期刊
LANGMUIR
卷 34, 期 20, 页码 5821-5830出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b01035
关键词
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资金
- National Natural Science Foundation of China [51673050, 91427302, U1704149]
- National Key Basic Research Program of China [2016YFA0203400, 2017YFA0206600]
- Chinese Academy of Sciences [XDB12020200]
Soft nanomaterials with circularly polarized luminescence (CPL) have been currently attracting great interest. Here, we report a pyrene-containing pi-peptide dendron hydrogel, which shows 1D and 2D nanostructures with varied CPL activities. It was found that the individual dendrons formed hydrogels in a wide pH range (3-12) and self-assembled into helices with pH-tuned pitches. Through chirality transfer, the pyrene unit could show CPL originated from both the monomer and excimer bands. When cyclodextrin was introduced, different supra-dendrons were obtained with beta-cyclodextrin (PGAc@beta-CD) and gamma-cyclodextrin (PGAc@gamma-CD) through host-guest interactions, respectively. Interestingly, the PGAc@beta-CD and PGAc@gamma-CD supra-dendrons self-assembled into 2D nanosheet and entangled nanofibers, respectively, showing cyclodextrin induced circularly polarized emission from both the monomer and excimer bands of the pyrene moiety. Thus, through a simple host-guest interaction, both the nanostructures and the chiroptical activities could be modulated.
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