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    夏庆, 袁勤, Jason C Y NG, 唐本忠, 李冰石. 基于氨基酸取代的噻咯分子的超分子组装结构的构筑[J]. 功能高分子学报, 2019, 32(6): 705-710. doi: 10.14133/j.cnki.1008-9357.20190425001
    引用本文: 夏庆, 袁勤, Jason C Y NG, 唐本忠, 李冰石. 基于氨基酸取代的噻咯分子的超分子组装结构的构筑[J]. 功能高分子学报, 2019, 32(6): 705-710. doi: 10.14133/j.cnki.1008-9357.20190425001
    XIA Qing, YUAN Qin, Jason C Y NG, TANG Benzhong, LI Bingshi. Supramolecular Assembly of Amino Acid Containing Silole Molecules[J]. Journal of Functional Polymers, 2019, 32(6): 705-710. doi: 10.14133/j.cnki.1008-9357.20190425001
    Citation: XIA Qing, YUAN Qin, Jason C Y NG, TANG Benzhong, LI Bingshi. Supramolecular Assembly of Amino Acid Containing Silole Molecules[J]. Journal of Functional Polymers, 2019, 32(6): 705-710. doi: 10.14133/j.cnki.1008-9357.20190425001

    基于氨基酸取代的噻咯分子的超分子组装结构的构筑

    Supramolecular Assembly of Amino Acid Containing Silole Molecules

    • 摘要: 以原子力显微镜和朗格缪尔(LB)膜技术为主要手段,研究了带有氨基酸取代基的聚集诱导发光分子噻咯(silole,SI)在液/固界面和气/液界面的超分子组装行为。SI分子在甲苯/云母的液/固的界面、表面进行超分子组装成超螺旋纤维结构,在低表面压下分子在气/液界面则形成取向条带结构,在高表面压下,条带结构表面吸附的纳米纤维具有类似的取向,纤维彼此交错形成60°角,与云母基底的晶格结构一致。分子的氨基酸取代基诱导SI分子骨架产生螺旋构象,并在超分子组装结构中被进一步放大,分子间通过非共价键聚合成超分子螺旋纤维,而在气/液界面上分子间氢键被破坏,分子难以组装成超螺旋结构,表明多级超分子组装结构不仅与分子的化学结构相关,还受到表/界面因素的影响。

       

      Abstract: The chirality of amino acid containing aggregation induced emission molecule silole (SI) has successfully transferred from the pendant to the silole scaffold. Chirality of the amino acid attachments can not only induce helical conformation of the molecules, but also be amplified as helical assemblies on the higher order architectures of the molecules. The self-assemblies were determined by both the chemical structures of the molecules and the surfaces/interfaces of the molecules. With the employment of atomic force microscope and Langmuir-Blodget technique, the self-assembly of the molecules on the surface of mica and on the air/water interface upon the evaporation of the solvent toluene was studied, respectively. The molecules self-assembled into helical fibers, while self-assembled into aligned ridges on the air/water interface at lower surface pressure, and with aligned nanofibers absorbed on the film at high surface pressure. In toluene the molecules formed intermolecular hydrogen bonds, which stabilized helical assemblies. The hydrogen bonds were patterned in a dislocation way due to the propeller shape of the molecules and the chirality of the amino acid attachments. On the air/water interface hydrogen patterns failed to form due to the lateral affinity between the amino acid attachments and water, and the hydrophobic repulsion between silole scaffold and water. Film of aligned ridges was formed with aligned fibers attaching to the surface of the aligned ridges. The aligned fibers had the same orientation with the underlying substrate mica, suggesting that the surface also played a critical role in determining the morphology of the assemblies.

       

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