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Issue 35, 2018
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Anion-induced ionic liquid crystals of diphenylviologens

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Two series of ionic liquid crystals derived from diphenylviologens, 1 and 2, were prepared and their photophysical and electrochemical properties were also investigated. The crystallographic data of two single crystals, 1-RSO3 (n = 10) and 2-BF4 (n = 12), showed that a mono- or bilayer-lamellar structure was induced by intermolecular H-bonds. All mesophases were identified as smectic A phases by POM textures and powder XRD data. A linear correlation plot (R2 = 0.8885) of the d-spacings vs. the calculated effective radius (Reff) in compounds 2-X was obtained. The aggregation-induced emission (AIE) ranging from ca. 463 to 529 nm observed in compounds 2-X (e.g., X = BF4, PF6, RSO3, OTf and NTf2) was also anion dependent. Also, compounds 2-X exhibited thermal switching, with an On/Off-emission mode between the Cr and SmA phases. In its cyclic voltammogram, compound 1-RSO3 (n = 12) exhibited two distinct reversible redox couples; in contrast, compound 2-RSO3 (n = 12) formed spike-like voltammetric peak potentials without redox couples.

Graphical abstract: Anion-induced ionic liquid crystals of diphenylviologens

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The article was received on 23 Jun 2018, accepted on 03 Aug 2018 and first published on 08 Aug 2018

Article type: Paper
DOI: 10.1039/C8TC03090A
Citation: J. Mater. Chem. C, 2018,6, 9430-9444
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    Anion-induced ionic liquid crystals of diphenylviologens

    R. Wang, G. Lee and C. K. Lai, J. Mater. Chem. C, 2018, 6, 9430
    DOI: 10.1039/C8TC03090A

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