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Issue 43, 2018
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Control of circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer via conformational locks

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Abstract

Circularly polarized luminescence (CPL) from well-organized structures of aggregates has been intensely investigated, while rational design of π-conjugated polymers with pronounced CPL signals at the unimolecular level remains challenging. Herein, we present the design and synthesis of a novel π-conjugated polymer (polymer-1) incorporating a boron ketoiminate unit and bearing a chiral pendant. CPL signals of the resulting polymer can be finely controlled by acquiring stable excited state conformations via conformational locks. Systematic spectroscopic (UV-vis, NMR, CD, fluorescence and CPL) analysis, microscopic studies and molecular dynamics simulations demonstrated that polymer-1 exhibited a CPL signal in a “good solvent” with a dissymmetry factor of ∼10−4 in a single helical form. The variation of the CPL signal was identical to the emission with an average dissymmetry factor (∼10−4) in the CHCl3 solvent with the increase in the concentration of MCH (methylcyclohexane). Modulating the CPL signals via conformational locks opens up a new perspective for the future development of smart CPL-active organic dyads.

Graphical abstract: Control of circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer via conformational locks

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Publication details

The article was received on 15 Aug 2018, accepted on 08 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8PY01209A
Citation: Polym. Chem., 2018,9, 5278-5285
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    Control of circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer via conformational locks

    J. Li, X. Peng, C. Huang, Q. Qi, W. Lai and W. Huang, Polym. Chem., 2018, 9, 5278
    DOI: 10.1039/C8PY01209A

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