Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5190267 | Polymer | 2006 | 6 Pages |
Abstract
Chiral polymers P-1 and P-2 were prepared by the polymerization of (R)-3,3â²-diiodo-2,2â²-bisbutoxy-1,1â²-binaphthyl ((R)-M-1) and (S)-3,3â²-diiodo-2,2â²-bisbutoxy-1,1â²-binaphthyl ((S)-M-1) with 2,5-bis[(4-tributylstannyl)phenyl]-1,3,4-oxadiazole (M-2) via Pd(PPh3)4 catalyzed Stille coupling reaction. 1,3,4-Oxadiazole unit not only has high electron affinity, high thermal and oxidative stability, but also serves as a good chromophore. Polymers have strong blue fluorescence due to the efficient energy migration from the extended Ï-electronic structure of the polymers to the chiral binaphthyl core and can be expected to have potential application in the materials of fluorescent sensors. Circular dichroism (CD) spectra of polymers P-1 and P-2 are almost identical except that they gave opposite signals at each wavelength. The long wavelengths CD effect of P-1 and P-2 can be regarded as the more extended conjugated structure in the repeating unit and a high rigidity of the polymer backbone.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Yixiang Cheng, Lingwu Chen, Xiaowei Zou, Jinfeng Song, Wang Zhiliu,