Energetics and structure of the 1- and 2-adamantyl radicals and their corresponding carbonium ions by photoelectron spectroscopy
作者:Gary H. Kruppa、J. L. Beauchamp
DOI:10.1021/ja00269a007
日期:1986.4
in isobutane (assumed to be 95 kcal/mol). The effects of the geometrical constraints imposed by the adamantyl cage on the homolytic and heterolytic C-H bond cleavage energies are discussed for the I and 2-adamantyl cases. The width of the Franck-Condon envelope obtained is related to the geometry changes that occur upon ionization. The surprisingly broad envelope observed for the planar 2-adamantyl radical
1和2-金刚烷基甲基亚硝酸盐通过闪光真空光解形成的1和2-金刚烷基自由基的第一个光电子带已经获得。1-金刚烷基自由基的绝热 (IP,) 和垂直 (IP,) 电离电位分别为 6.21 f 0.03 和 6.36 f 0.05 eV。2-金刚烷基的 IP 和 IP 分别为 6.73 f 0.03 和 6.99 f 0.05 eV。1-金刚烷基和叔丁基阳离子之间的氢化物亲和力差异(Sharma, RB; Sen Sharma, DK; Hiraoka, K.; Kebarle, P. J. Am. Chem. SOC. 1985, 107, 3747)与叔丁基和 1-金刚烷基之间的 IP 差异 (0.49 f 0.06 eV) 产生 99 kcal/mol 的金刚烷叔 CH 键能值,3.7 f 1.2 kcal/mol 大于叔 CH 键异丁烷中的能量(假设为 95 kcal/mol)。对于 I 和