Researcher Information


Ambitious Special Assistant Professor

Exploring the Properties of Extreme Structures.

Department of Chemistry, Organic and Biological Chemistry


Studies on Highly Strained Compounds with Unusual Ptractural Parameters

FieldStructural Organic Chemistry, Physical Organic Chemistry
KeywordLong bond, Highly strained compounds

Introduction of Research

Compounds that are difficult to synthesize and/or easy to decompose in ambient conditions may show interesting properties.
For example, C-C single bond is usually rigid and robust, and its elongation beyond 1.8 Å has been considered impossible .
On the other hand, based on "intramolecular core-shell structure," we succeeded in the first preparation of the compounds with a C-C single bond beyond 1.8 Å, which has been regarded as a boundary between bonded and non-bonded states.
In addition, we also discovered that such a long and weak C-C single bond has a unique "flexibility" that can expand and contract upon slight external stimuli.
Now, I am focusing on not only chemical bonds but also organic π-conjugated systems to elucidate unique chemical phenomena in extreme structures through experimental and theoretical studies.

Representative Achievements

Expandability of the Covalent Bond: A New Facet Discovered in Extremely Long Csp3-Csp3 Single Bonds.
Y. Ishigaki, Y. Uchimura, T. Shimajiri, T. Suzuki
Bull. Chem. Soc. Jpn. 2021, 94, 1385-1393.
Flexible C–C Bonds: Reversible Expansion, Contraction, Formation, and Scission of Extremely Elongated Single Bonds.
T. Shimajiri, T. Suzuki, Y. Ishigaki
Angew. Chem. Int. Ed. 2020, 59, 22252-22257.
Expandability of a long C-O bond by a scissor effect in acenaphthofuran.
Y. Uchimura, T. Shimajiri, Y. Ishigaki, R. Katoono, T. Suzuki
Chem. Commun. 2018, 54, 10300-10303.
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, Organic Dye
Academic degreePh. D
Room addressScience Building 6, 6-509