TY - JOUR
T1 - Organic glasses with tunable liquid-crystalline order through kinetic arrest of end-over-end rotation
T2 - The case of saperconazole
AU - Chen, Zhenxuan
AU - Yu, Junguang
AU - Teerakapibal, Rattavut
AU - Meerpoel, Lieven
AU - Richert, Ranko
AU - Yu, Lian
N1 - Funding Information:
This work was supported by the National Science Foundation under Grant No. DMR-1904601. The authors thank Janssen Pharmaceutica NV for supplying saperconazole as well as the Molecular Structure Laboratory at University of Wisconsin-Madison and I. Guzei for assistance in collecting X-ray scattering data.
Publisher Copyright:
This journal is © The Royal Society of Chemistry.
PY - 2020/2/28
Y1 - 2020/2/28
N2 - Liquid crystals (LCs) undergo fast phase transitions, almost without hysteresis, leading to the notion that it is difficult to bypass LC transitions. However, recent work on itraconazole has shown that a nematic-to-smectic phase transition can be frustrated or avoided at moderate cooling rates. At each cooling rate, the highest smectic order obtained is determined by the kinetic arrest of the end-over-end molecular rotation. We report that the same phenomenon occurs in the system saperconazole, an analog of itraconazole where each of the two Cl atoms is replaced by F. Saperconazole has a wider temperature range over which smectic order can develop before kinetic arrest, providing a stronger test of the previous conclusion. Together these results indicate a general principle for controlling LC order in organic glasses for electronic applications.
AB - Liquid crystals (LCs) undergo fast phase transitions, almost without hysteresis, leading to the notion that it is difficult to bypass LC transitions. However, recent work on itraconazole has shown that a nematic-to-smectic phase transition can be frustrated or avoided at moderate cooling rates. At each cooling rate, the highest smectic order obtained is determined by the kinetic arrest of the end-over-end molecular rotation. We report that the same phenomenon occurs in the system saperconazole, an analog of itraconazole where each of the two Cl atoms is replaced by F. Saperconazole has a wider temperature range over which smectic order can develop before kinetic arrest, providing a stronger test of the previous conclusion. Together these results indicate a general principle for controlling LC order in organic glasses for electronic applications.
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U2 - 10.1039/c9sm02180a
DO - 10.1039/c9sm02180a
M3 - Article
AN - SCOPUS:85080859754
SN - 1744-683X
VL - 16
SP - 2025
EP - 2030
JO - Soft Matter
JF - Soft Matter
IS - 8
ER -