新型光学活性含氰基三联苯液晶聚噻吩合成与分子构象

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谌烈
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陈义旺
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姚凯
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周魏华
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李璠
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聂华荣
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1南昌大学化学系,高分子研究所,南昌,330031


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合成了一种含有长柔性间隔基和氰基三联苯液晶基元的发光性聚噻吩衍生物{-[thiopheneyl-CH_2-COO-(CH_2)_6-O-terphenyl-CN]_n-,PT(6)TPhCN}.利用傅里叶变换红外(FT-IR)光谱、核磁共振(1H NMR)、差示扫描量热(DSC)仪、偏光显微镜(POM)、紫外-可见(UV-Vis)吸收光谱和荧光(PL)光谱对单体和聚合物的结构及性质进行了表征.单体都呈现出良好的液晶性能,由于长间隔基的存在,聚合物PT(6)TPhCN也呈现出良好SmA_d相.氰基三联苯的存在还赋予了聚合物良好的光致发光性能,同时,长间隔基也有效地降低了分子间的相互作用,进一步增强了聚合物的发光性能.另外,研究发现,在未引入任何手性元素的情况下,聚合物主链在圆二色(CD)光谱中还呈现出明显的Cotton效应,这可能是由于大体积液晶基元的位阻效应和取向作用,液晶基元环绕主链进行取向的同时诱导聚噻吩主链在长程范围内呈螺旋取向.

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语种: 中文   

基金国家自然科学基金(50773029;50902067)

关键词光致发光 液晶共轭聚合物 三联苯 聚噻吩 螺旋构象


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