发现H 3 O +和C 2 H 2之间的离子-分子缔合反应的C 2 H 2 ·H 3 O +产物由大约1个碳原子组成。两个异构离子的50:50混合物。这两种同分异构离子在选定的离子流管中通过与中性试剂C 2 H 5 Br,4-氟甲苯,CH 3 OH和苯的质子转移行为不同而被质子化的乙烯醇,CH 2 CHOH 2 +和质子化乙醛,CH 3 CHOH +或静电络合物H 3 O + ·C 2 H 2。这些结论得到基于从头算分子轨道理论的高斯G2能级计算的支持,该计算可用于计算CH 3 CHO,CH 2 CHOH,环氧乙烷和无环CH 2 OCH 2的质子亲和力。还报告了特定C 2 H 5 O +异构体的反应的反应速率系数和产物比率,即:CH 3 CHOH +,CH 3 OCH 2 +图中,用CH 3 OH,4-氟甲苯和C 6 H 6表示。简要讨论了当前结果对星际合成CH 3 CHO的影响。
Ion–Molecule Reactions of Oxygenated Species. Proton–Transfer Reactions Involving CHO+
摘要:
The ionic reactions of the major ions in the mass spectra of formaldehyde, acetaldehyde, ethylene oxide, dimethyl ether, vinyl formate, and formaldehyde–D2O mixtures have been studied and rate constants determined for ions of 2.4-eV exit energy. The major reaction involves formation of the protonated molecule. The rate constants for transfer of a proton from CHO+ to a neutral molecule M vary from 1.28 × 10−9 cm3 molecule−1·sec−1 (M = D2O) to 2.7 × 10−9 cm3 molecule−1·sec−1 (M = vinyl formate). The rate constants are shown to be in reasonable agreement with theoretical predictions.
Proton affinities and photoelectron spectra of three-membered-ring heterocycles
作者:Donald H. Aue、Hugh M. Webb、William R. Davidson、Mariano Vidal、Michael T. Bowers、Harold Goldwhite、Lawrence E. Vertal、John E. Douglas、Peter A. Kollman、George L. Kenyon
Ion–molecule association of H<sub>3</sub>O<sup>+</sup>and C<sub>2</sub>H<sub>2</sub>: interstellar CH<sub>3</sub>CHO
作者:David A. Fairley、Graham B. I. Scott、Colin G. Freeman、Robert G. A. R. Maclagan、Murray J. McEwan
DOI:10.1039/ft9969201305
日期:——
association reaction between H3O+ and C2H2 is found to consist of a ca. 50 : 50 mixture of two isomeric ions. These two isomeric ions are identified in a selected ion flow tube, by their different proton transfer behaviour with the neutral reagents C2H5Br, 4-fluorotoluene, CH3OH and benzene, as protonated vinylalcohol, CH2CHOH2+ and either protonated acetaldehyde, CH3CHOH+ or the electrostatic complex H3O+·
发现H 3 O +和C 2 H 2之间的离子-分子缔合反应的C 2 H 2 ·H 3 O +产物由大约1个碳原子组成。两个异构离子的50:50混合物。这两种同分异构离子在选定的离子流管中通过与中性试剂C 2 H 5 Br,4-氟甲苯,CH 3 OH和苯的质子转移行为不同而被质子化的乙烯醇,CH 2 CHOH 2 +和质子化乙醛,CH 3 CHOH +或静电络合物H 3 O + ·C 2 H 2。这些结论得到基于从头算分子轨道理论的高斯G2能级计算的支持,该计算可用于计算CH 3 CHO,CH 2 CHOH,环氧乙烷和无环CH 2 OCH 2的质子亲和力。还报告了特定C 2 H 5 O +异构体的反应的反应速率系数和产物比率,即:CH 3 CHOH +,CH 3 OCH 2 +图中,用CH 3 OH,4-氟甲苯和C 6 H 6表示。简要讨论了当前结果对星际合成CH 3 CHO的影响。
Ion–Molecule Reactions of Oxygenated Species. Proton–Transfer Reactions Involving CHO<sup>+</sup>
作者:Howard Pritchard、A. G. Harrison
DOI:10.1063/1.1668648
日期:1968.6.15
The ionic reactions of the major ions in the mass spectra of formaldehyde, acetaldehyde, ethylene oxide, dimethyl ether, vinyl formate, and formaldehyde–D2O mixtures have been studied and rate constants determined for ions of 2.4-eV exit energy. The major reaction involves formation of the protonated molecule. The rate constants for transfer of a proton from CHO+ to a neutral molecule M vary from 1.28 × 10−9 cm3 molecule−1·sec−1 (M = D2O) to 2.7 × 10−9 cm3 molecule−1·sec−1 (M = vinyl formate). The rate constants are shown to be in reasonable agreement with theoretical predictions.