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Abstract
N-Alkyl-N-methylpyrrolidinium cations have been used for the design of ionic liquid crystals, including a new type of uranium-containing metallomesogen. Pyrrolidinium salts with bromide, bis(trifluoromethylsulfonyl)-imide, tetrafluoroborate, hexafluorophosphate, thiocyanate, tetrakis(2-thenoyltrifluoroacetonato)europate(III) and tetrabromouranyl] counteranions were prepared. For the bromide salts and tetrabromouranyl compounds, the chain length of the alkyl group C(n)H(2n+1) was varied from eight to twenty carbon atoms (n =8. 10-20). The compounds show rich mesomorphic behaviour: highly ordered smectic phases (the crystal smectic E phase and the uncommon crystal smectic T phase), smectic A phases, and hexagonal. columnar phases were observed, depending on chain length and anion. This work gives better insight into the nature and formation of the crystal smectic T phase, and the Molecular requirements for the appearance of this highly ordered phase. This uncommon tetragonal mesophase is thoroughly discussed on the basis of detailed powder X-ray diffraction experiments and in relation to the existing literature. Structural models are proposed for self-assembly of the molecules within the smectic layers. In addition, the photophysical properties of the compounds containing a metal complex anion were investigated. For the uranium-containing mesogens, luminescence can be induced by dissolving them in an ionic: liquid matrix. The europium-containing compound shows intense red photoluminescence with high colour Purity.
Keywords
liquid crystals, ionic liquids, metallomesogens, pyrrolidinium cations, uranium, DIALKYLDIMETHYLAMMONIUM BROMIDES, HYDROGEN-BOND, THERMOTROPIC MESOMORPHISM, HEXAFLUOROPHOSPHATE SALTS, IMIDAZOLIUM SALTS, PHOSPHONIUM SALTS, HALIDE SALTS, MOLTEN-SALTS, URANYL-ION, PHASES

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Citation

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Chicago
Goossens, Karel, Kathleen Lava, Peter Nockemann, Kristof Van Hecke, Luc Van Meervelt, Kris Driesen, Christiane Görller-Walrand, Koen Binnemans, and Thomas Cardinaels. 2009. “Pyrrolidinium Ionic Liquid Crystals.” Chemistry-a European Journal 15 (3): 656–674.
APA
Goossens, Karel, Lava, K., Nockemann, P., Van Hecke, K., Van Meervelt, L., Driesen, K., Görller-Walrand, C., et al. (2009). Pyrrolidinium ionic liquid crystals. CHEMISTRY-A EUROPEAN JOURNAL, 15(3), 656–674.
Vancouver
1.
Goossens K, Lava K, Nockemann P, Van Hecke K, Van Meervelt L, Driesen K, et al. Pyrrolidinium ionic liquid crystals. CHEMISTRY-A EUROPEAN JOURNAL. 2009;15(3):656–74.
MLA
Goossens, Karel, Kathleen Lava, Peter Nockemann, et al. “Pyrrolidinium Ionic Liquid Crystals.” CHEMISTRY-A EUROPEAN JOURNAL 15.3 (2009): 656–674. Print.
@article{2045699,
  abstract     = {N-Alkyl-N-methylpyrrolidinium cations have been used for the design of ionic liquid crystals, including a new type of uranium-containing metallomesogen. Pyrrolidinium salts with bromide, bis(trifluoromethylsulfonyl)-imide, tetrafluoroborate, hexafluorophosphate, thiocyanate, tetrakis(2-thenoyltrifluoroacetonato)europate(III) and tetrabromouranyl] counteranions were prepared. For the bromide salts and tetrabromouranyl compounds, the chain length of the alkyl group C(n)H(2n+1) was varied from eight to twenty carbon atoms (n =8. 10-20). The compounds show rich mesomorphic behaviour: highly ordered smectic phases (the crystal smectic E phase and the uncommon crystal smectic T phase), smectic A phases, and hexagonal. columnar phases were observed, depending on chain length and anion. This work gives better insight into the nature and formation of the crystal smectic T phase, and the Molecular requirements for the appearance of this highly ordered phase. This uncommon tetragonal mesophase is thoroughly discussed on the basis of detailed powder X-ray diffraction experiments and in relation to the existing literature. Structural models are proposed for self-assembly of the molecules within the smectic layers. In addition, the photophysical properties of the compounds containing a metal complex anion were investigated. For the uranium-containing mesogens, luminescence can be induced by dissolving them in an ionic: liquid matrix. The europium-containing compound shows intense red photoluminescence with high colour Purity.},
  author       = {Goossens, Karel and Lava, Kathleen and Nockemann, Peter and Van Hecke, Kristof and Van Meervelt, Luc and Driesen, Kris and G{\"o}rller-Walrand, Christiane and Binnemans, Koen and Cardinaels, Thomas},
  issn         = {0947-6539},
  journal      = {CHEMISTRY-A EUROPEAN JOURNAL},
  keyword      = {liquid crystals,ionic liquids,metallomesogens,pyrrolidinium cations,uranium,DIALKYLDIMETHYLAMMONIUM BROMIDES,HYDROGEN-BOND,THERMOTROPIC MESOMORPHISM,HEXAFLUOROPHOSPHATE SALTS,IMIDAZOLIUM SALTS,PHOSPHONIUM SALTS,HALIDE SALTS,MOLTEN-SALTS,URANYL-ION,PHASES},
  language     = {eng},
  number       = {3},
  pages        = {656--674},
  title        = {Pyrrolidinium ionic liquid crystals},
  url          = {http://dx.doi.org/10.1002/chem.200801566},
  volume       = {15},
  year         = {2009},
}

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