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Anion-induced ionic liquid crystals of diphenylviologens

Abstract

Two series of ionic liquid crystals derived from diphenylviologens 1-2 were prepared and their photophysical and electrochemical properties were also investigated. 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 with the calculated effective radius (Reff) in compounds 2-X was obtained. Aggregation-induced emission (AIE) ranged from ca. 463-529 nm observed in compounds 2-X (e.g., X = BF4, PF6, RSO3, OTf and NTf2) was also anions dependent. Also these compounds 2-X exhibited thermal switch with On/Off-emission mode between Cr and SmA phases. On cyclic voltammograms, compound 1-RSO3 (n = 12) exhibited two distinct reversible redox couples, in contrast the compound 2-RSO3 (n = 12) formed spike-like voltammetric peak potentials without redox couples. These viologens-based ILCs might have potential applications for the design of redox active or electrochromic displays.

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Publication details

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, Accepted Manuscript
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    Anion-induced ionic liquid crystals of diphenylviologens

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

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