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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~-1.2 V区间内可在蓝灰色/蓝紫色之间循环变化,BV在0~-1.0 V区间内可在紫红色/浅黄色之间循环变化;DV在波长558 nm处,着色响应时间20.9 s,褪色响应时间11.4 s,最大对比度ΔTmax=5%;BV在波长402 nm处,着色响应时间11.32 s,褪色响应时间21.94 s,最大对比度ΔTmax=10%.
4,4’-dipyridyl was reacted with monobromodecane and benzyl bromide respectively to synthesize two kinds of symmetric viologen compounds: 1,1’-didecyl-4,4’- Bipyridyl (symmetrical decyl viologen, DV) and 1,1’-dibenzyl 4,4’-dipyridyl (symmetrical benzyl viologen, BV) all exceeded 75%. Their structures were characterized by FT-IR and UV-vis spectra and their electrochromic properties were studied by spectrochemical methods. The results show that DV can circulate between blue-gray / blue-purple in the range of 0-1.2 V , BV varied from magenta / light yellow within the range of 0 ~ -1.0 V; DV at 558 nm, the color response time was 20.9 s, the fade response time was 11.4 s, and the maximum contrast was ΔTmax = 5% At the wavelength of 402 nm, the color response time was 11.32 s, the fading response time was 21.94 s and the maximum contrast ΔTmax was 10%.