Chiral property of cellulose can be transferred to final materials, here artificial helical polymer, right-handed helical poly(phenyl isocyanide) (PPI) is grafted onto ethyl cellulose (EC) with expecting to enhance the chiral effect of PPI. EC-2,3-g-PPI_n copolymers are prepared via “click” chemistry of copper-catalyzed alkyne-azide cycloaddition, and confirmed by high-resolution ¹H and ¹³C NMR, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). The resulting EC-2,3-g-PPI_n copolymer takes a right-handed helical structure with super circular dichroism intensity which is 302% higher than that of PPI, which indicates that EC backbone promotes the right-handed chirality of PPI_n. Furthermore, EC-2,3-g-PPI_n exhibits good chiral recognition ability of the D/L-Ala-DNSP fluorescent probe, and induces a uniquely visible blue shift for L-Ala-DNSP. Therefore, a novel facile strategy is provided to highly improve chiral property and chiral recognition ability of artificial helical polymers by grafting onto EC.

中文翻译：

---

通过接枝到乙基纤维素上促进螺旋聚（苯基异氰化物）的超手性

纤维素的手性特性可以转移到最终材料中，这里人工螺旋聚合物，右手螺旋聚（异氰）（PPI）接枝到乙基纤维素（EC）上，以期增强PPI的手性效应。EC-2,3-g-PPI _n共聚物是通过铜催化的炔-叠氮化物环加成的“点击”化学制备的，并通过高分辨率¹ H 和¹³ C NMR、傅里叶变换红外光谱 (FTIR) 和凝胶确认渗透色谱 (GPC)。得到的 EC-2,3-g-PPI _n共聚物呈右旋螺旋结构，超圆二色性强度比 PPI 高 302%，表明 EC 骨架促进了 PPI _n的右手手性. 此外，EC-2,3-g-PPI _n对 D/L-Ala-DNSP 荧光探针表现出良好的手性识别能力，并诱导 L-Ala-DNSP 的独特可见蓝移。因此，提供了一种新的简便策略，通过接枝到 EC 上来高度提高人工螺旋聚合物的手性性质和手性识别能力。