3 years ago

Self-Assembly of Giant Spherical Liquid-Crystalline Complexes and Formation of Nanostructured Dynamic Gels that Exhibit Self-Healing Properties

Self-Assembly of Giant Spherical Liquid-Crystalline Complexes and Formation of Nanostructured Dynamic Gels that Exhibit Self-Healing Properties
Sota Sato, Masafumi Yoshio, Makoto Fujita, Hiroyuki Yokoyama, Junya Uchida, Takashi Kato
Supramolecular self-assembly of 24 forklike mesogenic ligands and 12 transition metal ions led to the formation of giant spherical coordination complexes that exhibit liquid-crystalline (LC) phases. Self-healing LC supramolecular gels were also obtained through the introduction of these LC nanostructured supramolecular giant spherical complexes into dynamic covalent networks formed by cross-linkers and bifunctional polymers. The giant spherical structures of the PdII complexes with 72 rodlike moieties on the periphery were characterized by NMR, diffusion-ordered NMR spectroscopy, and mass spectrometry. These complexes are stable and exhibit lyotropic LC behavior, while the mesogenic ligands show thermotropic LC properties. The self-assembled LC structures of the spherical complexes can be tuned by the length of the rodlike moieties. Crystal ball: Giant well-defined spherical complexes decorated with 72 rodlike mesogens on the surface of the spheres were produced through the metal complexation of 24 mesogenic ligands with 12 PdII ions. The spheres self-assemble to form liquid-crystalline smectic phases in concentrated organic solution. Nanostructured self-healing materials are formed when the liquid-crystalline spherical complex is introduced into a dynamic covalent network.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201707740

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