Chiroptically Active Photonics Polymers: Synthesis and Chiroptically Switching Properties of Helical Polyacetylene Bearing Electrochromic Viologens in the Side Chains
文献类型：期刊论文
| 作者 | Deng, Jian; Zhou, Can; Song, Naiheng |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2009-09-22 |
| 卷号 | 42期号:18页码:6865-6872 |
| ISSN号 | 0024-9297 |
| DOI | 10.1021/ma901326h |
| 英文摘要 | Toward near-infrared chiroptically active photonics polymers, anew type of optically active polyacetylene bearing L-alanine and electrochromic viologen in the side chains was prepared and carefully studied for the chiroptical properties. The resulting polymer exhibited much larger optical rotation ([m](25)(D) = -1310 degrees, DMF) than the model compound ([phi](25)D = 201 degrees, DMF) as well as a strong negative circular dichroism (CD) signal attributable to backbone absorption, indicating the formation of a single-handed helical structure of the polymer main chain. The content of viologen in the polymer was determined to be > 70 mol % relative to the repeat unit by NMR and X-ray photoelectron spectrscopy. Because of the chiral perturbation of the helical main chain, the viologens in the side chains are asymmetrically positioned and interacted to yield a new strong negative CD band at long wavelengths (i.e., 450-800 nm) upon reduction to radical cations. The intensity of this CD signal could be easily switched between nearly 0 and -1.0 x 10(4) deg cm(2) dmol(-1) by redox cycles, which Could be repeated for Five times without incurring any deterioration of the sample solution. The rotatory strength of the CD signal was calculated to be 1.3 x 10(-40) esu(2) cm(2) according to Moffitt and Moscowitz's equation, which should coil tribute non trivially to the chit-optical properties of the polymer at the near-infrared spectral region. |
| 语种 | 英语 |
| 出版者 | AMER CHEMICAL SOC |
| WOS记录号 | WOS:000269699400008 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/67921]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Song, Naiheng |
| 作者单位 | Peking Univ, Coll Chem & Mol Engn, Key Lab Polymer Chem & Phys, Beijing Natl Lab Mol Sci,Minist Educ, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Deng, Jian,Zhou, Can,Song, Naiheng. Chiroptically Active Photonics Polymers: Synthesis and Chiroptically Switching Properties of Helical Polyacetylene Bearing Electrochromic Viologens in the Side Chains[J]. MACROMOLECULES,2009,42(18):6865-6872. |
| APA | Deng, Jian,Zhou, Can,&Song, Naiheng.(2009).Chiroptically Active Photonics Polymers: Synthesis and Chiroptically Switching Properties of Helical Polyacetylene Bearing Electrochromic Viologens in the Side Chains.MACROMOLECULES,42(18),6865-6872. |
| MLA | Deng, Jian,et al."Chiroptically Active Photonics Polymers: Synthesis and Chiroptically Switching Properties of Helical Polyacetylene Bearing Electrochromic Viologens in the Side Chains".MACROMOLECULES 42.18(2009):6865-6872. |
入库方式： OAI收割
来源：化学研究所
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