Experimental and Theoretical Studies of the Redox Potentials of Cyclic Nitroxides
作者:James P. Blinco、Jennifer L. Hodgson、Benjamin J. Morrow、James R. Walker、Geoffrey D. Will、Michelle L. Coote、Steven E. Bottle
DOI:10.1021/jo801099w
日期:2008.9.1
The redox potentials of 25 cyclic nitroxides from four different structural classes (pyrrolidine, piperidine, isoindoline, and azaphenalene) were determined experimentally by cyclic voltammetry in acetonitrile, and also via high-level ab initio molecular orbital calculations. It is shown that the potentials are influenced by the type of ring system, ring substituents and/or groups surrounding the radical
通过循环伏安法在乙腈中以及通过高水平的从头算分子轨道计算,通过实验确定了来自四个不同结构类别(吡咯烷,哌啶,异吲哚啉和氮杂菲烯)的25个环状氮氧化物的氧化还原电势。结果表明,电势受环系统类型,环取代基和/或自由基部分周围基团的影响。对于吡咯烷,哌啶和异二氢吲哚,计算出的氧化电位和实验氧化电位之间具有极好的一致性(平均绝对偏差为0.05 V);然而,对于氮杂苯丙二烯,存在巨大差异(平均绝对偏差为0.60 V),这表明它们的单电子氧化可能涉及理论计算中未考虑的其他过程。