Development and Application of Double-Stranded Helical Polymers with Extension and Contraction Motions Triggered by External Stimuli

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05166
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35010:Polymer chemistry-related
• Research Institution: Meijo University
• Principal Investigator: Taura Daisuke 名城大学, 理工学部, 准教授 (20622450)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 超分子 / 二重らせん

Outline of Final Research Achievements

In this work, the following results were obtained: (1) For stepwise synthesis of the double-stranded helical polymers composed of a monomeric spiroborate-based double-stranded helicate unit with reversible extension and contraction (elastic) motions induced by external stimuli, an octaphenol derivative was synthesized as the dimeric ligand. (2) For immobilization of the elastic double-stranded helical molecules and polymers on the substrates, a spiroborate-based double-stranded helicate bearing the trimethylsilylethynyl (TMSC≡C) units at both terminals was synthesized and its TMSC≡C units were converted to the ethynyl (C≡C) units with maintaining its double-helical structure. (3) For preparation of the two-dimensional sheet with the honeycomb structure consisting of the elastic double-helical framework, a tri-branched molecule as the ligand was synthesized by introducing the tetraphenol derivatives at the 1,3,5-positions of the aromatic ring.

Free Research Field

超分子化学

Academic Significance and Societal Importance of the Research Achievements

本研究で目指す、外部刺激に応答して可逆的に伸縮運動する二重らせん高分子の創製と伸縮性材料への応用に関する報告例は皆無である。現状では、鍵となる配位子および二重らせんホウ素ヘリケートを合成した段階に過ぎないものの、今後、得られる成果は、精緻に構造の制御されたデオキシリボ核酸 (DNA) が示す高度な機能発現に二重らせん構造が重要であることを実証するだけではなく、生体系をも凌駕する革新的な伸縮性キラル材料の開拓にも繋がると考えられることから、その学術的・社会的意義は極めて大きい。