Bicontinuous Cubic Liquid Crystalline Materials from Discotic Molecules: A Special Effect of Paraffinic Side Chains with Ionic Liquid Pendants
作者： Md. Akhtarul Alam , Jin Motoyanagi , Yohei Yamamoto , Takanori Fukushima , Jungeun Kim
DOI: 10.1021/JA905373D
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摘要: Triphenylene (TP) derivatives bearing appropriate paraffinic side chains with imidazolium ion-based ionic liquid (IL) pendants were unveiled to display a phase diagram crystalline (LC) mesophases of bicontinuous cubic (Cubbi) and hexagonal columnar (Colh) geometries. While their transition behaviors are highly dependent on the length size pendants, TPs hexadecyl exclusively form Cubbi LC assembly over an extremely wide temperature range ∼200 °C from room when anions IL relatively small. Wide-angle X-ray diffraction analysis suggested that mesophase contains π-stacked TP arrays plane-to-plane separation ∼3.5 A. Consistently, upon laser flash photolysis, it showed transient microwave conductivity comparable Colh reference.
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