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Isotope Chemistry Lab
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The lab studies isotope chemistry, exploring radioactive elements through coordination chemistry.
AboutAbout the lab
Exploring the world of radioactive elements, built on coordination chemistry.
The Isotope Chemistry Lab builds on research in coordination chemistry and studies a wide range of metal elements, including radioactive elements.
The lab works on synthesizing metal complexes that emit radiation and light, actinide chemistry, and developing chemical separation methods for elements such as astatine for nuclear medicine therapy.
Its research themes also include the behavior of radioactive materials in the environment and analytical chemistry using muonic atoms.
The lab is located in the Toyonaka Branch of the Radioisotope Research Center on Toyonaka Campus, and lab tours are held at any time for undergraduate, master's, and doctoral students alike.
Key terms
- Metal complex
- A compound in which a metal is bound to ligands. This lab synthesizes them with metals that include radioactive elements.
- Actinides
- A group of elements in the f-block of the periodic table, all of which are radioactive.
- Chelating ligand
- A ligand that stably chelates a metal ion. This lab is working on synthesizing ones that suit radium.
NewsLab news
A master's student received an Outstanding Student Presentation Award at APSORC (2025)
A doctoral student received the BCSJ Award at the Coordination Chemistry Young Researchers' Meeting
A paper by Prof. Yoshimura and colleagues was published in Zeitschrift für Anorganische und Allgemeine Chemie
A paper by Prof. Yoshimura and colleagues was published in Inorganic Chemistry
ResearchResearch themes
The Isotope Chemistry Lab builds on coordination-chemistry-based research and studies a wide range of metal elements, including radioactive elements. Its main pillars are synthetic chemistry, actinide coordination chemistry, development of chemical separation methods for astatine and other elements for nuclear medicine therapy, the behavior of radioactive materials in the environment, and analytical chemistry using muonic atoms.
*Illustrative imageLuminescent rhenium and technetium complexes
The lab synthesizes new technetium and rhenium complexes that can be imaged with both radiation and visible light, and studies their properties. It has also succeeded in synthesizing metal complexes whose emission color and intensity change with pH.
*Illustrative imageLigand synthesis for diagnostic and therapeutic agents
Therapeutic agents using radium-223 are used clinically, but radium has an extremely large ionic radius, and there is no chelating ligand that fits it. In addition to synthesizing ligands that stably chelate radium, the lab also studies ligands for lanthanides and actinium.
*Illustrative imageBattery materials studied with radioisotopes
In vanadium redox flow batteries, a known challenge is that vanadium ions permeate the separator and lower current efficiency. Using radioactive vanadium-48 as a tracer, the lab evaluates ion-exchange membranes with a method that directly observes permeation through the membrane.
*Illustrative imageRedox chemistry and dynamic behavior of uranium
All actinides are radioactive elements, and in the earlier actinides, f electrons also exist in the outer shell. The lab synthesized two kinds of eight-coordinate complexes containing uranium(IV) and uranium(V), and for the first time isolated and structurally determined the structural isomers of each.
MembersFaculty
The members of the Isotope Chemistry Lab are the faculty, doctoral, master's, and undergraduate students, and administrative assistants.As of 2026
- ProfessorTakashi Yoshimura
- Associate ProfessorKenji Shirasaki
- Associate ProfessorKazuhiro Ooe
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Radio-Chemist closing a hot cell to proect themselves from radiation” Talzir / CC BY-SA 4.0 (cropped)
- Luminescent rhenium and technetium complexes: “Technetium-sample” MARCO CARDIN / CC BY-SA 4.0 (cropped)
- Ligand synthesis for diagnostic and therapeutic agents: “Radiopharmaceuticals” National Cancer Institute (NCI) / Public domain (cropped)
- Battery materials studied with radioisotopes: “Vanadium Redox flow battery” Radiotrefoil / CC BY-SA 4.0 (cropped)
- Redox chemistry and dynamic behavior of uranium: “HEUraniumC” Unspecified / Public domain (cropped)
- Related lab (Bioinorganic Chemistry Lab): “Crystal structure of human hemoglobin in the oxy form” PDB code 2DN1 1.25 a resolution crystal structures of human haemoglobin in the oxy, deoxy and carbonmonoxy forms. Park, S.-Y., Yokoyama, T., Shibayama, N., Shiro, Y., Tame, J.R. (2006) J Mol Biol 360: 690-701 DOI: 10.1016/j.jmb. Image created using JSmol (Javascript) / CC0 (cropped)
- Related lab (Radiochemistry Lab): “Periodic Table Chart with reactive nonmetals” Sandbh / CC BY-SA 4.0 (cropped)
- Related lab (Polymer Reaction Chemistry Lab): “Polypropylene Pellets - DPLA - f7c2fa29d14525ce21219452f4a1a316” Quantum Chemical Corporation / CC BY 4.0 (cropped)
- Related lab (Radiation Biochemistry Lab): “Isotope laboratory at the National Institutes of Health ( )” NIH Image Gallery from Bethesda, Maryland, USA / Public domain (cropped)
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