Nucleophilic displacement as a function of hydration number and temperature: rate constants and product distributions for OD-(D2O)0,1,2,3 + CH3Cl at 200-500 K
ALTHOUGH the vibration–rotation structure of the hydroxyl radical emission spectrum in the infra-red has been observed both from flames1 and from the chemiluminescent reaction2 of hydrogen atoms with oxygen molecules: H· + ·O2· → HO2· H· + HO2· → 2 ·OH† (where ·OH† denotes a vibrationally excited hydroxyl radical), there has been no report of the infra-red absorption spectrum of ·OH. The purpose of
Production and trapping of HOSO2 from the gaseous reaction OH+SO2: the infrared absorption of HOSO2 in solid argon
作者:Yu-Ping Kuo、Bing-Ming Cheng、Yuan-Pern Lee
DOI:10.1016/0009-2614(91)90067-j
日期:1991.2
and condensed onto a CsI window maintained at 12 K. In the infrared spectrum of the matrix, absorption lines at 3539.8, 1309.2, 1097.2, 759.3 and (with less certainty) 1296.2 cm−1 have been assigned to HOSO2 on the basis of 34S- and 2H-isotopic shifts. When O2 was present in the flow reactor, HOSO2 became undetectable, whereas HO2 and SO3 were identified.
Gas-phase hydrogen-deuterium exchange reactions of hydroxide and hydroxide-d ions with weakly acidic neutrals
作者:Joseph J. Grabowski、Charles H. DePuy、Veronica M. Bierbaum
DOI:10.1021/ja00347a009
日期:1983.5
Rate constants for hydrogen-deuteriumexchange reactions between HO/sup -/ and DO/sup -/ and a series of weakly acidic neutrals, both organic and inorganic, have been measured in the gas phase by using the selected ion flow tube (SIFT) technique. The reaction efficiencies are discussed in terms of the initial ion-dipole complex energies, the relative acidities of the neutrals, and the change in solvation
Temperature Dependence and Kinetic Isotope Effects for the OH + HBr Reaction and H/D Isotopic Variants at Low Temperatures (53−135 K) Measured Using a Pulsed Supersonic Laval Nozzle Flow Reactor
作者:Christopher Mullen、Mark A. Smith
DOI:10.1021/jp045540n
日期:2005.5.1
form k = A(T/298)(-n), with k1 (OH + HBr) = (10.84 +/- 0.31) x 10(-12) (T/298)(-0.67+/-0.02) cm3/s, k2 (OD + HBr) = (6.43 +/- 2.60) x 10(-12) (T/298)(-1.19+/-0.26) cm3/s, k3 (OH + DBr) = (5.89 +/- 1.93) x 10(-12) (T/298)(-0.76+/-0.22) cm3/s, and k4 (OD + DBr) = (4.71 +/- 1.56) x 10(-12) (T/298)(-1.09+/-0.21) cm3/s. A global fit of k vs T over the temperature range 23-360 K, including the newOH + HBr
Temperature-Dependent Kinetic Isotope Effects in the Gas-Phase Reaction: OH + HBr
作者:Veronica I. Jaramillo、Mark A. Smith
DOI:10.1021/jp004328q
日期:2001.6.1
The temperature dependence of the hydrogen transfer rate coefficients for the reactions: OH + HBr (Reaction 1), OD + HBr (Reaction 2), OH + DBr (Reaction 3), and OD + DBr (Reaction 4) have been investigated at temperaturesbetween 120 and 224 K using a pulsed uniform supersonic flow monitoring hydroxyl reactive loss. The lack of observed isotopic scrambling indicates the reaction occurs by H/D atom
氢转移率系数对反应的温度依赖性:OH + HBr(反应 1)、OD + HBr(反应 2)、OH + DBr(反应 3)和 OD + DBr(反应 4)已在温度下进行了研究在 120 和 224 K 之间,使用脉冲均匀超音速流监测羟基反应损失。没有观察到同位素加扰表明该反应是在所有温度下通过 HBr/DBr 的 H/D 原子转移而发生的。速率系数在 200 K 以上几乎没有温度依赖性,但在 200 K 以下有很强的逆温度行为。目前的工作为低温下的温度依赖性和逆初级和次级动力学同位素效应 (kH/kD < 1) 提供了明确的实验证据。在 120 K 时观察到的动力学同位素比 kH/kD 用于 HBr 的初级取代;k1/k3) 1.