引用本文:
徐广智, 赵瑶兴, 孙祥玉, 刘扬, 宋心琦. 芳基重氮盐及其冠醚络合物光解活泼自由基的ESR研究[J]. 物理化学学报,
1985, 1(04): 329-334.
doi:
10.3866/PKU.WHXB19850406
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
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
芳基重氮盐及其冠醚络合物光解活泼自由基的ESR研究
摘要:
本文用自由基捕捉剂2,3,5,6-四甲基亚硝基苯(ND)及苯亚甲基叔丁基氮氧化物(PBN)与ESR相结合的方法研究了芳基重氮盐RC_6H_4N~+_2BF~-_4(R=F, Cl, Br, I, NO_2, COOH,OCH_3及H)及其与18-冠-6、二苯并-24-冠-8的络合物在苯中的光解过程。结果表明它们光解产生了活泼自由基RC_6H_4并可被ND及PBN捕捉....
English
ESR STUDY ON THE ACTIVE RADICALS PRODUCED BY THE PHOTOLYSIS OF ARENEDIAZONIUM SALTS AND THEIR CROWN ETHER COMPLEXES
Abstract:
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.
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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