Columnar bis(pyridinium) ionic liquid crystals derived from 4-hydroxypyridine: synthesis, mesomorphism and emission properties
作者： Amalia Pană , Monica Iliş , Teodora Staicu , Iuliana Pasuk , Viorel Cîrcu
DOI: 10.1080/02678292.2015.1116630
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摘要: ABSTRACTA series of flexibly linked bis(pyridinium) salts with various counterions (Br−, PF6−, BF4− and OTf-) was designed prepared starting from corresponding N-alkylated 4-pyridones precursors mesogenic 3,4,5-tris(alkyloxy)benzyl moieties (alkyl = dodecyl or tetradecyl). These were investigated for their liquid crystalline properties by a combination differential scanning calorimetry, polarising optical microscopy temperature-dependent powder X-ray diffraction (XRD). Their thermal stability checked thermogravimetric analysis. All salts, except the triflate salt shorter terminal carbon chain, display an enantiotropic behaviour hexagonal columnar (Colh) phase assigned on basis its characteristic texture XRD studies. It found that these luminescent show weak emission in dichloromethane solutions at room temperature pronounced red-shifted solid state. The ...
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