Perylene diimide-based supramolecular polymer with temperature-sensitive ratiometric fluorescence responsiveness in solution and gels
writer：Jie Liua, Yubing Zhanga, Chonghua Zhanga, Peisheng Zhanga, Rongjin Zenga,*, Jiaxi Cuib,*, Jian Chena
keywords：fluorescent polymer nanoparticles; fluorescence resonance energy transfer (FRET); ratiometric fluorescence detection; data encryption; fluorescent imaging
source：期刊
Issue time：2020年
Novel amphiphilic fluorescence building block with perylene diimide (PDI) as core and quadruple H-bonding groups (UPy) as wings (UPy-PDI-UPy) has been synthesized. It shows interesting thermo-responsive ratiometric dual-emission properties in both aqueous solution and hydrogel state. Further contrast experiments with other two analogous derivatives as UPyTPDI-UPy and TEG-PDI-TEG indicated that the presence of supramolecular aggregation induced emission enhancement effect between UPy-PDI-UPy molecules is ascribe to the synergetic effect of intermolecular intrinsic π?π stacking, hydrophobic effect and highly directional quadruple H-bonding. In DMF/H2O (v: v=1: 1), UPy-PDI-UPy self-assembles into nanoparticles with obviously ratiometric fluorescence responsiveness towards temperature in the range of 20-80 °C. Moreover, UPy-PDI-UPy can form a thermo-responsive hydrogel by dispersing in PEG-containing aqueous. The hydrogels show a temperature-dependent ratiometric dual-emission with a narrow responsive range of 20-39 °C and excellent renewable property. This innovative research helps to fabricate novel responsive luminescent materials by using supramolecular self-assembly behavior.