TY - JOUR
T1 - Dynamic Motion of Twisted πsystem-Induced Temperature-Dependent Dielectric Response in the Neat Liquid State
AU - Takeda, Takashi
AU - Ozawa, Masataka
AU - Akutagawa, Tomoyuki
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI Grant Number JP17K05769, the Murata Science Foundation, and the research program “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” from MEXT, Japan. We thank Dr. Shunsuke Yamamoto and Prof. Masaya Mitsuishi (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University) for photophysical measurement of 2 .
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/8/22
Y1 - 2019/8/22
N2 - Molecular assemblies of twisted πmolecules of tetraphenylene with long alkoxy chains (1) and tetra[2,3]thienylene with long alkylamide chains (2) or long alkoxy chains (3) and their dielectric properties were investigated. Different degrees of intermolecular interaction of 1-3 afforded different molecular assemblies, including an ordered columnar structure, disordered columnar, and lamellar structures. The introduction of long alkyl chains enabled us to create thermally stable liquid crystalline or liquid states. Temperature-dependent dielectric measurement revealed that the dynamic flipping motion of the tetra[2,3]thienylene core of 3 induced a temperature- and frequency-dependent dielectric anomaly in the neat liquid phase. This flipping motion of the central tetra[2,3]thienylene πcore occurred relatively easily in the liquid state with a high degree of freedom of molecular motion.
AB - Molecular assemblies of twisted πmolecules of tetraphenylene with long alkoxy chains (1) and tetra[2,3]thienylene with long alkylamide chains (2) or long alkoxy chains (3) and their dielectric properties were investigated. Different degrees of intermolecular interaction of 1-3 afforded different molecular assemblies, including an ordered columnar structure, disordered columnar, and lamellar structures. The introduction of long alkyl chains enabled us to create thermally stable liquid crystalline or liquid states. Temperature-dependent dielectric measurement revealed that the dynamic flipping motion of the tetra[2,3]thienylene core of 3 induced a temperature- and frequency-dependent dielectric anomaly in the neat liquid phase. This flipping motion of the central tetra[2,3]thienylene πcore occurred relatively easily in the liquid state with a high degree of freedom of molecular motion.
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U2 - 10.1021/acs.jpcc.9b06071
DO - 10.1021/acs.jpcc.9b06071
M3 - Article
AN - SCOPUS:85071446299
SN - 1932-7447
VL - 123
SP - 20152
EP - 20159
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 33
ER -