2013 Fiscal Year Final Research Report
Development of pi-conjugated helical polymers bearing both molecular recognition sites and dynamically axial chirality in the main chain
| Project/Area Number |
23550133
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Polymer chemistry
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
IKAI Tomoyuki 金沢大学, 理工研究域物質化学系, 助教 (90402495)
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| Project Period (FY) |
2011 – 2013
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| Keywords | らせん / 共役高分子 / 軸性キラリティー / 記憶 / 光学活性 / 円二色性 / クラウンエーテル / 動的キラル |
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| Research Abstract |
Poly(biphenyleneethynylene-alt-phenyleneethynylene) derivatives bearing crown ether moieties as molecular recognition sites in the main chains were synthesized, and chirality induction in the obtained polymers upon complexation with optically active amino acids and amines and the stability of the induced helical conformation were investigated by using circular dichroism (CD) spectroscopy in order to construct novel helical pi-conjugated polymers. The obtained polymers folded into a preferred-handed helical conformation in chloroform-acetonitrile (1/9) upon complexation with chiral guests. After replacement of the chiral guests with achiral guests, the induced macromolecular helicity could be maintained and the polymer showed a reversible conformational change between preferred-handed helix and random coil in response to change in solvents. This is the first example of macromolecular helicity memory capable of reversible conformational change.
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