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Off–off–on chiroptical property switching of a pyrene luminophore by stepwise helicate formation

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Abstract

Pyrene-based chiral ligands (LR and LS) consisting of two chiral imidazole sidearms at the 1,8-positions first form pyrene-bridged oligomers [(L(R or S))3(Zn2+)n], which are chiroptically inactive, with a low concentration of zinc ions (Zn2+). Upon addition of more Zn2+, chiroptically active coordination helicates ([(L(R or S))3(Zn2+)2]) are formed. The stepwise assembly process successfully facilitated an “off–off–on” chiroptical switching process of a pyrene luminophore controlled by the concentration of Zn2+. The resulting pyrene-bridged helicates exhibit high performance in terms of a dissymmetry factor of circular dichroism (|gCD| = 0.006) and circularly polarized luminescence (|gCPL| = 0.01).

Graphical abstract: Off–off–on chiroptical property switching of a pyrene luminophore by stepwise helicate formation

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Publication details

The article was received on 08 Feb 2019, accepted on 06 Mar 2019 and first published on 06 Mar 2019


Article type: Communication
DOI: 10.1039/C9CC01138B
Citation: Chem. Commun., 2019, Advance Article

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    Off–off–on chiroptical property switching of a pyrene luminophore by stepwise helicate formation

    Y. Imai and J. Yuasa, Chem. Commun., 2019, Advance Article , DOI: 10.1039/C9CC01138B

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