后修饰法合成荧光基团修饰的螺旋聚异腈及其性质研究

文章使用手性大分子引发剂poly-$1_{50}$ 引发手性单体1与非手性单体2共聚得到侧基有活泼酯修饰的共聚物 $\mathrm{poly}(1_{50} - 1_{50} / 2_n)$ ，采用后修饰的方法将羟基修饰的荧光分子3a、3b、3c与poly $(1_{50} - 1_{50} / 2_n)$ 进行酯交换反应，即可得到不同荧光基团修饰的手性螺旋聚异腈 $\mathrm{poly}(1_{50} - 1_{50} / 3_n)$ 。通过核磁共振氢谱（ ${}^{1}\mathrm{H}$ nuclear magnetic resonance, ${}^{1}\mathrm{H}$ NMR）、氟核磁共振谱( ${}^{19}\mathrm{F}$ nuclear magnetic resonance, ${}^{19}\mathrm{F}$ NMR)等手段对聚合物的结构进行表征，使用圆二色光谱(circular dichroism, CD)、荧光光谱及圆偏振发光(circularly polarized luminescence, CPL)光谱对聚合物的光学性质进行表征，发现共聚物poly $(1_{50} - 1_{50} / 3_n)$ 为一类具有CPL效应的高分子材料。

In this work, the chiral macromolecular initiator poly-$1_{50}$ was used to initiate the copolymerization of chiral monomer 1 and chiral monomer 2, generating copolymer poly $(1_{50}-1_{50}/2_{n})$ with active ester modification on the pendants, and then the hydroxy-modified fluorescent molecules 3a, 3b, and 3c were reacted with poly $(1_{50}-1_{50}/2_{n})$ by post-modification. The chiral helical poly $(1_{50}-1_{50}/3_{n})$ modified with different fluorescence groups can be obtained. The structures of the polymers were characterized by ${}^{1}\mathrm{H}$ nuclear magnetic resonance $^{(1)}$ H NMR) and $^{19}\mathrm{F}$ nuclear magnetic resonance $^{(19)}$ F NMR), etc. The optical properties of the polymers were characterized by circular dichroism (CD), fluorescence spectrum and circularly polarized luminescence (CPL) spectrum. It is found that polymer poly $(1_{50}-1_{50}/3_{n})$ is a type of polymer material with CPL effect.