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Citation: Xu Guangzhi, Zhao Yaoxing, Suen Xiangyu, Liu Yang, Song Xinqi. ESR STUDY ON THE ACTIVE RADICALS PRODUCED BY THE PHOTOLYSIS OF ARENEDIAZONIUM SALTS AND THEIR CROWN ETHER COMPLEXES[J]. Acta Physico-Chimica Sinica, ;1985, 1(04): 329-334. doi: 10.3866/PKU.WHXB19850406 shu

ESR STUDY ON THE ACTIVE RADICALS PRODUCED BY THE PHOTOLYSIS OF ARENEDIAZONIUM SALTS AND THEIR CROWN ETHER COMPLEXES

1.
Institute of Chemistry, Academic Sinica, Beijing; Chmistry and Chemical Engineering Department, Qinghua University, Beijing

Received Date: 20 November 1984
Available Online: 15 August 1985

Free radicals produced by the photolysis processes of arenediazonium salts and their crown ether complexes have been investigated by combination of spin trapping technique and ESR spectrometry. The results show that the active radicals R-C_6H_4 are produced during the course of photolysis of these compounds and can be trapped by spirt trapping reagents phenyl tert-butyl nitrone (PBN) and nitrosodurene (ND) to form spin adduets Ⅰ, Ⅱ, Ⅲ, Ⅳ and Ⅴ.
In the cases of Ⅰ, Ⅱ, Ⅲ, and Ⅳ the effects of different substitue R at the same ring position on a_N are in the order of
o—R OCH_3>H>Br≥Cl
m—R H>Br≥Cl
p—R OCH_3>H>I≥Br≥Cl>NO_2
and the effects of same substituent at different ring position on a_N are in the order of
o—R≥p—R>m—R
The role of crown ether is favourable to the trapping of active radicals.
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