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 - 2003/7/1
Y1 - 2003/7/1
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.
UR - http://www.scopus.com/inward/record.url?scp=0041307101&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0041307101&partnerID=8YFLogxK
U2 - 10.1002/adfm.200304223
DO - 10.1002/adfm.200304223
M3 - Article
AN - SCOPUS:0041307101
VL - 13
SP - 531
EP - 540
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 7
ER -