Issue 13, 2022

Dielectric response of 1,1-difluorosumanene caused by an in-plane motion

Abstract

We have designed and synthesized a new curved π-conjugated molecule, 1,1-difluorosumanene (1), which possesses two fluorine atoms on the same benzylic carbon of unsubstituted sumanene, producing a large dipole moment along the in-plane direction. Thermal analyses, variable-temperature X-ray diffraction, and IR measurements indicated a 120° in-plane motion of 1 in the stacking columns, which did not cause any phase transition in the crystalline state. Indeed, dielectric measurements on powder and single-crystal forms of 1 showed that both the real (ε1) and imaginary (ε2) parts of the dielectric constant were enhanced above ∼360 K at 1 MHz with a Debye-type dielectric relaxation, confirming that 1 underwent a pendulum fluctuation induced by the external electric field.

Graphical abstract: Dielectric response of 1,1-difluorosumanene caused by an in-plane motion

Supplementary files

Article information

Article type
Research Article
Submitted
17 vlj 2022
Accepted
08 tra 2022
First published
09 tra 2022

Mater. Chem. Front., 2022,6, 1752-1758

Dielectric response of 1,1-difluorosumanene caused by an in-plane motion

M. Li, J. Wu, K. Sambe, Y. Yakiyama, T. Akutagawa, T. Kajitani, T. Fukushima, K. Matsuda and H. Sakurai, Mater. Chem. Front., 2022, 6, 1752 DOI: 10.1039/D2QM00134A

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