World's Best Scientists 2026 revealed!
Kei Ohkubo

Kei Ohkubo

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Chemistry
Japan
2026

D-Index & Metrics

Chemistry

D-Index
95
Citations
28263
World Ranking
1654
National Ranking
80

Research.com Recognitions

  • 2026 - Research.com Chemistry in Japan Leader Award
  • 2025 - Research.com Chemistry in Japan Leader Award
  • 2022 - Research.com Chemistry in Japan Leader Award

Overview

Kei Ohkubo is affiliated with Osaka University in Japan and has a research focus primarily in the fields of Chemistry and Materials Science. Their scholarly work encompasses various subfields, including Organic Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Biomedical Engineering, and Biophysics.

The scientist's research covers several specialized topics, notably:

  • Free Radicals and Antioxidants
  • Radical Photochemical Reactions
  • Oxidative Organic Chemistry Reactions
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Luminescence and Fluorescent Materials
  • Sulfur-Based Synthesis Techniques

Key recent publications illustrate the scope of this work:

  • "Fluorescein-Based Type I Supramolecular Photosensitizer via Induction of Charge Separation by Self-Assembly," 2022, JACS Au
  • "Acridinium salts as photoredox organocatalysts for photomediated cationic RAFT and DT polymerizations of vinyl ethers," 2021, Polymer Chemistry
  • "Chlorine-radical-mediated C-H oxygenation reaction under light irradiation," 2023, Chemical Communications
  • "Amphiphilic Rhodamine Nano-assembly as a Type I Supramolecular Photosensitizer for Photodynamic Therapy," 2022, ACS Applied Nano Materials
  • "9-Cyano-10-methoxycarbonylanthracene as a Visible Organic Photoredox Catalyst in the Two-Molecule Photoredox System," 2022, The Journal of Organic Chemistry

Frequently publishing in venues such as The Cambridge Structural Database and Chemical Communications, Kei Ohkubo also has multiple articles in Free Radical Biology and Medicine, Antioxidants, and ECS Meeting Abstracts.

Their collaborative network includes frequent coauthors such as Ikuo Nakanishi, Yoshimi Shoji, Shunichi Fukuzumi, Haruyasu Asahara, and Yuki Itabashi, reflecting a range of joint research engagements across related chemical and photochemical disciplines.

Best Publications

  • Electron-transfer state of 9-mesityl-10-methylacridinium ion with a much longer lifetime and higher energy than that of the natural photosynthetic reaction center.

    Shunichi Fukuzumi;Hiroaki Kotani;Kei Ohkubo;Seiji Ogo

  • Organic synthetic transformations using organic dyes as photoredox catalysts

    Shunichi Fukuzumi;Kei Ohkubo

  • Long-lived charge separation and applications in artificial photosynthesis.

    Shunichi Fukuzumi;Kei Ohkubo;Tomoyoshi Suenobu

  • Rational Principles for Modulating Fluorescence Properties of Fluorescein

    Tasuku Ueno;Yasuteru Urano;Ken-Ichi Setsukinai;Hideo Takakusa

  • Rational design principle for modulating fluorescence properties of fluorescein-based probes by photoinduced electron transfer.

    Tetsuo Miura;Yasuteru Urano;Kumi Tanaka;Tetsuo Nagano

  • Charge separation in a nonfluorescent donor-acceptor dyad derived from boron dipyrromethene dye, leading to photocurrent generation.

