Studies on Nitroxides(XXI)--Contact Charge Transfer Complexes of Piperidine Nitroxides with Halomethanes and Their Photo induced Reaction

Chem. J. Chinese Universities ›› 1989, Vol. 10 ›› Issue (1): 45.

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Studies on Nitroxides(XXI)--Contact Charge Transfer Complexes of Piperidine Nitroxides with Halomethanes and Their Photo induced Reaction

Jiang Zhiqin¹, Wu Shuping¹, Zhang Maoxi², Liu Youcheng²

1. Department of Chemistry, Tongji University, Shanghai;
2. Department of Chemistry, Lanzhou University, Lanzhou

Received:1987-09-17 Online:1989-01-24 Published:1989-01-24

Abstract

Abstract: The contact Charge transfer (CCT) complexes formed from piperidine nitroxides and halomethanes and their photo-induced electron transfer reactions were studied by UVabsorption 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.

Key words: Nitroxides, Halomethanes, Charge transfer complex, Photochemical redox reaction

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Studies on Nitroxides(XXI)--Contact Charge Transfer Complexes of Piperidine Nitroxides with Halomethanes and Their Photo induced Reaction

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