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Chiroptically Active Photonics Polymers: Synthesis and Chiroptically Switching Properties of Helical Polyacetylene Bearing Electrochromic Viologens in the Side Chains
Deng, Jian; Zhou, Can; Song, Naiheng
2009-09-22
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume42Issue:18Pages:6865-6872
AbstractToward 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.
DOI10.1021/ma901326h
Indexed BySCI
Language英语
WOS IDWOS:000269699400008
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/67922
Collection中国科学院化学研究所
Corresponding AuthorSong, Naiheng
AffiliationPeking Univ, Coll Chem & Mol Engn, Key Lab Polymer Chem & Phys, Beijing Natl Lab Mol Sci,Minist Educ, Beijing 100871, Peoples R China
Recommended Citation
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.
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