    Shigeki Hattori;Kei Ohkubo;Yasuteru Urano;Hisato Sunahara

  • Visible-Light-Induced Oxygenation of Benzene by the Triplet Excited State of 2,3-Dichloro-5,6-dicyano-p-benzoquinone

    Kei Ohkubo;Atsushi Fujimoto;Shunichi Fukuzumi;Shunichi Fukuzumi

  • Photocatalytic Oxygenation of Anthracenes and Olefins with Dioxygen via Selective Radical Coupling Using 9-Mesityl-10-methylacridinium Ion as an Effective Electron-Transfer Photocatalyst

    Hiroaki Kotani;Kei Ohkubo;Shunichi Fukuzumi

  • Simultaneous production of p-tolualdehyde and hydrogen peroxide in photocatalytic oxygenation of p-xylene and reduction of oxygen with 9-mesityl-10-methylacridinium ion derivatives

    Kei Ohkubo;Kentaro Mizushima;Ryosuke Iwata;Kazunori Souma

  • Quantitative Evaluation of Lewis Acidity of Metal Ions Derived from the g Values of ESR Spectra of Superoxide: Metal Ion Complexes in Relation to the Promoting Effects in Electron Transfer Reactions

    Shunichi Fukuzumi;Kei Ohkubo

  • Production of an Ultra‐Long‐Lived Charge‐Separated State in a Zinc Chlorin–C60 Dyad by One‐Step Photoinduced Electron Transfer

    Kei Ohkubo;Hiroaki Kotani;Jianguo Shao;Zhongping Ou

  • Photocatalytic Reduction of Low Concentration of CO2.

    Takuya Nakajima;Yusuke Tamaki;Kazuki Ueno;Eishiro Kato

  • Phosphorescent Sensor for Biological Mobile Zinc

    Youngmin You;Sumin Lee;Taehee Kim;Kei Ohkubo

  • Catalytic mechanisms of hydrogen evolution with homogeneous and heterogeneous catalysts

    Shunichi Fukuzumi;Shunichi Fukuzumi;Yusuke Yamada;Tomoyoshi Suenobu;Kei Ohkubo

  • Direct Oxygenation of Benzene to Phenol Using Quinolinium Ions as Homogeneous Photocatalysts

    Kei Ohkubo;Takaki Kobayashi;Shunichi Fukuzumi;Shunichi Fukuzumi

  • Photoalkylation of 10-Alkylacridinium Ion via a Charge-Shift Type of Photoinduced Electron Transfer Controlled by Solvent Polarity

    Shunichi Fukuzumi;Kei Ohkubo;Tomoyoshi Suenobu;Kouta Kato

  • Oxidation Mechanism of Phenols by Dicopper−Dioxygen (Cu2/O2) Complexes

    Takao Osako;Kei Ohkubo;Masayasu Taki;Yoshimitsu Tachi

  • Ultrafast Photodynamics of Exciplex Formation and Photoinduced Electron Transfer in Porphyrin−Fullerene Dyads Linked at Close Proximity

    Nikolai V. Tkachenko;Helge Lemmetyinen;Junko Sonoda;Kei Ohkubo

  • Photochemical and electrochemical properties of zinc chlorin-C60 dyad as compared to corresponding free-base chlorin-C60, free-base porphyrin-C60, and zinc porphyrin-C60 dyads.

    Shunichi Fukuzumi;Kei Ohkubo;Hiroshi Imahori;Jianguo Shao

  • Driving force dependence of intermolecular electron-transfer reactions of fullerenes.

    Shunichi Fukuzumi;Kei Ohkubo;Hiroshi Imahori;Dirk M. Guldi

  • Corrole-fullerene dyads: formation of long-lived charge-separated states in nonpolar solvents.

    Francis D'Souza;Raghu Chitta;Kei Ohkubo;Mariusz Tasior

Frequent Co-Authors

Shunichi Fukuzumi
Shunichi Fukuzumi Osaka University
Takahiko Kojima
Takahiko Kojima University of Tsukuba
Karl M. Kadish
Karl M. Kadish University of Houston
Jonathan L. Sessler
Jonathan L. Sessler The University of Texas at Austin
Taku Hasobe
Taku Hasobe Keio University
Francis D'Souza
Francis D'Souza University of North Texas
Maxwell J. Crossley
Maxwell J. Crossley University of Sydney
Yusuke Yamada
Yusuke Yamada Osaka Metropolitan University
Wonwoo Nam
Wonwoo Nam Ewha Womans University
Tomoyoshi Suenobu
Tomoyoshi Suenobu Osaka University

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