Self-Assembly and Fluorescence of Tetracationic Liquid Crystalline Tetraphenylethene

Abstract : A series of tetraguanidinium tetraphenylethene (TPE) arylsulfonates with different chain lengths was prepared via ionic self-assembly of tetraguanidinium TPE chloride and the respective methyl arylsulfonates. Liquid crystalline properties were studied by differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction. Tetraguanidinium TPE arylsulfonates with chain lengths of C-8-C-12 displayed hexagonal columnar mesophases over a broad temperature range, while derivatives with longer chains showed oblique columnar phases. In solution all compounds displayed aggregation-induced emission behaviour. Temperature-dependent luminescence spectra of the bulk phase of the tetraguanidinium TPE arylsulfonate with C-14 side chains revealed a strong luminescence both in the solid state and the oblique columnar mesophase. The emission behaviour was rationalized by a unique combination of restriction of intramolecular rotation of the TPE core, Coulomb interaction between the guanidinium cations and pi-pi interactions of the anionic arylsulfonate moieties.
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Submitted on : Wednesday, September 4, 2019 - 1:18:41 PM
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Jakob Knelles, Stuart Beardsworth, Korinna Bader, Johanna R. Bruckner, Andrea Buehlmeyer, et al.. Self-Assembly and Fluorescence of Tetracationic Liquid Crystalline Tetraphenylethene. ChemPhysChem, Wiley-VCH Verlag, 2019, ⟨10.1002/cphc.201900569⟩. ⟨hal-02278421⟩



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