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Volume 203, 2017
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Photoresponsive ionic liquid crystals assembled via halogen bond: en route towards light-controllable ion transporters

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Abstract

We demonstrate that halogen bonding (XB) can offer a novel approach for the construction of photoresponsive ionic liquid crystals. In particular, we assembled two new supramolecular complexes based on 1-ethyl-3-methylimidazolium iodides and azobenzene derivatives containing an iodotetrafluoro-benzene ring as XB donor, where the iodide anion acted as an XB acceptor. DSC and X-ray diffraction analyses revealed that the preferred stoichiometry between the XB donors and acceptors is 2 : 1, and that the iodide anions act as bidentate XB-acceptors, binding two azobenzene derivatives. Due to the high directionality of the XB, calamitic superanions are obtained, while the segregation occurring between the charged and uncharged parts of the molecules gives rise to a layered structure in the crystal lattice. Despite the fact that the starting materials are non-mesomorphic, the halogen-bonded supramolecular complexes exhibited monotropic lamellar liquid-crystalline phases over broad temperature ranges, as confirmed with polarized optical microscopy. Due to the presence of the azobenzene moieties, the LCs were photoresponsive, and a LC-to-isotropic phase transition could be obtained by irradiation with UV light. We envisage that the light-induced phase transition, in combination with the ionic nature of the LC, provides a route towards light-induced control over ion transport and conductance in these supramolecular complexes.

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Publication details

The article was received on 31 Mar 2017, accepted on 05 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7FD00120G
Citation: Faraday Discuss., 2017,203, 407-422
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    Photoresponsive ionic liquid crystals assembled via halogen bond: en route towards light-controllable ion transporters

    M. Saccone, F. F. Palacio, G. Cavallo, V. Dichiarante, M. Virkki, G. Terraneo, A. Priimagi and P. Metrangolo, Faraday Discuss., 2017, 203, 407
    DOI: 10.1039/C7FD00120G

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