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Yamaguchi Lab
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The lab synthesizes metal complexes that link metal ions together and brings out new functions from them.
AboutAbout the lab
Metal complexes: the chemistry of every element
The Yamaguchi Lab synthesizes metal complexes made of metal ions and ligands and investigates their functions.
Coordination chemistry deals with a wide variety of metallic and nonmetallic elements, so it is called the "chemistry of all elements," and because it spans everything from fundamental science to applications, it is also called the "crossroads of chemistry."
The properties of a metal complex can be tuned by changing the central metal ion or the ligands, and when many complexes are assembled together, functions appear that a single unit cannot produce.
For example, in the case of luminescent materials, understanding the mechanism of light emission shows how to achieve even higher performance.
Key terms
- Metal complex
- A compound formed when molecules or ions called ligands bind around a metal ion
- Ligand
- A molecule or ion that binds to a metal ion by donating an electron pair. It greatly influences the properties of the complex
- Mixed-valence state
- A state in which metal ions of the same element exist in different oxidation states within a single compound
ResearchResearch themes
The lab works on assembled metal complexes containing multiple metal ions, especially complexes with a high number of metal centers whose molecular size reaches the nanometer scale. Focusing on synthetic methods that create new framework structures, the lab studies functions such as mixed-valence states, electron transfer, and luminescence.
*Illustrative imageDendrimers of trinuclear ruthenium complexes
Trinuclear ruthenium complexes show multiple reversible redox steps in solution. Because the redox potential can be shifted to some extent by changing the ligands or the bridging carboxylic acids, the lab combined three types of units with different potentials to build a decamer in which electrons are gathered at the central unit.
*Illustrative imageCoordination polymers showing mixed valence
Coordination polymers (also called MOFs), made of metal ions and bridging ligands, show properties that simple mononuclear complexes do not have. The lab synthesizes them using redox-active bridging ligands and metal ions so that mixed-valence states appear, and develops their functions.
*Illustrative imageComplexes with direct metal–metal bonds
The lab studies how to assemble polynuclear complexes that have direct covalent bonds between metal atoms.
MembersFaculty
The members of the Yamaguchi Lab are faculty and master's students.As of 2026
- ProfessorTadashi Yamaguchi
VoicesStudent voices
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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: “Chloro complexes of transition metals” Leiem / CC BY-SA 4.0 (cropped)
- Dendrimers of trinuclear ruthenium complexes: “Ruthenium PNN pincer complex 3D skeletal” Jynto / CC0 (cropped)
- Coordination polymers showing mixed valence: “Pigment Berliner Blau” Saalebaer / CC0 (cropped)
- Complexes with direct metal–metal bonds: “Ruthenium crystals” Periodictableru / CC BY 3.0 (cropped)
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