Characterization,optical and thermal properties of new azomethines based on heptadecafluoroundecyloxy benzaldehyde |
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Authors: | Agnieszka Iwan Henryk Janeczek Bozena Jarzabek Marian Domanski Patrice Rannou |
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Affiliation: | 1. Electrotechnical Institute, Division of Electrotechnology and Materials Science , M. Sklodowskiej-Curie 55/61 Street, 50-369, Wroclaw, Poland a.iwan@iel.wroc.pl;3. Centre of Polymer and Carbon Materials, Polish Academy of Sciences , 34 M. Curie-Sklodowska Street, 41-819, Zabrze, Poland;4. Laboratoire d'Electronique Moléculaire, Organique et Hybride, UMR5819-SPrAM (CEA-CNRS-Univ. J. FOURIER-Grenoble I), INAC Institut Nanosciences and Cryogénie, CEA-Grenoble , 17 Rue des Martyrs, 38054, Grenoble Cedex 9, France |
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Abstract: | New thermotropic liquid crystals containing a long alkoxysemiperfluorinated chain (-O-(CH2)3-(CF2)7-CF3), one linking unit in mesogenic cores (HC=N-) and different functional end-groups such as 4-hexadecyl-, 4-n-hexadecyloxy- chain, or biphenyl-4-carbonitrile, 4-diazenyl-N,N-dimethylbenzene or pyren were synthesized via a one-step route. The methods of nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), ultraviolet–visual (UV-vis) and photoluminescence (PL) spectroscopy as well as differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) were used. The absorption (UV-vis) and PL features of all compounds are documented. The amine had an effect on the mesomorphic properties of the azomethines. An enantiotropic smectic phase was observed for all of the systems studied. As a result of DSC and POM investigations, it is shown that liquid crystalline properties of the azomethines exhibit a strong dependence of the end-groups. The mesomorphic behaviour of the compounds was investigated also by FTIR(T) and UV-vis(T) spectroscopy. Current–voltage measurements were performed on an ITO/compound/Alq3/Al device. |
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Keywords: | azomethines liquid crystals heptadeca fluoroundecyloxy benzaldehyde photoluminescence current-voltage measurements |
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