Pyrrolidinium Ionic Liquid Crystals with Pendant Mesogenic Groups

被引：63

作者：

Goossens, Karel ^{[1
]}

Lava, Kathleen ^{[1
]}

Nockemann, Peter ^{[1
]}

Van Hecke, Kristof ^{[1
]}

Van Meervelt, Luc ^{[1
]}

Pattison, Phil ^{[2
]}

Binnemans, Koen ^{[1
]}

Cardinaels, Thomas ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, B-3001 Louvain, Belgium

[2] European Synchrotron Radiat Facil, SNBL, F-38043 Grenoble, France

来源：

LANGMUIR | 2009年 / 25卷 / 10期

关键词：

HYDROGEN-BOND; ROOM-TEMPERATURE; DIALKYLDIMETHYLAMMONIUM BROMIDES; PHOSPHONIUM HALIDES; IMIDAZOLIUM SALTS; PHASES; DERIVATIVES; PYRIDINIUM; CONDUCTIVITY; POLYMORPHISM;

D O I：

10.1021/la900048h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

New ionic liquid crystals (including ionic metallomesogens) based oil the pyrrolidinium core are presented. N-Methylpyrrolidine was quaternized with different mesogenic groups connected to a flexible, omega-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 oil 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 its 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.

引用

页码：5881 / 5897

页数：17

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