr by Laser-Induced Fluorescence Excitation Spectroscopy
Xu, Songlin,Beran, Kyle A.,Harmony, Marlin D.
, p. 2742 - 2743 (1994)
The efficient production of chloromethylene and bromomethylene by hot-nozzle pyrolysis and subsequent supersonic free-jet expansion has been demonstrated.In the case of the bromocarbene, the LIF-excitacion spectral measurements represent the first direct observations of this species.Visible spectra for both HCBr and DCBr have beeb obtained and are in accord with expectations for a species with nonlinear ground-state and quasilinear excited-state geometries.For the protonated species the excited-state bending frequency is near 840 cm-1 when v2 = 5 and the C-Br stretching frequency is ν3 ca. 783 cm-1.
Kinetics of HCCL + NOx reactions
Baren, Randall E.,Erickson, Mark A.,Hershberger, John F.
, p. 12 - 17 (2002)
The kinetics of reactions of HCCl with NO and NO2 were investigated over the temperature ranges 298-572 k and 298-476 k, respectively, using laser-induced fluorescence spectroscopy to measure total rate constants and time-resolved infrared diode laser absorption spectroscopy to probe reaction products. Both reactions are fast, with k(HCCl + NO) = (2.75 ± 0.2) × 10-11 cm3 molecule-1 s-1 and k(HCCl+NO2) = (1.10 ± 0.2) × 10-10 cm3 molecule-1 s-1 at 296 K. Both rate constants displayed only a slight temperature dependence. Detection of products in the HCCl + NO reaction at 296 K indicates that HCNO + Cl is the major product with a branching ratio of φ = 0.68 ± 0.06, and NCO + HCl is a minor channel with φ = 0.24 ± 0.04.
Dissociations of Gas-Phase CHClF and CHCl2 Radicals and Cations following Collisional Electron Transfer. A Variable-Time Neutralization-Reionization and ab Initio Study
Sadilek, Martin,Turecek, Frantisek
, p. 224 - 232 (2007/10/03)
Variable-time neutralization-reionization mass spectrometry is used to generate CHClF(.) and CHCl2(.) radicals and to study their unimolecular dissociations within 0.4-4.1 μs.Loss of Cl(.) is a major dissociation of CHClF(.) following collisional neutrali
Vaccum ultraviolet absorption spectra and photodissociative excitation of CHBr2Cl and CHBrCl2
Ibuki, Toshio,Hiraya, Atsunari,Shobatake, Kosuke
, p. 8793 - 8798 (2007/10/02)
Photoabsorption and fluorescence excitation spectra of CHBr2Cl and CHBrCl2 trihalomethanes were measured in the 106-200 nm region using synchrotron radiation as a light source.Main photoabsorption bands observed are assigned as the Rydberg transitions of the outer shell orbitals.In the photoexcitation of CHBr2Cl a diffuse emission band of CHCl(1A''--> 1A') was observed in the 500-800 nm region.The radiative lifetime of the CHCl(1A'') state was first determined to be 7.01+/-0.25 μs.In the photolysis of CHBrCl2 at 121.6 nm, the formation of CHCl(1A'') and CCl2(1B1)radicals were observed.The fluorescence thresholds for CHBr2Cl and CHBrCl2 start at 162 and 159 nm with the maximum yields of 5percent and 11percent at 122 and 119 nm, respectively.
On the Reactions of CHCl(X1A') with NO and O2
Wagener, R.,Wagner, H. Gg.
, p. 9 - 14 (2007/10/02)
The reactions of CHCl(X1A') with NO(X) and O2(X) were investigated at room temperature in the gas phase using a quasistatic vacuum reaction cell.CHCl was generated by pulsed exciplex laser photolysis of CHClBr2 and detected directly by laser induced fluorescence (LIF).Reaction rates were determined from concentration profiles of CHCl under first order reaction conditions ( ): k(NO) = (9 +/- 3)x1012 cm3/mol s k(O2) 10 cm3/mol s.The reactivity of CHCl versus NO and O2 is compared to the reactivities of other triatomic carbenes. Key Words: Reaction kinetics / Carbenes / Radicals / Laser photolysis / Laser induced fluorescence
Generation of Monohalogenocarbenes in an Ultrasonic Field
Safiev, O. G.,Nazarov, D. V.,Zorin, V. V.,Rakhmankulov, D. L.
, p. 1642 - 1643 (2007/10/02)
We have studied the generation of monohalogenocarbenes under the influence of ultrasound (22 kHz, 150 W, average intensity 3 W cm-2) in the dihalogenomethane CH2Hal2 (Hal=Cl, Br)-solid potassium hydroxide-triethylbenzylammonium chloride system.The reaction of the monohalogenocarbenes (:CHCl, :CHBr) with some 2-aryl-1,3-dioxacycloalkanes under these conditions yields products in which the carbenes are inserted into the benzyl C-H bond (2-aryl-2-halogenomethyl-1,3-dioxacycloalkanes).The yield of the products, their physicochemical properties, and their 1H NMR spectroscopy parameters have been determined.
