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有关芳烃离子基的顺磁共振谱研究,近年来取代苯及稠环二种负离子基的报导较多,而联苯系负离子基研究较少。其中二联苯负离子基曾由九线谱扩展为九组五线谱,而对-三联苯负离子基由单线扩展为八线。在上述诸报导中对所得谱图均未曾作出任何理论的说明。我们曾获得高浓度对-三联苯负离子基溶液的谱图为单线及九线,而当稀释到适当的浓度时,谱线数目达到35线。至于邻-及间-三联苯负离子基的电子顺磁共振谱迄今尚未见诸报导,所以联苯系负离子基的电子顺磁共振研究是极不完整的。为此我们合成了三联苯及四联苯各异构体,以便总结联苯系负离子基的顺磁共振谱的规律,并探讨其结构问题。
For aromatic ion based paramagnetic resonance spectroscopy, substituted benzene and condensed ring in recent years, two kinds of negative ion groups reported more, and biphenyl anion less research. Among them, the diphenylene anions have been extended from nine lines to nine sets of staffs, and the p-terphenyl anion from single to eight lines. None of the theoretical statements made in the above reports have been made. We have obtained high-concentration p-terphenyl anion-based solution for the single and nine lines of the spectrum, and when diluted to the appropriate concentration, the number of lines to 35 lines. As far as the o- and m-terphenyl anion-based electronic paramagnetic resonance spectrum has not been reported so far, so biphenyl anion plasma electron paramagnetic resonance study is extremely incomplete. For this reason, we synthesized terphenyls and tetraphenyl isomers in order to summarize the regularity of the paramagnetic resonance spectrum of biphenyl anion and to discuss its structural problems.