Liquid-crystalline phase behavior in a zwitterionic tetraazapentacene
| Autor: | Riley, A. E., Mitchell, G. W., Koutentis, Panayiotis Andreas, Bendikov, M., Kaszynki, P., Wudl, F., Tolbert, S. H. |
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| Přispěvatelé: | Koutentis, Panayiotis Andreas [0000-0002-4652-7567] |
| Rok vydání: | 2003 |
| Předmět: |
Materials science
X ray diffraction Phase composition Optoelectronic devices Olefins law.invention Biomaterials chemistry.chemical_compound Differential scanning calorimetry Liquid crystal law Phase (matter) Electrochemistry Molecule Crystallization Nuclear magnetic resonance spectroscopy Liquid crystals High temperature effects Condensed Matter Physics Electronic Optical and Magnetic Materials Crystallography chemistry Zwitterion X-ray crystallography Switching Phase behavior |
| Zdroj: | Advanced Functional Materials Adv.Funct.Mater. |
| Popis: | A 5,7-dioctadecylquinoxalinophenazine zwitterion 1 has been investigated to determine its thermal phase behavior. A combination of differential scanning calorimetry (DSC), variable temperature low- and high-angle X-ray diffraction (XRD), and deuterium solid-state NMR spectroscopy were used to characterize the different phases of the tetraazapentacene 1. This molecule is found to exist in a variety of crystalline solid phases between room temperature and 167 °C. with different room-temperature phases resulting from crystallization from solution compared with cooling from the melt. Interestingly, the molecule exhibits liquid-crystalline behavior at high temperatures, between 167 °C and 186 °C, above which it becomes an isotropic fluid. The presence of liquid-crystalline behavior in a zwitterionic system opens up the potential for the use of these or related molecules in optoelectronic switching. 13 7 531 540 Cited By :25 |
| Databáze: | OpenAIRE |
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