Solvent-to-Polymer Chirality Transfer in Intramolecular Stack Structure

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• 作者：Daehoon Lee ; Young-Jae Jin ; Hyojin Kim ; Nozomu Suzuki ; Michiya Fujiki ; Toshikazu Sakaguchi ; Seog K. Kim ; Wang-Eun Lee ; Giseop Kwak
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：July 10, 2012
• 年：2012
• 卷：45
• 期：13
• 页码：5379-5386
• 全文大小：405K
• 年卷期：v.45,no.13(July 10, 2012)
• ISSN：1520-5835

文摘

Solvent-to-polymer chirality transfer was examined using conjugated polymer with intramolecular stack structure (IaSS). When achiral poly(diphenylacetylene)s (PDPAs) dissolved in limonene, the solvent chirality was successfully transferred to the side phenyl stack structure, leading to intramolecular axial chirality. The phenyl鈥損henyl IaSS was under thermodynamic control to readily undergo asymmetric changes in chiral limonene, leading to optical activity in the isotropic structure between the main chain and resonant side phenyl rings. The axial chirality was significantly affected by the chain length and substitution position of the side alkyl groups. The longer alkyl chains and bulkier alkyl group prevented direct intermolecular interactions between the side phenyl rings and the chiral limonene molecules. PDPA with sterically congested, highly stable, and regulated IaSS was not favorable for efficient solvent-to-polymer chirality transfer.