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Reversibly Thermochromic Cyclic Dipeptide Nanotubes
Langmuir ( IF 3.7 ) Pub Date : 2018-06-22 00:00:00 , DOI: 10.1021/acs.langmuir.8b00743
Min Jeong Seo , Jisoo Song , Chandra Kantha , Mohammed Iqbal Khazi , Umesha Kundapur , Jung-Moo Heo , Jong-Man Kim

Owing to their capability of forming extensive hydrogen bondings and the facile introduction of chirality, cyclic dipeptides (CDPs) have gained great attention as scaffolds for functional supramolecules. Surprisingly, introduction of a photopolymerizable diacetylene (DA) moiety to the CDP afforded nanotubular structures with enhanced stability and reversible thermochromism. A series of CDP-containing DAs (CDP-DAs) are prepared by coupling 10,12-pentacosadiynoic acid with CDPs, cyclo(-Gly-Ser) and cis/trans cyclo(-Ser-Ser). Fabrication of CDP-DA self-assemblies in a polar chloroform and methanol solvent mixture affords nanotubes comprising single-wall and multiwall structures. The self-assembly behavior and morphology characteristic are examined by scanning electron microscopy and transmission electron microscopy. Next, X-ray diffraction analysis confirms well-ordered lamellar structures with a perfect agreement with the bilayer formation leading to the tubular structure via lamellar scrolling behavior. Upon UV irradiation, monomeric CDP-DA tubular assemblies result in the blue-colored CDP/polydiacetylene (PDA) nanotubes. Interestingly, CDP/PDA nanotubes exhibit a reversible blue-to-red color change for over 10 consecutive thermal cycles. The CDP-DA/PDA supramolecular system demonstrates potential applications in developing stimulus-responsive functional materials.

中文翻译:

可逆热致变色环状二肽纳米管

由于其形成广泛的氢键的能力和容易引入的手性,环状二肽(CDP)作为功能性超分子的支架受到了广泛的关注。令人惊讶地,将可光聚合的二乙炔(DA)部分引入CDP提供了具有增强的稳定性和可逆的热致变色性的纳米管结构。通过将10,12-戊二十二碳二烯酸与CDP,环(-Gly-Ser)和顺/反式环(-Ser-Ser)偶联来制备一系列含CDP的DA(CDP-DA)。在极性氯仿和甲醇溶剂混合物中制造CDP-DA自组装体可得到包含单壁和多壁结构的纳米管。通过扫描电子显微镜和透射电子显微镜检查自组装行为和形态特征。下一个,X射线衍射分析证实层状结构与双层结构形成了完美的一致性,并通过层状滚动行为形成了管状结构。在紫外线照射下,单体CDP-DA管状组件会产生蓝色CDP /聚二乙炔(PDA)纳米管。有趣的是,CDP / PDA纳米管在超过10个连续的热循环中呈现出可逆的蓝到红颜色变化。CDP-DA / PDA超分子系统证明了在开发刺激反应性功能材料方面的潜在应用。在超过10个连续的热循环中,CDP / PDA纳米管表现出可逆的蓝到红颜色变化。CDP-DA / PDA超分子系统证明了在开发刺激反应性功能材料方面的潜在应用。在超过10个连续的热循环中,CDP / PDA纳米管表现出可逆的蓝到红颜色变化。CDP-DA / PDA超分子系统展示了在开发刺激反应性功能材料方面的潜在应用。
更新日期:2018-06-22
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