Synthesis and chiroptical properties of optically active polymer liquid crystals containing azobenzene chromophores
Synthesis and chiroptical properties of optically active polymer liquid crystals containing azobenzene chromophores
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DOI：
10.1002/pola.21398
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
Zhi-qiang Zheng;Jie Xu;Youyi Sun;Jingli Zhou;Biao Chen;Qijin Zhang;Keyi Wang
中科院分区：
文献类型：
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作者：
Zhi-qiang Zheng;Jie Xu;Youyi Sun;Jingli Zhou;Biao Chen;Qijin Zhang;Keyi Wang
合成了一系列光学活性甲基丙烯酸均聚物，聚[(4-{4′-[(S)-2-甲基-1-丁氧基羰基]苯基偶氮}苯氧基)x-甲基丙烯酸亚甲基](x = 0、2、6或11)。通过IR、1H NMR、UV、差示扫描量热法和凝胶渗透色谱对聚合物的结构进行了表征。通过圆二色性（CD）测量研究了薄膜中聚合物的手性光学性质。薄膜的 CD 和 UV 光谱表明，CD 吸收发生在具有长间隔基（x = 6 或 11）的聚合物薄膜中，但没有发生在具有短间隔基（x = 0 或 2）的聚合物薄膜中。用 442 nm 的线偏振光照射后，所有聚合物薄膜的 CD 值均被放大。偶氮苯发色团吸收区（260-360 nm）CD带的放大值表明间隔基长度对聚合物薄膜中手性的转移和光诱导手性都有影响。最大水平的光诱导手性是在含有六个亚甲基单元的聚合物中诱导的。 © 2006 Wiley periodicals, Inc. J Polym Sci Part A：Polym Chem 44：3210–3219，2006
A series of optically active methacrylic homopolymers, poly[(4-{4′-[(S)-2-methyl-1-butyloxycarbonyl]phenylazo}phenoxyl)x-methylene methacrylate] (x = 0, 2, 6, or 11), were synthesized. The structures of the polymers were characterized by IR, 1H NMR, UV, differential scanning calorimetry, and gel permeation chromatography. The chiroptical properties of the polymers in films were investigated with circular dichroism (CD) measurements. The CD and UV spectra of the films suggested that CD absorptions occurred in the films of the polymers with long spacers (x = 6 or 11) but not in the films of the polymers with short spacers (x = 0 or 2). After irradiation with linearly polarized light at 442 nm, the CD values were amplified in all the polymeric films. The amplificatory values of the CD bands in the absorption region (260–360 nm) of azobenzene chromophores suggested that the spacer length had an effect on both the transfer of chirality and photoinduced chirality in the polymeric films. The largest level of photoinduced chirality was induced in the polymer containing six methylene units. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3210–3219, 2006