作者:Kent M. Ervin、Scott Gronert、S. E. Barlow、Mary K. Gilles、Alex G. Harrison、Veronica M. Bierbaum、Charles H. DePuy、W. C. Lineberger、G. Barney Ellison
DOI:10.1021/ja00171a013
日期:1990.7
vinylidene was also determined: HCWH - H2C=C: AHbo = 47.4 f 4.0 kcal mol-'. As part of this study, proton transfer kinetics in a flowing afterglow/selected-ion flow tube apparatus were used to refine the acidities of ethylene, acetylene, and vinyl. The gas-phase acidity of acetylene was tied to the precisely known values for hydrogen fluoride, AGsdd298(HF) = 365.6 f 0.2 kcal mol-', and water, AG-(H20) = 383
采用负离子光电子能谱和气相质子转移动力学测定乙炔、乙烯和乙烯基自由基的 CH 键解离能:Do(HCC-H) = 131.3 f 0.7 kcal mol-', Do(CH2CH-H) = 109.7 f 0.8 kcal mol-',Do(CH2C-H) = 81.0 f 3.5 kcal mol-'。导出了乙炔和乙烯及其碎片中每个其他 CH 和 CC 键的强度。还测定了将乙炔异构化为亚乙烯基所需的能量:HCWH - H2C=C:AHbo = 47.4 f 4.0 kcal mol-'。作为这项研究的一部分,流动余辉/选择离子流管装置中的质子转移动力学被用于改进乙烯、乙炔和乙烯基的酸度。乙炔的气相酸度与准确已知的氟化氢值有关,AGsdd298(HF) = 365.6 f 0.2 kcal mol-',和水,AG-(H2O) = 383.9 f 0.3 kcal mol',产生 AG-(HCC-H)