Synthesis and Redox-Driven Chiroptically Switching Properties of Viologen-Containing Optically Active Polymer with Main-Chain Axial Chirality
文献类型：期刊论文
| 作者 | Deng, Jian1,2; Zhou, Can2; Chen, Chi2; Song, Naiheng1; Su, Zhixing1 |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2008-11-11 |
| 卷号 | 41期号:21页码:7805-7811 |
| ISSN号 | 0024-9297 |
| DOI | 10.1021/ma8014646 |
| 英文摘要 | A novel type of redox-based chiroptically switching polymer was prepared by grafting electrochromic viologens onto side chains of a 1,1'-binaphthyl-6,6'-diyl-based optically active conjugated polymer. The resulting polymer exhibited much larger mean residue optical rotation ([m](D)(20) = -3308 degrees) than the molar rotation of the corresponding model compound (R)-BBEBPP ([phi](D)(20) = +384 degrees) and an intense negative CD signal in the absorption band of the polymer backbone, indicating a secondary chirality of the main chain. The viologen-grafting ratio was determined to be similar to 50% by proton NMR and thermogravimetric analysis, which corresponds to a predominant polymer structure with one viologen on each repeat unit. Due to the presence of viologen groups, the polymer exhibited a distinctive color change from light yellow to dark blue upon electrochemical or chemical reduction of cationic viologens (V2+) to radical cations (V+center dot). Correspondingly, the CD spectrum of P4 (V+center dot) showed two new positive Cotton effects in the absorption bands of V+center dot at 404 and 520 nm. In comparison with the small molecular model compound that exhibited stronger negative Cotton effects in absorption bands of V+center dot, P4 (V+center dot) has a quite different CD pattern, which was attributed to a different exciton coupling mechanism between the two. By taking advantage of the pronounced changes in the CD spectrum of P4 before and after reduction (e.g., [theta] from measuring nearly 0 to 1.2 x 10(4) deg cm(2) dmol(-1) at 404 nm or 5.9 x 10(3) deg cm(2) dmol(-1) at 520 nm), redox-driven chiroptically switching properties of P4 was probed in a DMF solution using tin as the reducing agent. After five redox cycles, no deterioration of the sample solution was observed and good reversibility in CD signals was demonstrated. |
| 语种 | 英语 |
| WOS记录号 | WOS:000260612700009 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/64187]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Song, Naiheng |
| 作者单位 | 1.Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Gansu, Peoples R China 2.Peking Univ, Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys, Minist Educ, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Deng, Jian,Zhou, Can,Chen, Chi,et al. Synthesis and Redox-Driven Chiroptically Switching Properties of Viologen-Containing Optically Active Polymer with Main-Chain Axial Chirality[J]. MACROMOLECULES,2008,41(21):7805-7811. |
| APA | Deng, Jian,Zhou, Can,Chen, Chi,Song, Naiheng,&Su, Zhixing.(2008).Synthesis and Redox-Driven Chiroptically Switching Properties of Viologen-Containing Optically Active Polymer with Main-Chain Axial Chirality.MACROMOLECULES,41(21),7805-7811. |
| MLA | Deng, Jian,et al."Synthesis and Redox-Driven Chiroptically Switching Properties of Viologen-Containing Optically Active Polymer with Main-Chain Axial Chirality".MACROMOLECULES 41.21(2008):7805-7811. |
入库方式： OAI收割
来源：化学研究所
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