Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 531-540 |
| Number of pages | 10 |
| Journal | Advanced Functional Materials |
| Volume | 13 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Jul 2003 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
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Liquid-crystalline phase behavior in a zwitterionic tetraazapentacene. / Riley, Andrew E.; Mitchell, Gregory W.; Koutentis, Panayiotis A.; Bendikov, Michael; Kaszynki, Piotr; Wudl, Fred; Tolbert, Sarah H.
In: Advanced Functional Materials, Vol. 13, No. 7, 07.2003, p. 531-540.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Liquid-crystalline phase behavior in a zwitterionic tetraazapentacene
AU - Riley, Andrew E.
AU - Mitchell, Gregory W.
AU - Koutentis, Panayiotis A.
AU - Bendikov, Michael
AU - Kaszynki, Piotr
AU - Wudl, Fred
AU - Tolbert, Sarah H.
PY - 2003/7
Y1 - 2003/7
N2 - 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.
AB - 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.
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U2 - 10.1002/adfm.200304223
DO - 10.1002/adfm.200304223
M3 - Article
VL - 13
SP - 531
EP - 540
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 7
ER -