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In situ visualizable self-assembly, aggregation induced emission and circularly polarized luminescence of tetraphenylethene and alanine based chiral polytriazole

Abstract

This work provides a novel strategy for the construction and characterization of novel luminescent nano/micro architectures and functional thin solid film at macro scale of chiral aggregation-induced emission (AIE) polymers. By introducing chiral amino acid pendent into AIE scaffolds, we have prepared chiral polytriazole with the backbone of tetraphenylethene (TPE) and alanine by Cu(I)-catalyzed click polymerization. The chiral polytriazole P(TPE-Alanine) product shows a typical AIE property and the capacity to self-assemble into diverse fluorescent nano/micro architectures owing to the induction of the chirality of the amino acid attachments. The nano architectures formed at low concentration undergos a morphological transition from vesicles, “pear-necklace” to helical nanofibers and microfibers while carefully tuning the concentration or the water content of the polymer solution, as revealed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic light scattering (DLS). While the microaggregates formed at high concentration are monitored by fluorescence microscope and it provides a simple and direct in situ visualization of the “fluorescent” morphological alternation processes of the assemblies. The fluorescence imaging provides better contrast and characteristic information of the micro fluorescent assemblies which is easily disguised in SEM imaging. It correlates the assemblies of chiral AIE polymer with their characteristic fluorescence and facilitates a rational design of building blocks to construct desired fluorescent architectures. The polymer also exhibits good film-forming ability and the film shows efficient solid-state emission, excellent optical transparency and aggregation-induced circular dichroism (AICD) and aggregation-induced circularly polarized luminescence (AICPL). From nano to micro scale it is both an ideal candidate for the fabrication of novel functional materials for the promising applications in optoelectronic devices.

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Publication details

The article was received on 17 Feb 2018, accepted on 26 Mar 2018 and first published on 27 Mar 2018


Article type: Paper
DOI: 10.1039/C8TC00838H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    In situ visualizable self-assembly, aggregation induced emission and circularly polarized luminescence of tetraphenylethene and alanine based chiral polytriazole

    Q. Liu, Q. Xia, S. Wang, B. Li and B. Z. Tang, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00838H

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