Wei Duo, Yu Yaozheng, Ge Lingling, Wang Zhifeng, Chen Chong, Guo Rong
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China.
Testing Center, Yangzhou University, Yangzhou 225009, China.
Langmuir. 2021 Aug 3;37(30):9232-9243. doi: 10.1021/acs.langmuir.1c01430. Epub 2021 Jul 26.
Various secondary structures, for example, β-sheet hydrogen bonds formed by oligopeptides exhibiting high directionality and selectivity provide a new avenue to regulate optoelectronic performances of supramolecular assemblies constructed by π-conjugated chromophores. In this work, oligopeptide-perylene diimides (AUPDIs) are synthesized to generate β-sheet strands which guide the formation of chiral supramolecular polymers with a diversity of morphologies in combination with the π-π stacking even in aqueous media. Complex morphology transitions are successfully controlled by simply adjusting the water volume fraction in the binary solvent of water and tetrahydrofuran from spherical hollow aggregates to long helical nanowires and to short nanofibers. The mechanism of the assembly changes from cooperative to the isodesmic model relying on AUPDI concentrations. This originates from the transformation in the β-sheet that regulates profoundly the arrangement of the AUPDI molecules. Prominently efficient and positive electronic sensing to triethylamine for highly helical nanowires engenders due to the highly ordered helical arrangement within the nanowires, fourfold of the short nanofibers.
各种二级结构，例如，由具有高方向性和选择性的寡肽形成的β-折叠氢键，为调节由π共轭发色团构建的超分子组装体的光电性能提供了一条新途径。在这项工作中，合成了寡肽-苝二酰亚胺（AUPDIs）以生成β-折叠链，这些链即使在水性介质中也能通过π-π堆积引导形成具有多种形态的手性超分子聚合物。通过简单地调节水和四氢呋喃二元溶剂中的水体积分数，成功地控制了从球形空心聚集体到长螺旋纳米线再到短纳米纤维的复杂形态转变。组装机制从协同模型转变为依赖于AUPDI浓度的等键模型。这源于β-折叠中的转变，该转变深刻地调节了AUPDI分子的排列。由于纳米线内高度有序的螺旋排列，长螺旋纳米线对三乙胺产生了显著高效且正向的电子传感，短纳米纤维的传感效率是其四倍。
