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Significantly Red‐Shifted Emissions of Nonconventional AIE Polymers Containing Zwitterionic Components

Nonconventional luminescence polymers without any aromatic structures have attracted great interest from researchers due to their special structure and excellent biocompatibility. However, these materials mostly emit in the blue or green region, in which preparation of materials with long‐wavelength...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2021-07, Vol.42 (14), p.e2100174-n/a
Main Authors: Huang, Qing, Cheng, Jiaqi, Tang, Yuran, Wu, Yongqiong, Xia, Dan, Zheng, Yuchen, Guo, Mingming
Format: Article
Language:English
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Summary:Nonconventional luminescence polymers without any aromatic structures have attracted great interest from researchers due to their special structure and excellent biocompatibility. However, these materials mostly emit in the blue or green region, in which preparation of materials with long‐wavelength (especially near‐infrared) emission is still a great challenge. In this work, it is found that 2‐(dimethyl amino) ethyl methacrylate (DMA) and itaconic anhydride (ITA) undergo a ring‐opening reaction at room temperature, and subsequently generate zwitterionic compound (IDMA). Based on the clustering‐triggered emission (CTE) mechanism, ionic bond can effectively promote the isolated electron‐rich chromophores to form new emissive clusters with extended electron delocalization. Herein, two oligomers (P1 and P2) with different fluorescence emissions by controlling the concentration of zwitterionic monomers before polymerization are synthesized. It is worth noting that the maximum emission wavelength of P2 at high concentration is up to 712 nm, which is very rare in previous reports. In addition, the resulting oligomer (P2) shows typical aggregation‐enhanced emission (AEE), excitation‐dependent fluorescence, temperature‐sensitive emission, and solvatochromism. The cytotoxicity assay demonstrates that P2 was low toxic to Huh7 and LM3 cells, and suitable for cell imaging. This research provides the possibility for rational molecular design and the feasibility of luminescence regulation. In this work, an effective strategy is provided to prepare two nonconventional aggregation‐induced emission (AIE) polymers (P1 and P2) with different photoluminescence (PL) emissions by controlling the concentration of zwitterionic monomers before polymerization. This strategy provides the possibility to prepare nonconventional AIE polymers with diversified or even long‐wavelength emission and shows the feasibility of reasonable molecular design and luminescence regulation.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.202100174