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Ionic Liquid Crystals Based on Loop-Shaped Copper(I) Complexes

  • Nicolas del Giudice
    Nicolas del Giudice
    Département des Matériaux Organiques, Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), Université de Strasbourg/CNRS, 23 Rue du Loess, F-67000 Strasbourg, France
  • Guillaume Voegeli
    Guillaume Voegeli
    Département des Matériaux Organiques, Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), Université de Strasbourg/CNRS, 23 Rue du Loess, F-67000 Strasbourg, France
  • Jean-Marc Strub
    Jean-Marc Strub
    LSMBO, Institut Pluridisciplinaire Hubert Curien, CNRS UMR7178, Université de Strasbourg, 67000 Strasbourg, France
  • Benoît Heinrich
    Benoît Heinrich
    Département des Matériaux Organiques, Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), Université de Strasbourg/CNRS, 23 Rue du Loess, F-67000 Strasbourg, France
  • , and 
  • Laurent Douce*
    Laurent Douce
    Département des Matériaux Organiques, Institut de Physique et de Chimie des Matériaux de Strasbourg (UMR 7504), Université de Strasbourg/CNRS, 23 Rue du Loess, F-67000 Strasbourg, France
    *Email: [email protected]
Cite this: Inorg. Chem. 2024, 63, 13, 6103–6110
Publication Date (Web):March 18, 2024
https://doi.org/10.1021/acs.inorgchem.4c00728
Copyright © 2024 American Chemical Society

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    Abstract

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    This paper describes the synthesis and characterization of liquid crystals based on loop-shaped cationic copper(I) complexes of a multidentate ligand. Their synthesis involves the one-pot reaction of an alkyloxy-decorated pyridine-aldehyde unit with a diamine (2,2′-(ethylenedioxy)bis(ethylamine)) spacer to form in situ a pyridine-imine quadridentate-N4-donor ligand, L, which is able to chelate a copper(I) center associated with various noncoordinating anions. All of these compounds were characterized by NMR, IR, and electronic absorption spectroscopy, and more particularly by X-ray diffraction and mass spectroscopy, enabling unambiguous assignment of the [ML]+ mononuclear nature of the cationic components. The presence of six flexible alkyloxy chains at each end of the ligand associated with the rigidity of the core complex causes induction of a liquid crystal state with a columnar self-organized architecture, where the columns are packed in a hexagonal two-dimensional network.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.inorgchem.4c00728.

    • Synthetic protocols and characterization (NMR, UV–vis, infrared, mass analysis, and microanalysis) of all cited compounds and additional X-ray experimental data (SWAXS) (PDF)

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    CCDC 23003832300385 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, by emailing [email protected], or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, U.K.; fax: +44 1223 336033.

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