التفاصيل البيبلوغرافية
| العنوان: |
刚性棒状手性聚硅烷诱导非手性超支化聚芴的 超分子手性组装. (Chinese) |
| Alternate Title: |
Supramolecular Chiral Assembly of Achiral Hyperbranched Polyfluorenes Induced by Rigid Rod-Like Chiral Polysilanes. (English) |
| المؤلفون: |
陈海玲, 程笑笑, 缪腾飞, 刘萌, 李洁爱, 张伟, 朱秀林 |
| المصدر: |
Journal of Functional Polymers; dec2019, Vol. 32 Issue 6, p718-727, 10p |
| Abstract (English): |
The synthetic chiral polysilane adopts a rigid rod-like spiral structure, which has unique circular dichroism (CD) characteristics in near ultraviolet (UV) region and can be easily decomposed by UV irradiation. Therefore, chiral polysilanes have become excellent chiral scaffolds for inducing supramolecular chiral assembly of achiral polymers in recent years. In order to further verify the chiral scaffolding capability of chiral polysilane and enrich the types of achiral or optically inactive polymers that were induced to perform supramolecular chiral assembly, hyperbranched polyfluorenes (HPF8s) with different branching units were synthesized on the basis of Suzuki polycondensation reaction, which laid a foundation for further realization of chiral supramolecular assembly of hyperbranched main-chain conjugated polymers induced by using chiral polysilanes as the chiral scaffolds. The supramolecular chiral assembly of HPF8s was successfully induced by an enantiomeric pair of rigid rod-like helical polysilanes bearing (S)- and (R)-2-methylbutyl groups (PSi-S(R)) in a binary solvent mixtures of chloroform and methanol. Optimizing experimental conditions were crucial for boosting the CD amplitudes of HPF8/PSi-S and HPF8/PSi-R hetero-aggregates. The effects of various conditions on the supramolecular chiral assembly behavior of hyperbranched polyfluorenes induced by chiral polysilanes were systematically investigated. Results showed that the choice of cosolvent, the volume ratio of good and poor solvent, the mass concentration ratio of HPF8s to PSi-S(R), and the branching unit content of HPF8s presented great impacts on the chiral expression of the hetero-aggregates. In addition, the optically active HPF8s homo-aggregates were produced by complete photoscissoring reactions at 313 nm, which could be assigned to the Siσ-Siσ* transitions of PSi-S and PSi-R. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
刚性棒状的手性聚硅烷具有独特的圆二色性能且易被光解，属于一种高效的手性诱导 支架。为进一步验证手性聚硅烷的支架手性诱导能力，同时丰富其可手性诱导的非手性聚合物 的结构种类，通过 Suzuki 缩聚反应合成得到了具有不同支化单元含量的超支化聚芴 (HPF8s), 利 用刚性棒状的左手 (S-) 或右手 (R-) 手性的聚硅烷 (PSi-S (R) ) 成功诱导 HPF8s 的手性组装，同时 考察了组装条件对 PSi-S (R) 作为手性支架诱导 HPF8s 手性组装行为的影响。结果表明，共溶剂 的选择、良溶剂和不良溶剂的体积比、HPF8s 与 PSi-S (R) 的质量浓度比以及 HPF8s 的支化单元 含量对于 HPF8/PSi-S (R) 异构聚集体的手性表达均具有显著影响。此外，313 nm 处的近紫外光 辐照能够选择性地完全分解 PSi-S (R), 从而获得具有圆二色活性的 HPF8s 均聚集体 [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Functional Polymers is the property of Journal of Functional Polymers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
