中文摘要：

以4，4＇-联吡啶分别与一溴癸烷和溴化苄反应，通过化学法合成了2种对称的紫精化合物：二溴化1，1’-二癸基-4，4’-联吡啶盐（对称癸基紫精，DV）和二溴化1，1’-二苄基-4，4’-联吡啶盐（对称苄基紫精，BV），产率均超过75％．运用红外光谱和紫外光谱表征了其结构，并采用光谱电化学法研究了它们的电致变色性能．研究结果表明，DV在0--1．2V区间内可在蓝灰色／蓝紫色之间循环变化，BV在0～-1．0V区间内可在紫红色／浅黄色之间循环变化；DV在波长558nm处，着色响应时间20．9S，褪色响应时间11．4s，最大对比度△Tmax=5％；BV在波长402nm处，着色响应时间11．32S，褪色响应时间21．94s，最大对比度△Tmax=10％．

英文摘要：

Two new symmetric alkene substituted viologen compounds 1,1 ＇-didecyl-4,4＇-bipyridini- um dibraomide （ symmetric decane viologen, DV） and 1 , 1＇-dibenzyl-4,4＇-bipyridinium dibraomide （symmetric benzyl viologen, BV） were synthesized by chemical reaction of 4,4＇-bipyridine with 1- bromodecane and benzyl bromide respectively, and both the yields is over than 75%. The com- pounds were characterized by FTIR and UV-Visible spectra, and their electrochromic properties were studied with spectroelectrochemistry. The results show that the DV can change color between blue grey and royal purple from 0 - - 1.2 V, and the BV can change color between aubergine and light yellow from 0 - - 1.0 V. At the wavelength of 558 nm, the coloring response time RTo and bleaching response time RTb of DV are 20.9 s and 11.4 s respectively, with the maximum transmittance difference △Tmax of 5% ; at the wavelength of 402 nm, the RTc and RTb of BV are 11.32 s and 21.94 s respectively, with the △Tmax of 10%.