Determination of the C4H Bond Dissociation Energies of NADH Models and Their Radical Cations in Acetonitrile
作者:Xiao-Qing Zhu、Hai-Rong Li、Qian Li、Teng Ai、Jin-Yong Lu、Yuan Yang、Jin-Pei Cheng
DOI:10.1002/chem.200390108
日期:2003.2.17
the ten NADH models by 23.3-34.4 kcal mol(-1); this suggests that if the hydride transfer from the NADH models is initiated by a one-electron transfer, the proton transfer should be more likely to take place than the corresponding hydrogen atom transfer in the second step. In addition, some elusive structural information about the reaction intermediates of the NADH models was obtained by using Hammett-type
通过以下方法评估了十种NADH模型(七个1,4-二氢烟酰胺衍生物,两个Hantzsch 1,4-二氢吡啶衍生物和9,10-二氢ac啶)中C4-H键的杂解和均解键能以及它们在乙腈中的自由基阳离子。根据NADH模型与N,N,N',N'-四甲基-对苯二胺自由基高氯酸根在乙腈中的反应构建的四个热力学循环进行滴定量热法和电化学反应(注:C9-H键而不是C4 9,10-二氢ac啶的-H键;但是,除非另有说明,为方便起见,将C9-H键描述为C4-H键。结果表明,对于中性NADH模型,C4-H键的杂合和同质键解离能的能级涵盖了64.2-81.1和67.9-73.7 kcal mol(-1)的范围,分别和(C4-H)(。+)键的杂合和同质键解离能的能级涵盖了NADH模型的自由基阳离子的4.1-9.7和31.4-43.5 kcal mol(-1)的范围, 分别。1-苄基-1,4-二氢烟碱酰胺(BNAH),汉茨1