Professor Takahiko Kojima

Professor Takahiko Kojima
Department of Chemistry
University of Tsukuba, Japan
Abstract

Selective Chemical Conversion Using Metal Complexes Based on Proton-Coupled Electron Transfer

Selective conversion of abundant natural feedstock and C1 resources such as CH4 and CO2 to useful compounds has been recognized to be one of most important tasks of chemistry.1 In this seminar, catalytic oxidation of C-H bonds by high-valent metal-oxo complexes and photocatalytic CO2 reduction will be presented as main topics. After briefly introducing our effort in oxidation reactions using Ru complexes based on proton- coupled electron transfer (PCET),2 selective CH4 oxidation to CH3OH using Fe complexes will be also described under a “catch-and-release” strategy in aqueous medium.3,4 As for CO2 reduction, inspired by a Ni-containing enzyme, highly selective and efficient conversion of CO2 to CO has been achieved using Ni complexes as catalysts under visible-light irradiation.5,6 In addition, a self-photosensitizing dinuclear Ru catalyst will be introduced as a good catalyst for almost stoichiometric CO2-to-CO conversion.7 In this presentation, it will be emphasized that appropriate arrangement of second coordination sphere of metal complexes should be important for achieving selective and efficient chemical conversion.

Takahiko Kojima

Takahiko Kojima was born in Nagoya, Japan, in 1962 and earned a bachelor’s degree and Ph.D. degree in coordination chemistry under the supervision of Prof. Sadao Yoshikawa in 1986 and Prof. Masanobu Hidai in 1991 at The University of Tokyo, respectively. After working as a postdoctoral associate in Prof. Lawrence Que, Jr.’s group from 1991 to 1993 at University of Minnesota in USA, he became an assistant professor of Chemistry Department in Kyushu University in 1994. He moved to Department of Material and Life Science, Osaka University, as an associate professor of Prof. Shunichi Fukuzumi’s group in 2005. Since 2008, he has been serving as a full professor of Department of Chemistry, University of Tsukuba. He was awarded the Chemical Society of Japan Award for Creative work for 2019. His research interest includes proton-coupled electron transfer in metal complexes, oxidation catalysis, artificial photosynthesis, redox and photochemical reactivity of nonplanar porphyrinoids.

References

  1. T. Ishizuka, T. Kojima, Acc. Chem. Res. 2024, ASAP.
  2. T. Kojima, Bull. Chem. Soc. Jpn. 2020, 93, 1571-1582.
  3. H. Fujisaki, T. Ishizuka, H. Kotani, Y. Shiota, K. Yoshizawa, T. Kojima, Nature 2023, 616, 476-481.
  4. H. Fujisaki, T. Ishizuka, H. Kotani, T. Kojima, ACS Catal. 2024, 14, 2609-2619.
  5. D. Hong, Y. Tsukakoshi, H. Kotani, T. Ishizuka, T. Kojima, J. Am. Chem. Soc. 2017,139, 6538-6541.
  6. D. Hong, T. Kawanishi, Y. Tsukakoshi, H. Kotani, T. Ishizuka, T. Kojima, J. Am. Chem. Soc. 2019, 141, 20309-20317.
  7. T. Ishizuka, A. Hosokawa, T. Kawanishi, H. Kotani, Y. Zhi, T. Kojima, J. Am.Chem. Soc. 2023, 145, 23196-23204.


Hosted by Professor Jessica Hoover

Category
Start date
Friday, Aug. 30, 2024, 4:30 p.m.
End date
Friday, Aug. 30, 2024, 6 p.m.
Location

Location Change!   231 Smith Hall
Zoom Link

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