Title: Pyrrolidinium Ionic Liquid Crystals with Pendant Mesogenic Groups
Authors: Goossens, Karel
Lava, Kathleen
Nockemann, Peter
Van Hecke, Kristof
Van Meervelt, Luc
Pattison, Phil
Binnemans, Koen
Cardinaels, Thomas # ×
Issue Date: May-2009
Publisher: American Chemical Society
Series Title: Langmuir vol:25 issue:10 pages:5881-5897
Abstract: New ionic liquid crystals (including ionic metallomesogens) based on the pyrrolidinium core are presented. N-Methylpyrrolidine was quaternized with different mesogenic groups connected to a flexible, ω-bromosubstituted
alkyl spacer. The length of the flexible alkyl spacer between the cationic head group and the rigid mesogenic group was varied. The substituted pyrrolidinium cations were combined with bromide, bis(trifluoromethylsulfonyl)imide, tetrakis
(2-thenoyltrifluoroacetonato)europate(III), and tetrabromouranyl anions. The influence of the type of mesogenic unit, the lengths of the flexible spacer and terminal alkyl chain, the size of the mesogenic group, and the type of anion on the thermotropic mesomorphic behavior was investigated. Furthermore, the phase behavior was thoroughly compared with the previously reported mesomorphism of N-alkyl-N-methylpyrrolidinium salts. Low-ordered smectic A phases of the de Vries type, smectic C phases, higher-ordered smectic F/I phases, as well as crystal smectic phases (E and G, J, H, or K)were observed and investigated by polarizing optical microscopy, differential scanning calorimetry, and powder X-ray diffraction.
ISSN: 0743-7463
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Chemistry - miscellaneous
Biochemistry, Molecular and Structural Biology Section
× corresponding author
# (joint) last author

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