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为了比较噻吩多烯和苯多烯三岔共轭体系的性能,合成了三个系列带两个拉电子基团的噻吩多烯三岔化合物(TDn,TEn,TFn),测定了它们在环已烷和乙醇中的电子吸收光谱。实验表明,带两个拉电子基团的噻吩多烯三岔共轭化合物的电子吸收光谱频率也都遵守同系线性规律,相关系数Υ>0.99。与相应的苯多烯化合物的电子光谱相比,吸收峰普遍地红移一个插烯双键所引起的红移数值。相应的同系直线相距很近。△λ_(th)/△λ_E值为0.83-1.10。第一个拉电子基团的引入,化合物的电子吸收峰红移30nm左右,但当第二个拉电子基团引入时,电子吸收峰仅红移3—17nm,其作用只相当于一个取代基。
In order to compare the properties of thiophene polyene and benzene polyene trimerization conjugate system, three series of thiophene polyene trifluorene (TDn, TEn, TFn) with two electron withdrawing groups were synthesized, Electronic absorption spectra in alkanes and ethanol. The experimental results show that the electron absorption spectra of thiophene polyene trifluxes with two electron-withdrawing groups also obey the homology linear rule, the correlation coefficient is 0.99. Compared with the electronic spectrum of the corresponding polyene compound, the red shift value of the absorption peak caused by the redshift of one vinylidene double bond generally. The corresponding homologous line is very close. The Δλ_ (th) / Δλ_E value is 0.83 to 1.10. The first electron-withdrawing group introduced the red shift of the electron absorption peak of the compound by about 30 nm. However, when the second electron-withdrawing group was introduced, the electron absorption peak was only red-shifted by 3-17 nm, which only corresponded to one substituent .