Experimental Studies of Allene, Methylacetylene, and the Propargyl Radical: Bond Dissociation Energies, Gas-Phase Acidities, and Ion-Molecule Chemistry
作者:Marin S. Robinson、Mark L. Polak、Veronica M. Bierbaum、Charles H. DePuy、W. C. Lineberger
DOI:10.1021/ja00130a017
日期:1995.6
I-propynyl, and propadienylidene radicals: EA(CH2=C=CH) = 0.918 f 0.008 eV, EA(CH3Cd) = 2.718 f 0.008 eV, and EA(CHz=C=C) = 1.794 f 0.008 eV. Gas-phase acidity measurements were made using proton transfer kinetics in a flowing afterglow/selected-ion flow tube and yielded the following for allene, methylacetylene, and the propargyl radical: AGacld(CH2=C=CH-H) = 372.8 f 3 kcal mol-', AGacld(H-CH2C'CH)
电子亲和性和 A&ld 在热化学循环中结合以获得丙二烯、甲基乙炔和炔丙基自由基的键解离能:Do(CH2eC=CH-H) = 88.7 f 3 kcal mol-', Do(HCH2CECH) = 90.3 f 3 kcal mol-',Do(CH3CrC-H) = 130.2 f 3 kcal mol-',Do(CHZ=C=CH) = 100 f 5 kcal mol-'。使用负离子光电子能谱测定电子亲和性测量结果,得出炔丙基、I-丙炔基和亚丙二烯基自由基的以下结果:EA(CH2=C=CH) = 0.918 f 0.008 eV,EA(CH3Cd) = 2.718 f 0.008 eV,和 EA(CHZ=C=C) = 1.794 f 0.008 eV。在流动的余辉/选择离子流管中使用质子转移动力学进行气相酸度测量,得到丙二烯、甲基乙炔和炔丙基自由基的以下结果: AGacld(CH2=C=CH-H)