摘要
本文合成了两个二茂铁基查耳酮系化合物3b—3eC_5H_5FeC_5H_4CO(CH=CH)_nC_6H_5(n=1,2,3,4)和6a—6cC_5H_5FeC_5H_4(CH=CH)_nCOC_6H_5(n=0,1,2)。为了研究这类三岔共轭体系的结构效应,我们用Mssbauer效应作为探针,研究了茂铁基Fe核周围的电子云分布情况,并用同系因子(1/α)^(2/N)考查了Mossbauer谱参数QS和IS的同系递变规律,结果表明3系中的茂铁基只起代基作用;6系中的茂铁基则为端基,3系中共轭链的增长引起QS值的减小,可能是诱导效应所致,并讨论了取代基的吸电子效应和茂环与铁核间距离对IS和QS值减小的影响。
In this paper, the ferrocenyl chalcone compounds G_5H_5FeC_5H_4CO(CH=CH)_n,C_6H_5(3b—3e) n=1, 2, 3, 4 and C_5H_5FeC_5H_4(GH=CH)_nCOC_6H_5 (6a—6c)n=0, 1, 2 have been synthesized. For a study on the forked conjugative systems, one branch acts as the substituent while the other acts as the terminal group. We use the Mossbauer effect to probe changes in the electronic environment at the iron nuoleus of ferrocenyl. The homologous factor (1/α)^(2/n) is used to demonstrate that the quadrupole splitting (QS) and isomer shift (IS) well conform to the rule of homologous linearity. These results show that. the ferrocenyl group acts only as substituent in eompounds 3b—3e, but in the compounds 6a—6c the ferrocenyl group acts as the terminal group. The length of the eonjugative ohain effects on QS decreases, which are only caused by introduetion effect for eompouds 3b—3e. The decreases in IS as well as QS are discussed in terms of the substituents withdrawing electron effect and the distnce between cyclopentadiene ring and Fe.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1990年第1期1-5,共5页
Acta Chimica Sinica
基金
河南省科委资助
