Researcher Information

SUGAWARA Kazuma

Specially Appointed Assistant Professor

Exploring the mechanisms of function through molecular structure and assembly

Department of Chemistry, Organic and Biological Chemistry

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Theme

Creation of Functional Organic Materials Based on Molecular Structure and Assembly

FieldStructure Organic Chemistry, Organic Chemistry, Physical Organic Chemistry
KeywordHighly strained compounds, Redox systems, Chromism, Crystalline polymorphs, High-Pressure

Introduction of Research

Organic molecules can exhibit different properties even when they have the same molecular structure, depending on how they are arranged in the crystalline state. This phenomenon is known as crystal polymorphism and can have a significant impact on various functions, including luminescence, electronic properties, and responses to external stimuli.
Our research focuses on crystal polymorphism, with particular attention not only to how molecules are arranged in crystals, but also to how the molecular structure itself changes depending on the crystal environment. By understanding the mechanisms of functional expression from both molecular arrangement and molecular structure, we aim to control the functions of organic molecules in the crystalline state.
By combining molecular design and synthesis, crystal structure analysis, and property evaluation, we seek to clarify the relationships between structural changes and functional changes induced by crystal polymorphism, ultimately leading to the creation of new functional organic materials.

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Molecules Exhibiting Diverse Colors Depending on Their Conformations

Representative Achievements

Isolation of a Transition-State Geometry via Intermolecular Stabilization in the Solid State.
Y. Ishigaki, S. Kikuchi, T. Tadokoro, K. Sugawara, T. Suzuki
Org. Lett. 2025, 27, 9002-9006.
Thermal Equilibrium between Quinoid/Biradical Forms Enhancing Electrochemical Amphotericity.
Y. Ishigaki, S. Mizuno, K. Sugawara, T. Hashimoto, S. Suzuki, T. Suzuki
Chem. Eur. J. 2024, 30, e202400916.
On-Surface Synthesis of Multiple Cu Atom-Bridged Organometallic Oligomers.
K. Sun, K. Sugawara, A. Lyalin, Y. Ishigaki, K. Uosaki, O. Custance, T. Taketsugu, T. Suzuki, S. Kawai
ACS Nano 2023, 17, 24355-24362.
Exceptionally flexible quinodimethanes with multiple conformations: polymorph-dependent colour tone and emission of crystals.
K. Sugawara, T. Ono, Y. Yano, T. Suzuki, Y. Ishigaki
Mater. Chem. Front. 2023, 7, 1591-1598. (Selected as the Back Cover, Chem-Station 第522回スポットライトリサーチ)
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. (Selected Paper)

Related industries

Functional Materials, Molecular Device, Optical Element
Academic degreePh. D.
Academic background2018 B.S. Department of Chemistry, Faculty of Science, Hokkaido University
2019 M.S. Division of Chemical Sciences and Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University
2022 Ph.D. Division of Chemical Sciences and Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University
2023-2026 SHIONOGI & CO., LTD.
2026- Specially Appointed Assistant Professor, Department of Chemistry, Faculty of Science, Hokkaido University
Room addressScience Building 6 6-510
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