Structure−Reactivity Relationship of Piperidine Nitroxide: Electrochemical, ESR and Computational Studies
作者:Toshihide Yamasaki、Fumiya Mito、Yuko Ito、Sokkar Pandian、Yuichi Kinoshita、Koji Nakano、Ramachandran Murugesan、Kiyoshi Sakai、Hideo Utsumi、Ken-ichi Yamada
DOI:10.1021/jo101961m
日期:2011.1.21
We have synthesized several nitroxides with different substituents which vary the steric and electronic environment around the N−O moiety and have systematically investigated the role of substituents on the stability of the radicals. Our results demonstrated the reactivity toward ascorbate correlates with the redox potential of the derivatives. Furthermore, ab initio calculations also indicated a correlation
我们合成了几种具有不同取代基的氮氧化物,这些氮氧化物会改变N-O部分周围的空间和电子环境,并系统地研究了取代基对自由基稳定性的作用。我们的结果表明,抗坏血酸的反应性与衍生物的氧化还原电位有关。此外,从头算还表明还原率与计算出的单占据分子轨道-最低未占据分子轨道能隙之间存在相关性,但与N-O部分的溶剂可及表面积无关,这支持了实验结果并表明电子因素在很大程度上决定了自由基的稳定性。因此,可以对氮氧化物进行虚拟筛选以优化其稳定性,