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Title of article :
Polybinaphthyls incorporating chiral (R) or (S)-2,2′-binaphthyland oxadiazole moieties by Stille reaction
Author/Authors :
Cheng، نويسنده , , Yixiang and Chen، نويسنده , , Lingwu and Zou، نويسنده , , Xiaowei and Song، نويسنده , , Jinfeng and Zhiliu، نويسنده , , Wang، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2006
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Abstract :
Chiral polymers P-1 and P-2 were prepared by the polymerization of (R)-3,3′-diiodo-2,2′-bisbutoxy-1,1′-binaphthyl ((R)-M-1) and (S)-3,3′-diiodo-2,2′-bisbutoxy-1,1′-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 π-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.
Keywords :
(R)- and (S)-1 , 1?-Binaphthol , Chiral polymers , 1 , 3 , 4-oxadiazole
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