Synthesis and characterization of chiral polymer complexes incorporating polybinaphthyls,bipyridine, and Eu(III) |
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Authors: | Yixiang Cheng Xiaowei Zou Dan Zhu Tingshun Zhu Yan Liu Shuwei Zhang Hui Huang |
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Institution: | 1. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of ChinaSchool of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China;2. School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China |
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Abstract: | Chiral conjugated polymers P‐1 and P‐2 were synthesized by the polymerization of (S)‐3,3′‐diiodo‐2,2′‐bisbutoxy‐1,1′‐binaphthyl and (S)‐6,6′‐dibromo‐2,2′‐bisbutoxy‐1,1′‐binaphthyl, respectively, with 5,5′‐divinyl‐2,2′‐bipyridine through a Heck cross‐coupling reaction. Chiral polymer complexes P‐C‐1 and P‐C‐2 were obtained by the bipyridine chelating coordination of P‐1 and P‐2 with Eu(TTA)3·2H2O (where TTA is 2‐thenoyltrifluoroacetonate). Polymers P‐1 and P‐2 and polymer complexes P‐C‐1 and P‐C‐2 exhibited intense circular dichroism signals, with negative and positive Cotton effects in their circular dichroism spectra. The chiral polymers showed strong green‐blue fluorescence because of the efficient energy migration from the extended π‐electronic structure of the conjugated polymer main to the chiral binaphthyl core. The chiral polymer complexes could have not only polymer fluorescence but also the characteristic fluorescence of Eu(III) (5D0→7F2) at a different excited wavelength. These kinds of chiral polymer complexes incorporating polybinaphthyls, bipyridine, and Eu(III) moieties are expected to provide an understanding of the relationship between the structure and properties of chiral polymer complexes. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 650–660, 2007 |
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Keywords: | chiral polymer complexes Eu(III) fluorescence functionalization of polymers Heck reactions metal‐polymer complexes (S)‐1 1′ ‐binaphthol sensors structure‐polymer relations supramolecular structures |
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