Spin Trapping by 5-Carbamoyl-5-methyl-1-pyrroline <i>N</i>-Oxide (AMPO): Theoretical and Experimental Studies
作者:Frederick A. Villamena、Antal Rockenbauer、Judith Gallucci、Murugesan Velayutham、Christopher M. Hadad、Jay L. Zweier
DOI:10.1021/jo049244i
日期:2004.11.1
distinguishable from the spectrum of the •OH adduct. Theoretical analyses using density functional theory calculations at the B3LYP/6-31+G**//B3LYP/6-31G* level were performed on AMPO and its corresponding superoxide adduct. Calculations predicted the presence of intramolecular H-bonding in both AMPO and its superoxide adduct. The H-bonding interaction was further confirmed by an X-ray structure of AMPO,
合成并表征了5-氨基甲酰基-5-甲基-1-吡咯啉N-氧化物(AMPO)。通过电子顺磁共振(EPR)光谱首次证明了AMPO可以自旋捕获各种自由基。这些自由基各自产生的自旋加合物给出了独特的光谱曲线。是超氧加合物的超精细分裂的常数如下:异构体I(80%),一nitronyl - ñ = 13.0 G和一个β - ħ = 10.8 G; 异构体II(20%),一nitronyl - ñ = 13.1 G,一个β - ħ = 12.5 G,和一个γ - ħ= 1.75 G的AMPO-O的半衰期2 H为约8分钟,类似于用于EMPO观察到,但比DEPMPO-O的显著较短2用H吨1/2〜16分钟。但是,在高信噪比下,AMPO-O 2 H的光谱轮廓与•OH加合物。在AMPO及其相应的超氧化物加合物上进行了使用B3LYP / 6-31 + G ** // B3LYP / 6-31G *水平的密度泛函理论计算