摘要
本文应用UV法研究了哌啶氮氧自由基与卤代甲烷所形成CCT络合物及其光诱导的电子转移反应。实验发现,氮氧自由基π～π~*的吸收红移。所测得的络合稳定常数值很小,这与CCT络合物形成的特征相符。自由基2作为电子给体在四氯化碳中可发生光诱导的氧化还原反应,导致生成相应的哌啶羟胺盐酸盐;氧对反应的影响并不明显。对由CCT引起的反应机理进行了讨论。
The contact Charge transfer (CCT) complexes formed from piperidine nitroxides and halomethanes and their photo-induced electron transfer reactions were studied by UV absorption spectrometry. It was found that the π-π* transition of the nitroxides in halomethahes showed red shift, and the values of the determined complex stability constants between nitroxides and halomethanes were very low. This was consistent with the formation of their characteristic CCT complexes. The radical 2 as an electron donor underwent a rapid photo-induced redox reaction in carbon tetrachloride leading to the formation of the corresponding piperidine hydroxylamine hydrochloride. Oxygen showed a little influence upon the reaction. The reaction mechanism caused by CCT was briefly described.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第1期45-50,共6页
Chemical Journal of Chinese Universities
基金
中国科学院科学基金
关键词
氮氧自由基
卤代甲烷
CCT络合物
Nitroxides, Halomethanes, Charge transfer complex, Photochemical redox reaction
