Researcher Information

Takanori Suzuki


From Hokkaido to Top Organic Chemistry in the World

Department of Chemistry, Organic and Biological Chemistry


Studies on Dynamic Redox Systems: Construction of Record-breaking Strained Compounds and Development of Unimolecular Memory

FieldStructural Organic Chemistry, Organic Chemistry, Physical Organic Chemistry
KeywordHighly strained compounds, Dynamic Redox systems, Electrochromism, Mechanochromism, Dication, Hyper covalent bond

Introduction of Research

The carbon–carbon covalent bond is one of the most basic concept in organic chemistry. Bond length, bond angle, and torsion angle among carbon atoms are nearly constant on the basis of their hybrid orbitals. On the other hand, highly strained hydrocarbons such as sterically-congested and/or curved polycyclic aromatic hydrocarbons as well as cyclic π-conjugated molecules have attracted much attention with regard to their characteristic features. We focused on two types of redox-active molecules with a extremely elongated C-C single bond (Hyper covalent bond with a bond length beyond 1.8 Å) or a strained double bond, for which unique electrochromic behavior was observed upon oxidation to give deeply colored cationic species.

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Representative Achievements

Switching of Redox Properties Triggered by a Thermal Equilibrium between Closed-shell Folded and Open-shell Twisted Species
Y. Ishigaki, T. Hashimoto, K. Sugawara, S. Suzuki, T. Suzuki
Angew. Chem. Int. Ed., in press.
Hexaarylbutadiene: a versatile scaffold with tunable redox properties towards organic near-infrared electrochromic material
Y. Ishigaki, T. Harimoto, K. Sugimoto, L. Wu, W. Zeng, D. Ye, T. Suzuki
Chem. Asian J. 2020, 15, 1147-1155.
Photo- and Thermal Interconversion of Multiconfigurational Strained Hydrocarbons Exhibiting Completely Switchable Oxidation to Stable Dicationic Dyes
Y. Ishigaki, Y. Hayashi, T. Suzuki
J. Am. Chem. Soc. 2019, 141, 18293-18300.
Two-way Chromic Systems Based on Tetraarylanthraquinodimethanes: Electrochromism in Solution and Mechanofluorochromism in a Solid State
Y. Ishigaki, K. Sugawara, M. Yoshida, M. Kato, T. Suzuki
Bull. Chem. Soc. Jpn. 2019, 92, 1211-1217.
Longest C–C Single Bond among Neutral Hydrocarbons with a Bond Length beyond 1.8 Å
Y. Ishigaki, T. Shimajiri, T. Takeda, R. Katoono, T. Suzuki
Chem 2018, 4, 795-806.

Related industries

Functional Materials, Molecular Device
Academic degreePh.D.
Academic background1984 B.S. Department of Chemistry, Faculty of Science, Tohoku University
1986 M.S. Department of Chemistry, Graduate School of Science, Tohoku University
1988 Ph.D. Department of Chemistry, Graduate School of Science, Tohoku University
1988-1989 JSPS Research Fellow (PD), Tohoku University
1989-1994 Assistant Professor, Department of Chemistry, Faculty of Science, Tohoku University
1995-2002 Associate Professor Department of Chemistry, Faculty of Science, Hokkaido University
2002- Professor, Department of Chemistry, Faculty of Science, Hokkaido University
Affiliated academic societyThe Chemical Society of Japan, The Society of Physical Organic Chemistry, Japan, The Society of Synthetic Organic Chemistry, Japan
Room addressScience Building 6 #6-504