Experimental and theoretical studies of 2,5-diphenyl-1,4-distyrylbenzenes with all-cis- and all-trans double bonds: chemical structure determination and optical properties
作者:Zengqi Xie、Bing Yang、Linlin Liu、Mao Li、Dong Lin、Yuguang Ma、Gang Cheng、Shiyong Liu
DOI:10.1002/poc.935
日期:2005.9
2,5-Diphenyl-1,4-distyrylbenzene (DPDSB) with all-cis (cis-DPDSB) and all-trans double bonds (trans-DPDSB) were synthesized by Wittig reaction and the differences in structural and optical properties between the cis- and trans-isomers are discussed in detail. Both compounds were fully characterized by NMR spectroscopy, FT-IR spectroscopy, x-ray crystallography, differential scanning calorimetry (DSC)
通过Wittig反应合成了具有全顺式(顺式-DPDSB)和全反式双键(反式-DPDSB)的2,5-二苯基-1,4-二苯乙烯基苯(DPDSB),以及顺式之间的结构和光学性质的差异-和反式异构体被详细讨论。两种化合物均已通过NMR光谱,FT-IR光谱,x射线晶体学,差示扫描量热法(DSC)和电化学方法进行了全面表征。X射线分析和分子模拟表明,顺-DPDSB的结构沿二苯乙烯基苯和三联苯方向均明显偏离平面度,且晶体间的分子间相互作用较少。这与反式异构体相比,顺式异构体在吸收光谱中显示出较大的蓝移,并且循环伏安法测量得出,顺式和反式的带隙分别为3.16和2.97 eV-DPDSB。两种化合物在固态下均显示出异常强的蓝色荧光,这可能是由于两个异构体之间存在弱的分子间相互作用,这是由于被取代的苯基基团引起的大位阻所致。DSC实验确定两种异构体均具有出色的热稳定性,这表明它们可以用作活性层以制造稳定的器件