Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 5. Thermodynamics and kinetics of unimolecular decomposition.

Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 5. Thermodynamics and kinetics of unimolecular decomposition.
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5,5-二甲基-1-吡咯啉 N-氧化物的超氧自由基阴离子加合物。

DOI:
10.1021/jp902269t
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发表时间:
2009
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Villamena,FrederickA
Villamena,FrederickA
中科院分区:
--
文献类型:
--
作者:
Villamena,FrederickA

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分别用PCM/BHandLYP/6-311G(d,p)//B3LYP/6-31G(D)和PCM/ROMP2/cc-PVDZ//B3LYP/6-31G(D)对5,5-二甲基-1-吡咯啉N-氧化物、5-甲酰基-5-甲基-1-吡咯啉N-氧化物、5-乙氧甲酰-5-甲基-1-吡咯啉N-氧化物、5-甲酰基-5-甲基-1-吡咯啉N-氧化物、5-乙氧甲酰-5-甲基-1-吡咯烷基-N-氧化物、5-乙氧基甲酰-5-甲基-1-吡咯烷基-N-氧化物、5-甲酰基-5-甲基-1-吡咯烷基-N-氧化物、5-乙氧甲酰基-5-甲基-1-吡咯啉N-氧化物和5-diethoxyphosphoryl-5-methyl-1-pyrrolineN-oxide的超氧阴离子加合物的单分子分解进行了理论计算。结果表明,硝酮−O_2H生成羟基自由基和双自由基的O-−-O键断裂是内能的,而生成亚硝醛的开环步骤是外能的。O-−、O-键断裂和开环过程的能垒表明,前者是反应的限速步骤。在存在和不存在显性水相互作用的情况下,DMPO−O2H的总分解能最好,然而,不同异构体的AMPO−O2H、−−O2H和DEPMPO DEPMPO O2H的分解能没有显著差异。
The unimolecular decomposition of the superoxide radical anion adducts of 5,5-dimethyl-1-pyrrolineN-oxide (DMPO), 5-carbamoyl-5-methyl-1-pyrrolineN-oxide (AMPO), 5-ethoxycarbonyl-5-methyl-1-pyrrolineN-oxide (EMPO), and 5-diethoxyphosphoryl-5-methyl-1-pyrrolineN-oxide (DEPMPO) were computationally investigated by using PCM/BHandLYP/6-311G(d,p)//B3LYP/6-31G(d) and PCM/ROMP2/cc-PVDZ//B3LYP/6-31G(d) levels of theory. Results indicate that the O−O bond scission for nitrone−O2H to form the hydroxyl radical and the biradical is endoergic, and that the ring-opening step to form the nitrosoaldehyde is highly exoergic. The energy barriers for the O−O bond scission and ring-opening processes indicate that the former is the rate-limiting step of the reaction. The overall energetics for DMPO−O2H decomposition in the presence and absence of explicit water interactions was found to be the most preferred; however, no significant differences in the energetics of decomposition among the various isomers of AMPO−O2H, EMPO−O2H, and DEPMPO−O2H were observed.
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发表时间: 2005-06
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影响因子: --
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